Primary Ephemeris
Provides ephemeris and other information of the primary bodies as a function of time. Not restricted to conjuncting intervals.Available for these objects: AdvCAT
Type: Time-varying data.
Availability: Reports
Data Provider Elements
| Name | Dimension | Type | Description |
|---|---|---|---|
| Time | Date | Real Number or Text | Time. |
| SSC | Unitless | Integer | The SSC identifier of the object experiencing a problem. |
| 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". |
| 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". |
| Concurrent Events | Unitless | Integer | The number of secondaries experiencing a close approach event with the primary object at the given time. |
| Time Since Epoch | Time | Real Number | The difference between the event time and the primary object's epoch. |
| x | Distance | Real Number | The X component of the position vector. |
| y | Distance | Real Number | The Y component of the position vector. |
| z | Distance | Real Number | The Z component of the position vector. |
| Latitude | Latitude | Real Number or Text | The detic latitude (i.e., angle between the detic subpoint's surface normal vector and the XY plane.). |
| Longitude | Longitude | Real Number or Text | 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. |
| Altitude | Distance | Real Number | The altitude value (i.e., magnitude of the relative position vector between the object and its detic subpoint). |
| vx | Rate | Real Number | X Cartesian component of velocity. |
| vy | Rate | Real Number | Y Cartesian component of velocity. |
| vz | Rate | Real Number | Z Cartesian component of velocity. |
| Ellipsoid - Tangential | Distance | 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. |
| Ellipsoid - CrossTrack | Distance | 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. |
| Ellipsoid - Normal | Distance | 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 - 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. |
| 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. |
| 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. |
| Ellipsoid - Max | Distance | Real Number | The length of the longest symmetry axis of the primary object's ellipsoid at the given time. |
| Ellipsoid - Middle | Distance | Real Number | The length of the intermediate symmetry axis of the primary object's ellipsoid at the given time. |
| Ellipsoid - Min | Distance | Real Number | The length of the shortest symmetry axis of the primary object's ellipsoid at the given time. |
| Ellipsoid - CovMtx XX | Area | Real Number | The (1,1) component of the position covariance matrix for the primary obtained by interpreting the primary's ellipsoid size and orientation as that matrix's 1-sigma equal probability surface. |
| Ellipsoid - CovMtx YX | Area | Real Number | The (2,1) component of the position covariance matrix for the primary obtained by interpreting the primary's ellipsoid size and orientation as that matrix's 1-sigma equal probability surface. |
| Ellipsoid - CovMtx YY | Area | Real Number | The (2,2) component of the position covariance matrix for the primary obtained by interpreting the primary's ellipsoid size and orientation as that matrix's 1-sigma equal probability surface. |
| Ellipsoid - CovMtx ZX | Area | Real Number | The (3,1) component of the position covariance matrix for the primary obtained by interpreting the primary's ellipsoid size and orientation as that matrix's 1-sigma equal probability surface. |
| Ellipsoid - CovMtx ZY | Area | Real Number | The (3,2) component of the position covariance matrix for the primary obtained by interpreting the primary's ellipsoid size and orientation as that matrix's 1-sigma equal probability surface. |
| Ellipsoid - CovMtx ZZ | Area | Real Number | The (3,3) component of the position covariance matrix for the primary obtained by interpreting the primary's ellipsoid size and orientation as that matrix's 1-sigma equal probability surface. |
| Yaw | Angle | Real Number or Text | 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. |
| Pitch | Angle | Real Number or Text | 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 | Angle | Real Number or Text | 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. |