Data Providers: AdvCAT: Primary Ephemeris

AdvCAT: Primary Ephemeris

Provides ephemeris and other information of the primary bodies as a function of time. Not restricted to conjuncting intervals.

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

Availability: Reports

Name	Dimension	Type	Description
Ellipsoid - Tangential	DistanceUnit	Real Number	The length of the primary object's ellipsoid at the given time in the tangential direction. The tangential direction lies along the object's inertial velocity.
Altitude	DistanceUnit	Real Number	The altitude value (i.e., magnitude of the relative position vector between the object and its detic subpoint).
Ellipsoid - Normal	DistanceUnit	Real Number	The length of the primary object's ellipsoid at the given time in the normal direction. The normal direction completes a triad involving the tangential and cross-track directions and is akin to the radial direction.
Ellipsoid - Middle	DistanceUnit	Real Number	The length of the intermediate symmetry axis of the primary object's ellipsoid at the given time.
x	DistanceUnit	Real Number	The X component of the position vector.
Concurrent Events	Unitless	Integer	The number of secondaries experiencing a close approach event with the primary object at the given time.
y	DistanceUnit	Real Number	The Y component of the position vector.
Ellipsoid - Min	DistanceUnit	Real Number	The length of the shortest symmetry axis of the primary object's ellipsoid at the given time.
Ellipsoid - CrossTrack	DistanceUnit	Real Number	The length of the primary object's ellipsoid at the given time in the cross-track direction. The cross-track direction lies along the object's orbit normal.
z	DistanceUnit	Real Number	The Z component of the position vector.
vx	Rate	Real Number	X Cartesian component of velocity.
Ellipsoid - Max	DistanceUnit	Real Number	The length of the longest symmetry axis of the primary object's ellipsoid at the given time.
vy	Rate	Real Number	Y Cartesian component of velocity.
Latitude	LatitudeUnit	Real Number	The detic latitude (i.e., angle between the detic subpoint's surface normal vector and the XY plane.)
vz	Rate	Real Number	Z Cartesian component of velocity.
Longitude	LongitudeUnit	Real Number	The 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.
NumberID	Unitless	Text	The number identifier of the secondary object involved in the close approach event. If the object has no number identifier, then the value will be "Not Avail".
Pitch	AngleUnit	Real Number	The pitch angle for the primary object's ellipsoid at the given time. The pitch angle locates the major axis of the ellipsoid from the plane whose normal is the cross-track direction.
Roll	AngleUnit	Real Number	Roll angle between the two sets of axes. Defines rotation about the x-axis of the reference set, which occurs in order defined by placement of its index (1) in selected sequence in YPR angles representation.
SSC	Unitless	Integer	The SSC identifier of the object experiencing a problem.
StringID	Unitless	Text	The string identifier of the secondary object involved in the close approach event. If the object has no string identifier, then the value will be "Not Avail".
Time Since Epoch	TimeUnit	Real Number	The difference between the event time and the primary object's epoch.
Yaw	AngleUnit	Real Number	The yaw angle for the primary object's ellipsoid at the given time. The yaw angle locates from the tangential direction the projection of the major axis of the ellipsoid onto the plane whose normal is the cross-track direction.
Time	DateFormat	Real Number	Time.
Primary Ellipsoid - CrossTrack - Tangential	Unitless	Real Number	For a Covariance class threat volume, this is the correlation coefficient between the crosstrack and tangential position estimation errors for the primary vehicle.
Primary Ellipsoid - Normal - Tangential	Unitless	Real Number	For a Covariance class threat volume, this is the correlation coefficient between the normal and tangential position estimation errors for the primary vehicle.
Primary Ellipsoid - Normal - CrossTrack	Unitless	Real Number	For a Covariance class threat volume, this is the correlation coefficient between the normal and crosstrack position estimation errors for the primary vehicle.
Secondary Ellipsoid - CrossTrack-Tangential	Unitless	Real Number	For a Covariance class threat volume, this is the correlation coefficient between the crosstrack and tangential position estimation errors for the secondary vehicle.
Secondary Ellipsoid - Normal-Tangential	Unitless	Real Number	For a Covariance class threat volume, this is the correlation coefficient between the normal and tangential position estimation errors for the secondary vehicle.
Secondary Ellipsoid - Normal-CrossTrack	Unitless	Real Number	For a Covariance class threat volume, this is the correlation coefficient between the normal and crosstrack position estimation errors for the secondary vehicle.