Aircraft: Astrogator Values: Formation

Calc 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.

Name Dimension Type Description
Time DateFormat Real Number Time.
CloseApproachBearing AngleUnit Real Number The angle from the relative velocity vector to the reference vehicle. The Calc Object allows a choice of a central body. The default is Earth.
CloseApproachMagnitude DistanceUnit Real Number The 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.
CloseApproachTheta AngleUnit Real Number The angle from X to close approach vector. The Calc Object allows a choice of a central body. The default is Earth.
CloseApproachX DistanceUnit Real Number The X component of close approach vector. The Calc Object allows a choice of a central body. The default is Earth.
CloseApproachY DistanceUnit Real Number The Y component of close approach vector. The Calc Object allows a choice of a central body. The default is Earth.
CosineOfCloseApproachBearing Unitless Real Number The cosine of the close approach bearing. The Calc Object allows a choice of a central body. The default is Earth.
RelGroundTrackError DistanceUnit Real Number Ground 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_Lat AngleUnit Real Number The relative mean argument of latitude compared to the reference vehicle.
Rel_Mean_Arg_of_Perigee AngleUnit Real Number The relative mean argument of perigee compared to the reference vehicle.
Rel_Mean_Eccentricity Unitless Real Number The relative mean eccentricity compared to the reference vehicle.
Rel_Mean_Inclination AngleUnit Real Number The relative mean inclination compared to the reference vehicle.
Rel_Mean_Mean_Anomaly AngleUnit Real Number The relative mean mean anomaly compared to the reference vehicle.
Rel_Mean_Period TimeUnit Real Number The relative mean orbit period compared to the reference vehicle.
Rel_Mean_RAAN AngleUnit Real Number The relative mean RAAN compared to the reference vehicle.
Rel_Mean_Semimajor_Axis DistanceUnit Real Number The relative mean semimajor axis compared to the reference vehicle.
RelativeAtAOL TimeUnit Real Number The 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.
RelativeValue TimeUnit Real Number The 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.

STK Programming Interface 11.0.1