You are correct - I just checked, and 100 planetary diameters are far beyond the moon orbit in Earth's case. So not in planetary orbit, but 100 planetary diameters from it - in case of Earth, that would be about 0.01 AU (1,274,200 km). Not too far... About 7 hours in 1-G torch travel.Hmm since you mentioned a good jump can actually land a ship in orbit of a target planet, is the gravity well issue with standard 2D6/Traveller jump drives less of an issue here?
Or would a target need to get far away enough still to initiate a jump?