This attribute specifies the trip value of a joining condition.
Astrogator <Satellite Object Path> SetValue <Attribute Path>.JoiningConditions.{Joining Condition}.TripValue <Value> [{Unit}]
The value for the trip is the value at which the follow segment will join the leader. Use a standard time unit of measure.
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Follow.JoiningConditions.Duration.TripValue 86400 sec
STK Programming Interface 11.0.1