Data reported at the stop time of each
close approach event.
| Name |
Dimension |
Type |
Description |
| Primary Roll |
AngleUnit |
Real Number |
The roll angle for the primary object's ellipsoid
at the given time. The roll angle locates the minor axis of the
ellipsoid as a rotation about the major axis, with zero being
aligned with the cross-track direction. |
| Approach Angle |
AngleUnit |
Real Number |
The angle between the inertial velocity of the
primary object and the inertial velocity of the secondary object at
the given time |
| Ellipsoid Norm wrt Primary |
Unitless |
Real Number or Text |
A measure of the "distance" between the primary and
secondary object, using the primary object's ellipsoid size as a
norm, at the given time. If the primary ellipsoid size were to be
scaled uniformly by this value, then the ellipsoid would just touch
the secondary. The value is set to "Undefined" if an error occurs
computing the norm. |
| Ellipsoid Norm wrt
Secondary |
Unitless |
Real Number or Text |
A measure of the "distance" between the primary and
secondary object, using the secondary object's ellipsoid size as a
norm, at the given time. If the secondary ellipsoid size were to be
scaled uniformly by this value, then the ellipsoid would just touch
the primary. The value is set to "Undefined" if an error occurs
computing the norm. |
| Event Defn |
Unitless |
Text |
The method of determining the event: Local Minimum,
EndPoint Minimum, or Below Threshold. |
| Event |
Unitless |
Text |
Type of event (i.e., the name of the folder). |
| Separation |
DistanceUnit |
Real Number or Text |
The separation distance between the primary and
secondary threat volumes at the given time. If the ellipsoids
intersect, then the value will be "Intersect". |
| EventTime |
DateFormat |
Real Number |
The time at which the event occurs. |
| Primary Alt |
DistanceUnit |
Real Number |
The primary object's detic altitude at the given
time. |
| Primary 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. |
| Primary 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. |
| Primary
Ellipsoid - Max |
DistanceUnit |
Real Number |
The length of the longest symmetry axis of the
primary object's ellipsoid at the given time. |
| Primary Ellipsoid - Middle |
DistanceUnit |
Real Number |
The length of the intermediate symmetry axis of the
primary object's ellipsoid at the given time. |
| Primary
Ellipsoid - Min |
DistanceUnit |
Real Number |
The length of the shortest symmetry axis of the
primary object's ellipsoid at the given time. |
| Primary 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. |
| Primary 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. |
| Primary Lat |
LatitudeUnit |
Real Number |
The primary object's detic latitude at the given
time. |
| Primary Lon |
LongitudeUnit |
Real Number |
The primary object's detic longitude at the given
time. |
| Primary Name |
Unitless |
Text |
The name of the primary object in the close
approach event. |
| Primary NumberID |
Unitless |
Text |
The number identifier of the primary object
involved in the close approach event. If the object has no number
identifier, then the value will be "Not Avail". |
| Primary 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. |
| Primary Radius |
DistanceUnit |
Real Number |
The magnitude of the position vector of the primary
object. |
| Primary Rev |
Unitless |
Integer |
The rev (pass) number for the primary object. |
| Primary SourceID |
Unitless |
Text |
The identifier of the primary as used by the
ephemeris source for the object. For example, the identifier for
objects that use a GPS sem or yuma file is PRN-##. |
| Primary Speed |
Rate |
Real Number |
The magnitude of the inertial velocity vector of
the primary object. |
| Primary SSC |
Unitless |
Integer |
The SSC number of the primary object involved in
the close approach event. |
| Velocity wrt Primary -
CrossTrack |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., secondary inertial velocity vector minus primary
inertial velocity vector) in the primary object's cross-track
direction at the given time. The cross-track direction lies along
the object's orbit normal. |
| Primary StringID |
Unitless |
Text |
The string identifier of the primary object
involved in the close approach event. If the object has no string
identifier, then the value will be "Not Avail". |
| Primary vx |
Rate |
Real Number |
The X component of the inertial velocity vector of
the primary object at the given time. |
| Velocity wrt Primary -
Tangential |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., secondary inertial velocity vector minus primary
inertial velocity vector) in the primary object's tangential
direction at the given time. The tangential direction lies along
the object's inertial velocity. |
| Velocity wrt Primary -
Normal |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., secondary inertial velocity vector minus primary
inertial velocity vector) in the primary object's normal direction
at the given time. The normal direction completes a triad involving
the tangential and cross-track directions and is akin to the radial
direction. |
| Primary vy |
Rate |
Real Number |
The Y component of the inertial velocity vector of
the primary object at the given time. |
| Velocity wrt Primary -
Radial |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., secondary inertial velocity vector minus primary
inertial velocity vector) in the primary object's radial direction
at the given time. |
| Velocity wrt Primary -
InTrack |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., secondary inertial velocity vector minus primary
inertial velocity vector) in the primary object's in-track
direction at the given time. The in-track direction completes a
triad involving the radial and cross-track directions. |
| Primary vz |
Rate |
Real Number |
The Z component of the inertial velocity vector of
the primary object at the given time. |
| Primary x |
DistanceUnit |
Real Number |
The X component of the inertial position vector of
the primary object at the given time. |
| Velocity wrt Secondary -
CrossTrack |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., primary inertial velocity vector minus secondary
inertial velocity vector) in the secondary object's cross-track
direction at the given time. The cross-track direction lies along
the object's orbit normal. |
| Primary y |
DistanceUnit |
Real Number |
The Y component of the inertial position vector of
the primary object at the given time. |
| Primary z |
DistanceUnit |
Real Number |
The Z component of the inertial position vector of
the primary object at the given time. |
| Velocity wrt Secondary -
Tangential |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., primary inertial velocity vector minus secondary
inertial velocity vector) in the secondary object's tangential
direction at the given time. The tangential direction lies along
the object's inertial velocity. |
| Velocity wrt Secondary -
Normal |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., primary inertial velocity vector minus secondary
inertial velocity vector) in the secondary object's normal
direction at the given time. The normal direction completes a triad
involving the tangential and cross-track directions and is akin to
the radial direction. |
| Primary: Time Since Epoch |
TimeUnit |
Real Number |
The difference between the given time and the
primary object's epoch. |
| Velocity wrt Secondary -
Radial |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., primary inertial velocity vector minus secondary
inertial velocity vector) in the secondary object's radial
direction at the given time. |
| Velocity wrt Secondary -
InTrack |
Rate |
Real Number |
The component of the relative inertial velocity
vector (i.e., primary inertial velocity vector minus secondary
inertial velocity vector) in the secondary object's in-track
direction at the given time. The in-track direction completes a
triad involving the radial and cross-track directions. |
| Range Sigma |
Unitless |
Real Number |
The value of the range between the objects measured
at TCA, expressed in terms of sigma (i.e., the scale factor by
which the combined covariance ellipsoid would need to be scaled to
just touch the range vector). |
| Range
Uncertainty |
DistanceUnit |
Real Number |
The uncertainty in the range at the given time. The
uncertainty is computed by treating the ellipsoid size and
orientation as a measure of the position covariance for each
object. The relative position covariance is then computed and
projected onto the line of sight direction between the two objects
to compute the value. |
| Secondary Alt |
DistanceUnit |
Real Number |
The secondary object's detic altitude at the given
time. |
| Range wrt Primary -
CrossTrack |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., secondary position vector minus primary position vector) in
the primary object's cross-track direction at the given time. The
cross-track direction lies along the object's orbit normal. |
| Range wrt Primary - InTrack |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., secondary position vector minus primary position vector) in
the primary object's in-track direction at the given time. The
in-track direction completes a triad involving the radial and
cross-track directions. |
| Range wrt Primary - Normal |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., secondary position vector minus primary position vector) in
the primary object's normal direction at the given time. The normal
direction completes a triad involving the tangential and
cross-track directions and is akin to the radial direction. |
| Range wrt Primary - Radial |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., secondary position vector minus primary position vector) in
the primary object's radial direction at the given time. |
| Secondary Lat |
LatitudeUnit |
Real Number |
The secondary object's detic latitude at the given
time. |
| Range wrt Primary -
Tangential |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., secondary position vector minus primary position vector) in
the primary object's tangential direction at the given time. The
tangential direction lies along the object's inertial
velocity. |
| Secondary Lon |
LongitudeUnit |
Real Number |
The secondary object's detic longitude at the given
time. |
| Range wrt Secondary -
CrossTrack |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., primary position vector minus secondary position vector) in
the secondary object's cross-track direction at the given time. The
cross-track direction lies along the object's orbit normal. |
| Secondary Radius |
DistanceUnit |
Real Number |
The magnitude of the position vector of the
secondary object. |
| Secondary Ellipsoid -
CrossTrack |
DistanceUnit |
Real Number |
The length of the secondary object's ellipsoid at
the given time in the cross-track direction. The cross-track
direction lies along the object's orbit normal. |
| Range wrt Secondary -
InTrack |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., primary position vector minus secondary position vector) in
the secondary object's in-track direction at the given time. The
in-track direction completes a triad involving the radial and
cross-track directions. |
| Range wrt Secondary -
Normal |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., primary position vector minus secondary position vector) in
the secondary object's normal direction at the given time. The
normal direction completes a triad involving the tangential and
cross-track directions and is akin to the radial direction. |
| Secondary Ellipsoid - Max |
DistanceUnit |
Real Number |
The length of the longest symmetry axis of the
secondary object's ellipsoid at the given time. |
| Secondary Ellipsoid -
Tangential |
DistanceUnit |
Real Number |
The length of the secondary object's ellipsoid at
the given time in the tangential direction. The tangential
direction lies along the object's inertial velocity. |
| Range wrt Secondary -
Radial |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., primary position vector minus secondary position vector) in
the secondary object's radial direction at the given time. |
| Secondary x |
DistanceUnit |
Real Number |
The X component of the inertial position vector of
the secondary object at the given time. |
| Secondary Ellipsoid -
Normal |
DistanceUnit |
Real Number |
The length of the secondary 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. |
| Secondary y |
DistanceUnit |
Real Number |
The Y component of the inertial position vector of
the secondary object at the given time. |
| Secondary: Time Since Epoch |
TimeUnit |
Real Number |
The difference between the given time time and the
secondary object's epoch. |
| Secondary Ellipsoid -
Middle |
DistanceUnit |
Real Number |
The length of the intermediate symmetry axis of the
secondary object's ellipsoid at the given time. |
| Range wrt Secondary -
Tangential |
DistanceUnit |
Real Number |
The component of the relative position vector
(i.e., primary position vector minus secondary position vector) in
the secondary object's tangential direction at the given time. The
tangential direction lies along the object's inertial
velocity. |
| Secondary z |
DistanceUnit |
Real Number |
The Z component of the inertial position vector of
the secondary object at the given time. |
| Secondary Ellipsoid - Min |
DistanceUnit |
Real Number |
The length of the shortest symmetry axis of the
secondary object's ellipsoid at the given time. |
| Secondary vx |
Rate |
Real Number |
The X component of the inertial velocity vector of
the secondary object at the given time. |
| Secondary Speed |
Rate |
Real Number |
The magnitude of the inertial velocity vector of
the secondary object. |
| Secondary vy |
Rate |
Real Number |
The Y component of the inertial velocity vector of
the secondary object at the given time. |
| Range |
DistanceUnit |
Real Number |
The range (i.e., distance between the primary and
secondary object) at the given time. |
| Secondary vz |
Rate |
Real Number |
The Z component of the inertial velocity vector of
the secondary object at the given time. |
| Relative
Velocity |
Rate |
Real Number |
The magnitude of the difference in the inertial
velocities of the primary and secondary objects at the given
time. |
| Secondary Name |
Unitless |
Text |
The name of the secondary object in the close
approach event. |
| Secondary
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". |
| Secondary Pitch |
AngleUnit |
Real Number |
The pitch angle for the secondary 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. |
| Secondary Rev |
Unitless |
Integer |
The rev (pass) number for the secondary
object. |
| Secondary Roll |
AngleUnit |
Real Number |
The roll angle for the secondary object's ellipsoid
at the given time. The roll angle locates the minor axis of the
ellipsoid as a rotation about the major axis, with zero being
aligned with the cross-track direction. |
| Secondary
SourceID |
Unitless |
Text |
The identifier of the secondary as used by the
ephemeris source for the object. For example, the identifier for
objects that use a GPS sem or yuma file is PRN-##. |
| Secondary SSC |
Unitless |
Integer |
The SSC number of the secondary object involved in
the close approach event. |
| Secondary Yaw |
AngleUnit |
Real Number |
The yaw angle for the secondary 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. |
| Secondary
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". |