This attribute lets you select the coordinate system to be used by a joining condition.
Astrogator <Satellite Object Path> SetValue <Attribute Path>.JoiningConditions.{Joining Condition}.CalcObjectAttributes.CoordSystem {Value}
This attribute is interchangeable with the Central Body attribute. It is used only for joining conditions that take the coordinate system into account for example, Argument of Latitude). The default coordinate system of a joining condition is Earth Inertial. The value can be any coordinate system listed in the Select Reference Axes window of the Component Browser. If you require additional coordinate systems, you can define them using the Vector Geometry Tool. Make certain that the name is copied exactly and that spaces are replaced by underscores. In addition, the coordinate system name must be preceded by the class name (for example, CentralBody) and a forward slash "/".
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Follow.JoiningConditions.R_Magnitude.CalcObjectAttributes.CoordSystem "CentralBody/Mars Inertial"
STK Programming Interface 11.0.1