This attribute lets you define the Central Body used by a joining condition.
Astrogator <Satellite Object Path> SetValue <Attribute Path>.JoiningConditions.{Joining Condition}.CalcObjectAttributes.CentralBody {Value}
This attribute is interchangeable with the Coordinate System attribute. It is apparent only for joining coniditions that take the central body into account (i.e., Periapsis). The default central body of a joining conidition is the Earth. You can find a list of all central bodies in the Component Browser. If you require additional ones, you can duplicate Ceres or Deimos and adjust its properties to fit your needs. SPICE files are available for most Moons from JPL at http://pds-naif.jpl.nasa.gov/.
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Follow.JoiningConditions.Altitude.CalcObjectAttributes.CentralBody Moon
STK Programming Interface 11.0.1