Data Provider Groups | Data Provider Elements

Astrogator Pass Data

Calc Object values at the end of each pass break. Each Calc Object contained in the Component Browser is available for use, including user defined Calc Objects. The Calc Objects listed here are representative.

Available for these objects: Satellite

Type: Time-varying data. Intended to be used only with elements from this same data provider.

Availability: Reports | Graphs | Dynamic Displays | Strip Charts

Data Provider Groups

NameDescription
TopTime measures.
AccessAn Access calculation object that computes access between two objects.
Cartesian ElemsCalc Objects for the ephemeris of the object, expressed in Cartesian components. Each Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Cartesian STMThe 6x6 State Transition Matrix (STM) for the Cartesian position and velocity. The STM describes the effect of position-velocity perturbations made at the start of propagation on the position-velocity state at the reported time. The coordinate system is a property of the calc objects. Updated data is generated only for segments with a propagator that has a State Transition Matrix propagator function.
ConstantsConstant values used in astrodynamic calculations.
Curvilinear Relative MotionCalc Objects for relative ephemeris between the satellite and reference satellite, expressed in curvilinear coordinates. The relative ephemeris is computed using a reference ellipse that is defined as being the instantaneous keplerian orbit for either the satellite or reference satellite. Crosstrack is the (signed) distance between an object's position and the plane of the reference ellipse. Crossrange is the (signed) closest distance to the reference ellipse from the projection of an object's position into the plane of the reference ellipse. This closest point on the reference ellipse is called the downrange position of the object. Downrange is the (signed) distance along the reference ellipse between two downrange positions. See Also Relative Motion.
Delaunay ElemsA set of canonical angle-action variables commonly used in general perturbation theories. An orbit is defined by a set of conjugate angle-action pairs.
EnvironmentCalc Objects for the satellite environment.
Equinoctial ElemsCalc Objects for the ephemeris of the object, expressed in equinoctial elements. Each Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is osculating. Each Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
FormationCalc Objects for relative motion and close approaches with respect to the master satellite or a specified vehicle. See also Relative Motion. The close approach X axis is the unit vector in the direction of the cross product of the relative velocity vector with the orbit momentum vector of the reference vehicle. The close approach Y axis is the unit vector in the direction of the cross product of the X axis and the relative velocity vector. The close approach plane is the plane spanned by the X and Y axes. The close approach vector is the relative position vector from the reference vehicle.
GeoStationaryCalc Objects that are useful for station keeping of geostationary satellites. Each Calc Object allows a choice of a central body. The default is Earth.
GeodeticCalc Objects for the ephemeris of the object, expressed in LLA elements. Each Calc Object allows a choice of a central body. The default is Earth.
Ground TrackCalc Objects for maintaining a repeating ground track.
Keplerian ElemsCalc Objects for the ephemeris of the object, expressed in keplerian (i.e., instantaneous two-body) elements. Each Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is osculating.
ManeuverManeuver related Calc Objects.
MathUsed to perform functions on other Calc Objects.
Mean ElemsCalc Objects for the ephemeris of the object, expressed in Keplerian elements. Each Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is Kozai-Izsak mean elements. The mean elements are computed using mean element theory (not simply a numerical average of the element over a period), considering only gravity perturbations (J2 and for some theories J3 through J5).
MultiBodyUsed for targeting a different central body. See also B-plane targeting under Astrogator help.
Other OrbitMiscellaneous Calc Objects.
PowerCalc Objects that compute power.
Relative MotionCalc Objects for relative ephemeris. The relative ephemeris is computed with respect to two rotating frames, the RIC (Radial, In-Track, Cross-Track) frame and the NTC (Normal, Tangential, and Cross-Track) frames, that are defined using the primary's ephemeris. Cross-track refers to the direction perpendicular to the position and inertial velocity; in-track refers to the direction perpendicular to both the radial and cross-track (positive in the direction of motion); tangential refers to the direction along the velocity vector; and normal refers to the direction perpendicular to the velocity and cross-track directions (positive outward along radial). Each Calc Object allows a choice of a central body. The default is Earth. See Also Formation.
SEETCalc Objects utilizing computations provided by SEET.
STM EigenvaluesThe eigenvalues of the 6x6 cartesian State Transition Matrix (STM). The STM describes the effect of position-velocity perturbations made at the start of propagation on the position-velocity state at the reported time. The coordinate system is a property of the calc objects. Updated data is generated only for segments with a propagator that has a State Transition Matrix propagator function. When accessing after the MCS has been run, the eigenvalues are sorted for consistency between ephemeris points. When accessing during an MCS run, the eigenvalues are sorted by absolute value of the real part.
STM EigenvectorsThe eigenvectors of the 6x6 cartesian State Transition Matrix (STM). The STM describes the effect of position-velocity perturbations made at the start of propagation on the position-velocity state at the reported time. The coordinate system is a property of the calc objects. Updated data is generated only for segments with a propagator that has a State Transition Matrix propagator function. When accessing after the MCS has been run, the eigenvalues are sorted for consistency between ephemeris points. When accessing during an MCS run, the eigenvalues are sorted by absolute value of the real part. The first eigenvector then corresponds to the first eigenvalue, etc.
ScalarScalar calculation component.
ScriptsValues from Astrogator plugin scripts.
Spacecraft PropertiesIncluded are Drag, Radiation Pressure, and Solar Radiation Pressure coefficient and area values of a spacecraft. You can use these objects to report how a propagator plugin changes these values over time. When the value of one these objects changes, Astrogator applies the new value to subsequent propagation steps and segments in the MCS.

For built-in models that introduce time-varying areas and coefficients, namely the Variable Area and N-Plate models, the Drag and SRP calculation objects take on particular meanings as described below.

Variable Area Drag and SRP models:

The DragArea and SRPArea calculation objects reflect the associated areas used for a given time step in the ephemeris as prescribed by the corresponding file(s). Behavior of the Cd and Cr coefficients is unchanged from prior patterns by these models. Astrogator does not back-compute any quantities from the Variable Area Drag and SRP models; it keeps the values for area as per the original input.

N-Plate Drag:

For reporting purposes, Astrogator computes the DragArea calculation object by taking the "velocity-facing" area at a particular time step. Astrogator back-computes the Cd coefficient calculation object from the acceleration produced by the model only in the direction opposed to the velocity. Although such accounting generally captures the majority of the associated drag effects, neither of these scalar parameters completely reflect the contribution of the N-Plate Drag model to the total acceleration as experienced by the spacecraft under the numerical propagation. Astrogator neglects the perpendicular components in this reporting process.

N-Plate SRP:

Astrogator produces the SRPArea calculation object as the "Sun-facing" area for a particular ephemeris point. It back-computes the Cr coefficient calculation object only from the acceleration in the direction opposite to the Sun. Such accounting for reporting purposes in these scalar parameters does not capture the entire vector acceleration experienced by the spacecraft during numerical propagation.

Unlike the case of a plugin changing the values, the various drag and coefficient values for these built-in models are applicable only for segments in which these models are active. Take the case, for example, where Astrogator propagates three subsequent segments in order. The first and third segments both use the DragArea parameter defined at the MCS level in some Initial State (or Update, etc.) segment. The second segment, between the first and third segments, uses the Variable Area Drag model. No plugins or other methods for changing the DragArea parameter are employed. In such a case, Astrogator will apply the constant MCS-level DragArea value to the first segment. For the second segment, it will use the Variable Area Drag model and report a varying value for DragArea. For the third segment, it will revert to the value of DragArea used in the first segment regardless of the DragArea value in effect at the end of the second segment.

The behavior described in the Variable Area Drag model example — reverting parameters when the associated model is not employed — is consistent with how Astrogator reports all of the noted calculation objects for each of the built-in time-varying models described above. It is also consistent with the time of effect for the underlying models when Astrogator computes the full-vector accelerations consistent with constituent parameters (plates, coefficients, etc.). To have any value set by one of these models to persist into a subsequent segment, introduce an Update segment as appropriate.

The effective drag and SRP area, as well as the effective Cd and Cr values, will be zero when the satellite altitude is outside the bounds of the density model, nominally -100 km to 2500 km. The effective Cr is also zero when the satellite is in shadow.

Spherical ElemsCalc Objects for the ephemeris of the object, expressed in spherical elements.
Target VectorData for incoming and outgoing asymptotes as well as C3 energy.
TimeTime related Calc Objects.
UserValuesUser Variable related Calc Objects.
VectorVector-related Calc Objects.
Segment DataProperties of each MCS segment in the Astrogator satellite.

Data Provider Elements

Top
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
EpochDateReal Number or TextThe reference epoch for the object.

Access
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
AccessUnitlessReal NumberIndicates whether there is access between two objects. 1 = access, and 0 = no access.

Cartesian Elems
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
VxRateReal NumberX Cartesian component of velocity.
VyRateReal NumberY Cartesian component of velocity.
VzRateReal NumberZ Cartesian component of velocity.
XDistanceReal NumberThe X component of the position vector in the coordinate system specified by this Calc Object.
YDistanceReal NumberThe Y component of the position vector in the coordinate system specified by this Calc Object.
ZDistanceReal NumberThe Z component of the position vector in the coordinate system specified by this Calc Object.

Cartesian STM
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
STMPosXPosXUnitlessReal NumberState transition function: delta(PosX,tf) = [this value] * delta(PosX,ti).
STMPosXPosYUnitlessReal NumberState transition function: delta(PosX,tf) = [this value] * delta(PosY,ti).
STMPosXPosZUnitlessReal NumberState transition function: delta(PosX,tf) = [this value] * delta(PosZ,ti).
STMPosXVelXUnitlessReal NumberState transition function: delta(PosX,tf) = [this value] * delta(VelX,ti).
STMPosXVelYUnitlessReal NumberState transition function: delta(PosX,tf) = [this value] * delta(VelY,ti).
STMPosXVelZUnitlessReal NumberState transition function: delta(PosX,tf) = [this value] * delta(VelZ,ti).
STMPosYPosXUnitlessReal NumberState transition function: delta(PosY,tf) = [this value] * delta(PosX,ti).
STMPosYPosYUnitlessReal NumberState transition function: delta(PosY,tf) = [this value] * delta(PosY,ti).
STMPosYPosZUnitlessReal NumberState transition function: delta(PosY,tf) = [this value] * delta(PosZ,ti).
STMPosYVelXUnitlessReal NumberState transition function: delta(PosY,tf) = [this value] * delta(VelX,ti).
STMPosYVelYUnitlessReal NumberState transition function: delta(PosY,tf) = [this value] * delta(VelY,ti).
STMPosYVelZUnitlessReal NumberState transition function: delta(PosY,tf) = [this value] * delta(VelZ,ti).
STMPosZPosXUnitlessReal NumberState transition function: delta(PosZ,tf) = [this value] * delta(PosX,ti).
STMPosZPosYUnitlessReal NumberState transition function: delta(PosZ,tf) = [this value] * delta(PosY,ti).
STMPosZPosZUnitlessReal NumberState transition function: delta(PosZ,tf) = [this value] * delta(PosZ,ti).
STMPosZVelXUnitlessReal NumberState transition function: delta(PosZ,tf) = [this value] * delta(VelX,ti).
STMPosZVelYUnitlessReal NumberState transition function: delta(PosZ,tf) = [this value] * delta(VelY,ti).
STMPosZVelZUnitlessReal NumberState transition function: delta(PosZ,tf) = [this value] * delta(VelZ,ti).
STMVelXPosXUnitlessReal NumberState transition function: delta(VelX,tf) = [this value] * delta(PosX,ti).
STMVelXPosYUnitlessReal NumberState transition function: delta(VelX,tf) = [this value] * delta(PosY,ti).
STMVelXPosZUnitlessReal NumberState transition function: delta(VelX,tf) = [this value] * delta(PosZ,ti).
STMVelXVelXUnitlessReal NumberState transition function: delta(VelX,tf) = [this value] * delta(VelX,ti).
STMVelXVelYUnitlessReal NumberState transition function: delta(VelX,tf) = [this value] * delta(VelY,ti).
STMVelXVelZUnitlessReal NumberState transition function: delta(VelX,tf) = [this value] * delta(VelZ,ti).
STMVelYPosXUnitlessReal NumberState transition function: delta(VelY,tf) = [this value] * delta(PosX,ti).
STMVelYPosYUnitlessReal NumberState transition function: delta(VelY,tf) = [this value] * delta(PosY,ti).
STMVelYPosZUnitlessReal NumberState transition function: delta(VelY,tf) = [this value] * delta(PosZ,ti).
STMVelYVelXUnitlessReal NumberState transition function: delta(VelY,tf) = [this value] * delta(VelX,ti).
STMVelYVelYUnitlessReal NumberState transition function: delta(VelY,tf) = [this value] * delta(VelY,ti).
STMVelYVelZUnitlessReal NumberState transition function: delta(VelY,tf) = [this value] * delta(VelZ,ti).
STMVelZPosXUnitlessReal NumberState transition function: delta(VelZ,tf) = [this value] * delta(PosX,ti).
STMVelZPosYUnitlessReal NumberState transition function: delta(VelZ,tf) = [this value] * delta(PosY,ti).
STMVelZPosZUnitlessReal NumberState transition function: delta(VelZ,tf) = [this value] * delta(PosZ,ti).
STMVelZVelXUnitlessReal NumberState transition function: delta(VelZ,tf) = [this value] * delta(VelX,ti).
STMVelZVelYUnitlessReal NumberState transition function: delta(VelZ,tf) = [this value] * delta(VelY,ti).
STMVelZVelZUnitlessReal NumberState transition function: delta(VelZ,tf) = [this value] * delta(VelZ,ti).

Constants
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Gravitational_ParameterGrav ParameterReal NumberGravitational Parameter of a central body.
Gravity_CoefficientUnitlessReal NumberCoefficient value of a gravity field.
PiUnitlessReal NumberThe common mathematical constant consistent with the ratio of a circle's circumference to its diameter.
Reference_RadiusDistanceReal NumberReference radius of a central body.
Speed_of_LightRateReal NumberLight speed.

Curvilinear Relative Motion
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Crossrange_PositionDistanceReal NumberThe crossrange position of location source relative to reference ellipse (i.e., the point on the reference ellipse closest to the point corresponding to the projection of the position into the plane of the reference ellipse). The location source may be specified as being the satellite or the reference satellite. The reference ellipse may be specified as being the instantaneous keplerian ellipse determined from the satellite's or reference satellite's orbit. The sign convention may be specified as being positive or negative when the location source is outside of the reference ellipse.
Crossrange_VelocityRateReal NumberThe time derivative of crossrange position.
Crosstrack_AngleAngleReal Number or TextThe angle between the position of the location source and the plane of the reference ellipse. The location source may be specified as being the satellite or the reference satellite. The reference ellipse may be specified as being the instantaneous keplerian ellipse determined from the satellite's or reference satellite's orbit. The sign convention may be specified as being positive or negative when the position has a positive dot product with the orbit plane normal.
Crosstrack_Angle_RateAngleRateReal NumberThe time derivative of crosstrack angle.
Crosstrack_PositionDistanceReal NumberThe position of location source relative to the plane of the reference ellipse (i.e., the signed perpendicular distance between the position and the plane of the reference ellipse). The location source may be specified as being the satellite or the reference satellite. The reference ellipse may be specified as being the instantaneous keplerian ellipse determined from the satellite's or reference satellite's orbit. The sign convention may be specified as being positive or negative when the position has a positive dot product with the orbit plane normal.
Crosstrack_VelocityRateReal NumberThe time derivative of crosstrack position.
Downrange_AngleAngleReal Number or TextThe relative angle between the downrange position of location source and the downrange position of the satellite being used to define the reference ellipse. The location source may be specified as being the satellite or the reference satellite. The reference ellipse may be specified as being the instantaneous keplerian ellipse determined from the satellite's or reference satellite's orbit. The sign convention may be specified as being positive or negative when the location source is ahead of the downrange position of the satellite being used to define the reference ellipse.
Downrange_Angle_RateAngleRateReal NumberThe time derivative of downrange angle.
Downrange_PositionDistanceReal NumberThe downrange position of location source relative to the downrange position of the satellite being used to define the reference ellipse. The downrange position of an object is the point on the reference ellipse closest to the object. Distance is measured along the the curved path of the reference ellipse. The location source may be specified as being the satellite or the reference satellite. The reference ellipse may be specified as being the instantaneous keplerian ellipse determined from the satellite's or reference satellite's orbit. The sign convention may be specified as being positive or negative when the location source is ahead of the downrange position of the satellite being used to define the reference ellipse.
Downrange_TimeTimeReal NumberThe time offset between the downrange position of location source and the downrange position of the satellite being used to define the reference ellipse, computed using keplerian motion along the reference ellipse. The location source may be specified as being the satellite or the reference satellite. The reference ellipse may be specified as being the instantaneous keplerian ellipse determined from the satellite's or reference satellite's orbit. The sign convention may be specified as being positive or negative when the location source is ahead of the downrange position of the satellite being used to define the reference ellipse.
Downrange_VelocityRateReal NumberThe time derivative of downrange position.

Delaunay Elems
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Delaunay_GArea RateReal NumberThe magnitude of the orbital angular momentum: sqrt (GM * p).
Delaunay_HArea RateReal NumberThe Z component of the orbital angular momentum: G cos(inc).
Delaunay_LArea RateReal Numbersqrt (GM * a).
Semi-latus_RectumDistanceReal NumberThe distance from focus to orbit at true anomaly of 90 degrees.

Environment
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
AtmosDensityDensityReal NumberThe density of the atmosphere. The default is the US Standard Atmosphere, though other models are available.
AtmosPressurePressureReal NumberThe pressure of the atmosphere. The default is the US Standard Atmosphere, though other models are available. Some density models do not compute the pressure, in which case an error condition is returned.
AtmosTemperatureTemperatureReal NumberThe temperature of the atmosphere. The default is the US Standard Atmosphere, though other models are available. Some density models do not compute the temperature, in which case an error condition is returned.

Equinoctial Elems
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Equinoctial_hUnitlessReal Numberh = eccentricity * sin(right_ascension_of_the_ascending_node + argument_of_periapse). Equinoctial elements h and k together describe the shape of the orbit and the location of the periapse.
Equinoctial_kUnitlessReal Numberk = eccentricity * cos(right_ascension_of_the_ascending_node + argument_of_periapse). Equinoctial elements h and k together describe the shape of the orbit and the location of the periapse.
Equinoctial_pUnitlessReal Numberp = tan(inclination/2) * sin(right_ascension_of_the_ascending_node). Equinoctial elements p and q together describe the orientation of the orbit plane. Retrograde orbits have a singularity at zero inclination, and posigrade orbits have a singularity at 180 deg inclination.
Equinoctial_qUnitlessReal Numberq = tan(inclination/2) * cos(right_ascension_of_the_ascending_node). Equinoctial elements p and q together describe the orientation of the orbit plane. Retrograde orbits have a singularity at zero inclination, and posigrade orbits have a singularity at 180 deg inclination.
Mean_LongitudeAngleReal Number or Textmean longitude is the sum: right_ascension_of_the_ascending_node + argument_of_periapse + mean_anomaly. A measure of the location within the orbit.

Formation
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
CloseApproachBearingAngleReal Number or TextThe angle from the relative velocity vector to the reference vehicle. The Calc Object allows a choice of a central body. The default is Earth.
CloseApproachMagnitudeDistanceReal NumberThe magnitude of close approach vector. The value is sqrt(x^2 + y^2). The Calc Object allows a choice of a central body. The default is Earth.
CloseApproachThetaAngleReal Number or TextThe angle from X to close approach vector. The Calc Object allows a choice of a central body. The default is Earth.
CloseApproachXDistanceReal NumberThe X component of close approach vector. The Calc Object allows a choice of a central body. The default is Earth.
CloseApproachYDistanceReal NumberThe Y component of close approach vector. The Calc Object allows a choice of a central body. The default is Earth.
CosineOfCloseApproachBearingUnitlessReal NumberThe cosine of the close approach bearing. The Calc Object allows a choice of a central body. The default is Earth.
RelativeAtAOLTimeReal NumberThe relative value (i.e., difference between the value computed for this satellite and the reference vehicle) of a specified calculation object. The value for the satellite is computed at the current state; the value for the reference is computed at either the previous or next state where the reference vehicle's argument of latitude is the same as the satellite's current value.
RelativeValueTimeReal NumberThe relative value (i.e., difference between the value computed for this satellite and the reference vehicle) of a specified calculation object. Both values are computed at the given epoch.
RelGroundTrackErrorDistanceReal NumberGround track error compared to the reference vehicle. The value for the satellite is computed at the current state; the value for the reference is computed at either the previous or next state where the reference vehicle's argument of latitude is the same as the satellite's current value. The ground track error can be unsigned or signed based on RxV.
Rel_Mean_Arg_of_LatAngleReal Number or TextThe relative mean argument of latitude compared to the reference vehicle.
Rel_Mean_Arg_of_PerigeeAngleReal Number or TextThe relative mean argument of perigee compared to the reference vehicle.
Rel_Mean_EccentricityUnitlessReal NumberThe relative mean eccentricity compared to the reference vehicle.
Rel_Mean_InclinationAngleReal Number or TextThe relative mean inclination compared to the reference vehicle.
Rel_Mean_Mean_AnomalyAngleReal Number or TextThe relative mean mean anomaly compared to the reference vehicle.
Rel_Mean_PeriodTimeReal NumberThe relative mean orbit period compared to the reference vehicle.
Rel_Mean_RAANAngleReal Number or TextThe relative mean RAAN compared to the reference vehicle.
Rel_Mean_Semimajor_AxisDistanceReal NumberThe relative mean semimajor axis compared to the reference vehicle.

GeoStationary
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Longitude_Drift_RateAngleRateReal NumberThe difference between the mean orbital rate and the central body rotation rate. The Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is osculating. The mean orbital rate is computing using the element type and accounting for the effects of J2 of the central body.
Mean_Earth_LongitudeAngleReal Number or TextMean longitude, computed in the True Of Date coordinate system, minus the Greenwich hour angle.

This Calc Object is only valid for the Earth central body.

RectifiedLongitudeAngleReal Number or TextTwo-body rectified longitude with respect to central body. The rectified motion moves nearly uniformally in true anomaly. The value is computed by first determining the two-body orbital elements, re-assigning the true anomaly value to the value of the mean anomaly, computing the cartesian position using these modified elements, and then computing the corresponding longitude from that position.

Geodetic
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
AltitudeDistanceReal NumberThe altitude value (i.e., magnitude of the relative position vector between the object and its detic subpoint).
AltitudeRateRateReal NumberThe rate of change of altitude.
Height_above_terrainDistanceReal NumberThe height above the terrain.
LatitudeAngleReal Number or TextThe detic latitude (i.e., angle between the detic subpoint's surface normal vector and the XY plane).
LatitudeRateAngleRateReal NumberThe rate of change of the detic latitude.
LongitudeAngleReal Number or TextThe detic longitude (i.e., angle from the X-axis locating the projection of the detic subpoint's surface normal vector onto the XY plane.) Longitude increases in the direction found using the right-hand rule about the Z-axis.
LongitudeRateAngleRateReal NumberThe rate of change of the detic longitude.

Ground Track
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
RepeatingGroundTrackEquatorErrorDistanceReal NumberThe difference between the current longitude and the nearest grid point longitude computed as point of an orbit with the specified repeat count and reference longitude. This Calc Object should only be evaluated at an XY plane crossing. The reference longitude can range from -360 to 360 deg. The repeat count gives the number of orbits before the ground track repeats over the same longitude. The Calc Object allows a choice of a central body. The default is Earth.

Keplerian Elems
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Altitude_Of_ApoapsisDistanceReal NumberThe difference between the radius of apoapsis and the central body's equatorial radius. The Calc Object allows a choice of a central body. The default is Earth.
Altitude_Of_PeriapsisDistanceReal NumberThe difference between the radius of apoapsis and the central body's equatorial radius. The Calc Object allows a choice of a central body. The default is Earth.
Argument_of_LatitudeAngleReal Number or TextThe sum of the argument of periapsis and true anomaly. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Argument_of_PeriapsisAngleReal Number or TextThe angle from the ascending node to the periapsis vector measured in the orbit plane in the direction of the object's motion. The periapsis vector locates the closest point of the orbit. For a circular orbit, the value is defined to be zero (i.e., periapsis at the ascending node). The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
EccentricityUnitlessReal NumberA measure of the shape of the orbit. Values <1 indicate an ellipse (where zero is a circular orbit) and values >1 indicate a hyperbola.
Eccentric_AnomalyAngleReal Number or TextAn angle used for converting between true and mean anomaly. Has a geometrical definition as the angle between the line of apsides and a line running from the center of the ellipse to a point Q on a circle circumscribed about the ellipse. The point Q is a projection of the satellite along a line parallel to the minor axis of the ellipse. The Calc Object allows a choice of a central body. The default is Earth.
InclinationAngleReal Number or TextThe angle between the orbit plane and the XY plane of the coordinate system.
Longitude_Of_Ascending_NodeAngleReal Number or TextA measure of the right ascension of the ascending node, made in the Fixed frame. The value is the detic longitude of the orbit's ascending node. The ascending node crossing is assumed to be at, or prior to, the current position in the orbit in the same nodal revolution. The Calc Object allows a choice of a central body. The default is Earth.
MeanAnomalyAngleReal Number or TextA measure of the time past periapsis passing, expressed as an angle. The Calc Object allows a choice of a central body. The default is Earth.
Mean_MotionAngleRateReal NumberA measure of the osculating period of the orbit, expressed as an angular rate. The value is 2pi rad / orbit_period. The Calc Object allows a choice of a central body. The default is Earth.
Orbit_PeriodTimeReal NumberTime required for a complete revolution as computed from osculating semi-major axis length. The Calc Object allows a choice of a central body. The default is Earth.
RAANAngleReal Number or TextThe angle in the XY plane from the X axis to the ascending node, measured in a right-handed sense about the Z axis. in the equatorial plane. For equatorial orbits, the ascending node is defined to be directed along the positive X axis, and thus the value is 0.0. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Radius_Of_ApoapsisDistanceReal NumberThe magnitude of the apoapsis vector. The apoapsis vector (defined only when the eccentricity is <1) locates the position in the orbit furthest from the central body. The Calc Object allows a choice of a central body. The default is Earth.
Radius_Of_PeriapsisDistanceReal NumberThe magnitude of the periapsis vector. The periapsis vector locates the position in the orbit closest to the central body. The Calc Object allows a choice of a central body. The default is Earth.
Semimajor_AxisDistanceReal NumberA measure of the size of the orbit. Orbits with eccentricity less than 1 are ellipses, with major and minor axes identifying the symmetry axes of the ellipse, the major axis being the longer one. The value is half the length of the major axis. The Calc Object allows a choice of a central body. The default is Earth.
Time_Past_Asc_NodeTimeReal NumberThe elapsed time since passing the last ascending node crossing based on assumed two-body motion.. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Time_Past_PeriapsisTimeReal NumberThe elapsed time since passing the last periapsis crossing based on assumed two-body motion. The Calc Object allows a choice of a central body. The default is Earth.
True_AnomalyAngleReal Number or TextThe angle from the periapsis vector, measured in the orbit plane in the direction of motion, to the position vector. The Calc Object allows a choice of a central body. The default is Earth.

Maneuver
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
DeltaVRateReal NumberDelta-V magnitude integrated along the trajectory path.
DeltaV_SquaredSpeed Change SquaredReal NumberSquare of DeltaV integrated along path.
FuelMassMassReal NumberFuel mass remaining.
Fuel_DensitySmallDensityReal NumberDensity of the fuel.
Fuel_UsedMassReal NumberFuel used since the initial state of the spacecraft.
Inertial_DeltaVxRateReal NumberThe X component of accumulated Delta-V integrated in inertial coordinates.
Inertial_DeltaVyRateReal NumberThe Y component of accumulated Delta-V integrated in inertial coordinates.
Inertial_DeltaVzRateReal NumberThe Z component of accumulated Delta-V integrated in inertial coordinates.
Inertial_DeltaV_MagnitudeRateReal NumberThe magnitude of accumulated Delta-V integrated in inertial coordinates. Computed by integrating the thrust acceleration over time.
MCS_DeltaVSpeed ChangeReal NumberSum of DeltaV magnitude for all maneuvers in MCS.
MCS_DeltaV_SquaredSpeed Change SquaredReal NumberSum of squares of DeltaV magnitude for all maneuvers in MCS.
Specific_ImpulseSpecificImpulseReal NumberThe specific impulse during the maneuver, accounting for all engines, computed using the rocket equation.
Tank_PressurePressureReal NumberFuel tank pressure.
Tank_TemperatureTemperatureReal NumberFuel tank temperature.
Thrust_Vector_XForceReal NumberThe X component of the total thrust vector. The Calc Object allows a choice of coordinate systems. The default is Earth ICRF.
Thrust_Vector_YForceReal NumberThe Y component of the total thrust vector. The Calc Object allows a choice of coordinate systems. The default is Earth ICRF.
Thrust_Vector_ZForceReal NumberThe Z component of the total thrust vector. The Calc Object allows a choice of coordinate systems. The default is Earth ICRF.
Total_MassMassReal NumberTotal mass (fuel plus dry mass).
Total_Mass_Flow_RateMass Per TimeReal NumberThe total mass flow rate, accounting for all engines, during a maneuver.

Math
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Absolute_ValueDateReal Number or TextThe absolute value of a specified calculation object.
DifferenceTimeReal NumberThe difference of a specified calculation object. Difference is from the initial value.
NegativeDateReal Number or TextThe negative of a specified calculation object.

Mean Elems
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Mean_Argument_of_LatitudeAngleReal Number or TextThe sum of the argument of periapsis and true anomaly, where the angles are computed using Kozai-Izsak mean elements. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Mean_Argument_of_PerigeeAngleReal Number or TextThe angle from the ascending node to the periapsis vector measured in the orbit plane in the direction of the object's motion. The periapsis vector locates the closest point of the orbit. For a circular orbit, the value is defined to be zero (i.e., periapsis at the ascending node). The ascending node and periapsis vector are computed using Kozai-Izsak mean elements. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Mean_EccentricityUnitlessReal NumberA measure of the shape of the orbit. Values <1 indicate an ellipse (where zero is a circular orbit) and values >1 indicate a hyperbola. The value is computed using Kozai-Izsak mean elements. The Calc Object allows a choice of a central body. The default is Earth.
Mean_InclinationAngleReal Number or TextThe angle between the orbit plane and the XY plane of the coordinate system, where the orbit angular momentum vector is perpendicular to the orbit plane. The orbit angular momentum vector is computed using Kozai-Izsak mean elements. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Mean_Mean_AnomalyAngleReal Number or TextA measure of the time past periapsis passing, expressed as an angle. The periapsis direction is computed using Kozai-Izsak mean elements. The Calc Object allows a choice of a central body. The default is Earth.
Mean_Orbit_PeriodTimeReal NumberTime required for a complete revolution as computed from the mean semi-major axis length, computed using Kozai-Izsak mean elements. The Calc Object allows a choice of a central body. The default is Earth.
Mean_RAANAngleReal Number or TextThe angle in the XY plane from the X axis to the ascending node, measured in a right-handed sense about the Z axis. in the equatorial plane. For equatorial orbits, the ascending node is defined to be directed along the positive X axis, and thus the value is 0.0. The ascending node vector is computed using Kozai-Izsak mean elements. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Mean_Semimajor_AxisDistanceReal NumberA measure of the size of the orbit. Orbits with eccentricity <1 are ellipses, with major and minor axes identifying the symmetry axes of the ellipse, the major axis being the longer one. The value is half the length of the major axis. The value is computed using Kozai-Izsak mean elements. The Calc Object allows a choice of a central body. The default is Earth.
Mean_True_AnomalyAngleReal Number or TextThe angle from the periapsis vector, measured in the orbit plane in the direction of motion, to the position vector. The periapsis vector and position vector are computed using Kozai-Izsak mean elements. The Calc Object allows a choice of a central body. The default is Earth.

MultiBody
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
BDotRDistanceReal NumberDot product of B-Plane vectors B and R. B-vector is defined as the intersection of the B-plane and the trajectory plane, starting on the targeted central body and ending at the spot where the incoming asymptote crosses the B-plane. R is one of the axes of the B-plane.
BDotTDistanceReal NumberDot product of B-Plane vectors B and T. B-vector is defined as the intersection of the B-plane and the trajectory plane, starting on the targeted central body and ending at the spot where the incoming asymptote crosses the B-plane. T is one of the axes of the B-plane.
BMagnitudeDistanceReal NumberMagnitude of the B-plane B-vector. B-vector is defined as the intersection of the B-plane and the trajectory plane, starting on the targeted central body and ending at the spot where the incoming asymptote crosses the B-plane.
BThetaAngleReal Number or TextB-Plane theta angle is the angle between the B-vector and the T-axis of the B-plane.
Delta_DeclinationAngleReal Number or TextDelta Declination is the difference between the declination of the target body and that of the satellite with respect to the target body's parent body.
Delta_Right_AscAngleReal Number or TextDelta Right Ascension is the difference between the right ascension of the target body and that of the satellite. The right ascension is measured with respect to the target body's parent body, in the parent body's inertial coordinate system.
JacobiConstantUnitlessReal NumberThe single integral of the motion of the circular restricted three-body problem. Requires a valid Astrogator CR3BP propagated ephemeris for correct evaluation.

Other Orbit
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Apparent_Solar_TimeAngleReal Number or TextApparent solar time expressed as an angle. The Calc Object allows a choice of a central body. The default is Earth.
Beta_AngleAngleReal Number or TextThe angle between the orbit plane and the apparent sun direction. The Calc Object allows a choice of a central body. The default is Earth.
Earth_Mean_Local_Time_of_Ascending_NodeAngleReal Number or TextThe Mean Solar (Local) Time of the instantaneously evaluated ascending node. The ascending node is computed by converting the osculating right ascension of the ascending nodes to its equivalent longitude of ascending node. This value is then used to compute the associated instantaneous Mean Solar Time. The resulting evolution is a slowly varying smooth function between the nodes that matches the Mean Solar Time at the ascending node. The value is computed as an angle with units of degrees by default with 0/360 degrees being directly opposite the Mean Sun in shadow and 180 degrees aligned with the Mean Sun in light. Units of HMS for the angle are also available.
Earth_Mean_Solar_TimeAngleReal Number or TextApparent solar time modified for earth's equation of time, expressed as an angle. The Calc Object allows a choice of a central body. The default is Earth.
Local_Apparent_Solar_LongitudeAngleReal Number or TextApparent solar longitude minus vehicle longitude. The Calc Object allows a choice of a central body. The default is Earth.
Longitude_of_PeriapsisAngleReal Number or TextThe sum of the right ascension of the ascending node and the argument of periapsis. The Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is osculating. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Orbit_State_ValueDateReal Number or TextComputes the value of the specified Calc Object given the specified input values of position and velocity.
SignedEccentricityUnitlessReal NumberThe eccentricity multiplied by either 1.0 or -1.0. The value is positive if the mean anomaly is within pi/2 radians of the periapsis, else it is negative. The Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is osculating.
SignedInclinationAngleReal Number or TextThe inclination multiplied by either 1.0 or -1.0. The value is positive if the argument of latitude is within pi/2 radians of the ascending node, else it is negative. The Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is osculating.
True_LongitudeAngleReal Number or TextThe sum of the right ascension of the ascending node, the argument of periapsis, and the true anomaly. The Calc Object allows a choice of element type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms, and Brouwer-Lyddane Mean elements using both short and long period terms). The default is osculating. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.

Power
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
PowerPowerReal NumberThe power generated by a power source. The source can be solar panels, internal, or processed.

Relative Motion
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
CrossTrackDistanceReal NumberThe cross-track component of the relative position vector.
CrossTrackRateRateReal NumberThe cross-track component of the relative velocity vector as observed in the RIC rotating frame.
InTrackDistanceReal NumberThe in-track component of the relative position vector.
InTrackRateRateReal NumberThe in-track component of the relative velocity vector as observed in the RIC rotating frame.
NormalDistanceReal NumberThe normal component of the relative position vector.
NormalRateRateReal NumberThe normal component of the relative velocity vector as observed in the NTC rotating frame.
RadialDistanceReal NumberThe radial component of the relative position vector.
RadialRateRateReal NumberThe radial component of the relative velocity vector as observed in the RIC rotating frame.
RangeDistanceReal NumberThe range (i.e., distance between the primary and secondary object) at the given time.
RangeRateRateReal NumberThe rate of change of the magnitude of the relative position vector.
Relative_InclinationAngleReal Number or TextThe angle between the orbit normals of the satellite and reference satellite. Each orbit normal allows a choice of orbit normal type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms,and Brouwer-Lyddane Mean elements using both short and long period terms).
Relative_Position_Declination_AngleAngleReal Number or TextThe angle between the relative position and an orbit plane. The relative position may be specified as either from the satellite to the reference satellite or the reverse. The orbit plane may be specified as belonging to the satellite or the reference satellite, and allows a choice of orbit normal type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms,and Brouwer-Lyddane Mean elements using both short and long period terms). The sign convention may be specified as being positive or negative when the relative position lies above the orbit plane.
Relative_Position_InPlane_AngleAngleReal Number or TextThe dihedral angle about the orbit plane normal from the reference direction to the relative position (i.e., angle to projection of relative position into orbit plane from projection of reference direction into orbit plane). The relative position may be specified as either from the satellite to the reference satellite or the reverse. The orbit plane may be specified as belonging to the satellite or the reference satellite, and allows a choice of orbit normal type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms,and Brouwer-Lyddane Mean elements using both short and long period terms). The reference direction may be specified as being the satellite's or reference satellite's position or its opposite. Counter-clockwise rotation about the orbit normal may be specified as being either a positive or negative value for the angle.
RICAzimuthAngleReal Number or TextThe angle measured in the plane formed by the in-track and cross-track directions, positive from the In-Track direction toward the Cross-Track direction.
RICAzimuthRateAngleRateReal NumberThe rate of change of the RIC azimuth.
RICElevationAngleReal Number or TextThe angle measured perpendicular to the plane formed by the in-track and cross-track directions, positive toward the Radial direction.
RICElevationRateAngleRateReal NumberThe rate of change of the RIC elevation.
Solar_Beta_AngleAngleReal Number or TextThe angle between the relative Sun position and an orbit plane. The relative Sun position may be specified as either apparent or true, as measured from the satellite or from the reference satellite. The orbit plane may be specified as belonging to the satellite or the reference satellite, and allows a choice of orbit normal type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms,and Brouwer-Lyddane Mean elements using both short and long period terms). The sign convention may be specified as being positive or negative when the relative Sun position lies above the orbit plane.
Solar_InPlane_AngleAngleReal Number or TextThe dihedral angle about the orbit plane normal from the reference direction to the relative Sun position (i.e., angle to projection of Sun into orbit plane from projection of reference direction into orbit plane). The relative Sun position may be specified as either apparent or true, as measured from the satellite or from the reference satellite. The orbit plane may be specified as belonging to the satellite or the reference satellite, and allows a choice of orbit normal type (Osculating elements, Kozai-Izsak Mean elements, Brouwer-Lyddane Mean elements using only short period terms,and Brouwer-Lyddane Mean elements using both short and long period terms). The reference direction may be specified as being the satellite's or reference satellite's position or its opposite. Counter-clockwise rotation about the orbit normal may be specified as being either a positive or negative value for the angle.
TangentialDistanceReal NumberThe tangential component of the relative position vector.
TangentialRateRateReal NumberThe tangential component of the relative velocity vector as observed in the NTC rotating frame.
TimeDifferenceTimeReal NumberAlternative measure for in-track position difference, computed as duration. The duration is computed by dividing the in-track component of the relative position vector by the inertial velocity of the primary object.

SEET
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
DamageFluxFluxReal NumberThe total impact flux that cause damage, from all meteoroid particulates, found as a simple sum of the damaging impact flux of all particulates.
DamageMassFluxMassFluxReal NumberThe total impact mass flux that cause damage, from all meteoroid particulates, found as the integral of the damaging particle impact flux distribution with respect to mass.
GeoMagFieldDipoleLUnitlessReal NumberThe L value for the field line passing through the vehicle's location computed using the dipole approximation to the magnetic field.
GeoMagFieldFieldLineSeparationAngleReal Number or TextThe centric angle between the north footprint of the field line containing the vehicle's location and the north footprint of the field line containing the target's location. The north footprint is the point of intersection of the field line with the earth's surface north of the magnetic equator. If either north footprint is not defined, then the south footprint is used.
ImpactFluxFluxReal NumberThe total impact flux from all meteoroid particulates, found as a simple sum of the impact flux of all particulates.
ImpactMassFluxMassFluxReal NumberThe total impact mass flux from all meteoroid particulates, found as the integral of the particle impact flux distribution with respect to mass.
SAAFluxIntensityFluxIntensityReal NumberThe SAA flux intensity at the vehicle's location for the vehicle's channel specification.
VehicleTemperatureTemperatureReal NumberVehicle temperature, computed assuming thermal equilibrium.

STM Eigenvalues
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
lambda1ImagUnitlessReal NumberThe imaginary part of the first eigenvalue.
lambda1RealUnitlessReal NumberThe real part of the first eigenvalue.
lambda2ImagUnitlessReal NumberThe imaginary part of the second eigenvalue.
lambda2RealUnitlessReal NumberThe real part of the second eigenvalue.
lambda3ImagUnitlessReal NumberThe imaginary part of the third eigenvalue.
lambda3RealUnitlessReal NumberThe real part of the third eigenvalue.
lambda4ImagUnitlessReal NumberThe imaginary part of the fourth eigenvalue.
lambda4RealUnitlessReal NumberThe real part of the fourth eigenvalue.
lambda5ImagUnitlessReal NumberThe imaginary part of the fifth eigenvalue.
lambda5RealUnitlessReal NumberThe real part of the fifth eigenvalue.
lambda6ImagUnitlessReal NumberThe imaginary part of the sixth eigenvalue.
lambda6RealUnitlessReal NumberThe real part of the sixth eigenvalue.

STM Eigenvectors
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Lambda1PosXImagUnitlessReal NumberThe imaginary part of the PosX component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1PosXRealUnitlessReal NumberThe real part of the PosX component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1PosYImagUnitlessReal NumberThe imaginary part of the PosY component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1PosYRealUnitlessReal NumberThe real part of the PosY component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1PosZImagUnitlessReal NumberThe imaginary part of the PosZ component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1PosZRealUnitlessReal NumberThe real part of the PosZ component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1VelXImagUnitlessReal NumberThe imaginary part of the VelX component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1VelXRealUnitlessReal NumberThe real part of the VelX component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1VelYImagUnitlessReal NumberThe imaginary part of the VelY component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1VelYRealUnitlessReal NumberThe real part of the VelY component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1VelZImagUnitlessReal NumberThe imaginary part of the VelZ component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda1VelZRealUnitlessReal NumberThe real part of the VelZ component of the first eigenvector (i.e., the eigenvector associated with the first eigenvalue lambda1).
Lambda2PosXImagUnitlessReal NumberThe imaginary part of the PosX component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2PosXRealUnitlessReal NumberThe real part of the PosX component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2PosYImagUnitlessReal NumberThe imaginary part of the PosY component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2PosYRealUnitlessReal NumberThe real part of the PosY component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2PosZImagUnitlessReal NumberThe imaginary part of the PosZ component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2PosZRealUnitlessReal NumberThe real part of the PosZ component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2VelXImagUnitlessReal NumberThe imaginary part of the VelX component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2VelXRealUnitlessReal NumberThe real part of the VelX component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2VelYImagUnitlessReal NumberThe imaginary part of the VelY component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2VelYRealUnitlessReal NumberThe real part of the VelY component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2VelZImagUnitlessReal NumberThe imaginary part of the VelZ component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda2VelZRealUnitlessReal NumberThe real part of the VelZ component of the second eigenvector (i.e., the eigenvector associated with the second eigenvalue lambda2).
Lambda3PosXImagUnitlessReal NumberThe imaginary part of the PosX component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3PosXRealUnitlessReal NumberThe real part of the PosX component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3PosYImagUnitlessReal NumberThe imaginary part of the PosY component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3PosYRealUnitlessReal NumberThe real part of the PosY component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3PosZImagUnitlessReal NumberThe imaginary part of the PosZ component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3PosZRealUnitlessReal NumberThe real part of the PosZ component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3VelXImagUnitlessReal NumberThe imaginary part of the VelX component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3VelXRealUnitlessReal NumberThe real part of the VelX component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3VelYImagUnitlessReal NumberThe imaginary part of the VelY component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3VelYRealUnitlessReal NumberThe real part of the VelY component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3VelZImagUnitlessReal NumberThe imaginary part of the VelZ component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda3VelZRealUnitlessReal NumberThe real part of the VelZ component of the third eigenvector (i.e., the eigenvector associated with the third eigenvalue lambda3).
Lambda4PosXImagUnitlessReal NumberThe imaginary part of the PosX component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4PosXRealUnitlessReal NumberThe real part of the PosX component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4PosYImagUnitlessReal NumberThe imaginary part of the PosY component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4PosYRealUnitlessReal NumberThe real part of the PosY component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4PosZImagUnitlessReal NumberThe imaginary part of the PosZ component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4PosZRealUnitlessReal NumberThe real part of the PosZ component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4VelXImagUnitlessReal NumberThe imaginary part of the VelX component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4VelXRealUnitlessReal NumberThe real part of the VelX component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4VelYImagUnitlessReal NumberThe imaginary part of the VelY component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4VelYRealUnitlessReal NumberThe real part of the VelY component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4VelZImagUnitlessReal NumberThe imaginary part of the VelZ component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda4VelZRealUnitlessReal NumberThe real part of the VelZ component of the fourth eigenvector (i.e., the eigenvector associated with the fourth eigenvalue lambda4).
Lambda5PosXImagUnitlessReal NumberThe imaginary part of the PosX component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5PosXRealUnitlessReal NumberThe real part of the PosX component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5PosYImagUnitlessReal NumberThe imaginary part of the PosY component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5PosYRealUnitlessReal NumberThe real part of the PosY component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5PosZImagUnitlessReal NumberThe imaginary part of the PosZ component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5PosZRealUnitlessReal NumberThe real part of the PosZ component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5VelXImagUnitlessReal NumberThe imaginary part of the VelX component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5VelXRealUnitlessReal NumberThe real part of the VelX component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5VelYImagUnitlessReal NumberThe imaginary part of the VelY component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5VelYRealUnitlessReal NumberThe real part of the VelY component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5VelZImagUnitlessReal NumberThe imaginary part of the VelZ component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda5VelZRealUnitlessReal NumberThe real part of the VelZ component of the fifth eigenvector (i.e., the eigenvector associated with the fifth eigenvalue lambda5).
Lambda6PosXImagUnitlessReal NumberThe imaginary part of the PosX component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6PosXRealUnitlessReal NumberThe real part of the PosX component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6PosYImagUnitlessReal NumberThe imaginary part of the PosY component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6PosYRealUnitlessReal NumberThe real part of the PosY component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6PosZImagUnitlessReal NumberThe imaginary part of the PosZ component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6PosZRealUnitlessReal NumberThe real part of the PosZ component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6VelXImagUnitlessReal NumberThe imaginary part of the VelX component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6VelXRealUnitlessReal NumberThe real part of the VelX component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6VelYImagUnitlessReal NumberThe imaginary part of the VelY component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6VelYRealUnitlessReal NumberThe real part of the VelY component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6VelZImagUnitlessReal NumberThe imaginary part of the VelZ component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).
Lambda6VelZRealUnitlessReal NumberThe real part of the VelZ component of the sixth eigenvector (i.e., the eigenvector associated with the sixth eigenvalue lambda6).

Scalar
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
ScalarUnitlessReal NumberScalar calculation component.

Scripts
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
CustomFunctionCalcObjectUnitlessReal NumberCalculation produced by a Custom Function.
JScriptUnitlessReal NumberJScript.
MatlabUnitlessReal NumberCalculation produced by a MATLAB inline function.
PerlUnitlessReal NumberCalculation produced by a Perl inline function.
VBScriptUnitlessReal NumberCalculation produced by a VBScript inline function.

Spacecraft Properties
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
CdUnitlessReal NumberThe dimensionless drag coefficient associated with the drag area.
CrUnitlessReal NumberThe solar radiation pressure coefficient.
DragAreaSmall AreaReal NumberThe area used in the computation of atmospheric drag.
RadPressureAreaSmall AreaReal NumberThe area used in radiation pressure computations.
RadPressureCoefficientUnitlessReal NumberThe radiation pressure coefficient.
SRPAreaSmall AreaReal NumberThe area used in Solar radiation pressure computations.

Spherical Elems
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Cosine_of_Vertical_FPAUnitlessReal NumberThe dot product of the unit position and unit velocity vectors. The Calc Object allows a choice of a central body. The default is Earth.
DeclinationAngleReal Number or TextThe signed angle measured from the XY plane to the position vector, where positive angles are used for locations above the XY plane, and negative for those below.
Declination_RateAngleRateReal NumberThe rate of change in the declination.
Flight_Path_AngleAngleReal Number or TextThe angle between the position and velocity vectors. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Right_AscAngleReal Number or TextThe signed angle measured from the X axis to the projection of the position vector into the XY plane. The angle increases in the direction found by the right hand rule about the Z axis. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Right_Asc_RateAngleRateReal NumberRight Ascension Rate.
R_MagDistanceReal NumberThe magnitude of the position vector (i.e. the radius vector). The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Velocity_AzimuthAngleReal Number or TextThe angle, measured in the plane perpendicular to the position vector, between the local north direction and the projection of the velocity vector onto that plane, measured as positive moving toward local east. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
V_MagRateReal NumberThe magnitude of the velocity vector, as observed in the coordinate system. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.

Target Vector
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
C3_EnergyRate SquaredReal NumberAn energy defined as -(mu/semi-major-axis). The Calc Object allows a choice of a central body. The default is Earth.
Incoming_Asymptote_DecAngleReal Number or TextDeclination of incoming asymptote or apsides. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Incoming_Asymptote_RAAngleReal Number or TextRight Ascension of incoming asymptote or apsides. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Incoming_Vel_Az_at_PeriapsisAngleReal Number or TextVelocity azimuth at periapsis for incoming trajectory. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Outgoing_Asymptote_DecAngleReal Number or TextDeclination of outgoing asymptote or apsides. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Outgoing_Asymptote_RAAngleReal Number or TextRight Ascension of outgoing asymptote or apsides. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.
Outgoing_Vel_Az_at_PeriapsisAngleReal Number or TextVelocity azimuth at periapsis for outgoing trajectory. The Calc Object allows a choice of coordinate systems. The default is Earth Centered Inertial.

Time
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
DurationTimeReal NumberThe duration of the event.
Number_of_RevolutionsUnitlessReal NumberThe fraction of the osculating or mean orbit period since the startTime (not always monotonic).

UserValues
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
User_valueUnitlessReal NumberThe value of a user variable.

Vector
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
AngleAngleReal Number or TextThe value of the angle at the given time.
Angle_Between_VectorsAngleReal Number or TextThe angle between two specified vectors.
Dot_ProductUnitlessReal NumberThe dot Product of two specified vectors.
Vector_DecAngleReal Number or TextThe declination of the specified vector.
Vector_MagUnitlessReal NumberThe magnitude of the specified vector.
Vector_RAAngleReal Number or TextThe right ascension of the specified vector.
Vector_XUnitlessReal NumberThe X component of the specified vector.
Vector_YUnitlessReal NumberThe Y component of the specified vector.
Vector_ZUnitlessReal NumberThe Z component of the specified vector.

Segment Data
NameDimensionTypeDescription
TimeDateReal Number or TextTime.
Segment NameUnitlessTextThe name of the segment that produced ephemeris over this interval.
Segment TypeUnitlessTextThe type of the segment.