Calc Objects for the ephemeris of the
object, expressed in spherical elements.
| Name |
Dimension |
Type |
Description |
| Time |
DateFormat |
Real Number |
Time. |
| Cosine_of_Vertical_FPA |
Unitless |
Real Number |
The dot product of the unit position and unit
velocity vectors. The Calc Object allows a choice of a central
body. The default is Earth. |
| Declination |
AngleUnit |
Real Number |
The 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_Rate |
AngleRateUnit |
Real Number |
The rate of change in the declination |
| Flight_Path_Angle |
AngleUnit |
Real Number |
The angle between the position and velocity
vectors. The Calc Object allows a choice of coordinate systems. The
default is Earth Centered Inertial. |
| R_Mag |
DistanceUnit |
Real Number |
The 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. |
| Right_Asc |
AngleUnit |
Real Number |
The 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_Rate |
AngleRateUnit |
Real Number |
Right Ascension Rate |
| V_Mag |
Rate |
Real Number |
The 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. |
| Velocity_Azimuth |
AngleUnit |
Real Number |
The 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. |