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Thanks for taking a look. It doesn't surprise me that Orbiter doesn't model precession for lunar orbits since lunar gravity is so lumpy and lunar orbits are not very frequently modeled. My hope was that an orbit at 86º would be more stable since it is mentioned as one of the frozen orbits...

The tricky bit in having a low lunar orbit is dealing with mass concentrations (mascons). As part of Apollo 16, the satellite PFS-2 was put in orbit around the moon to measure charged particles and magnetic fields. This satellite crashed into the moon just 35 days later because lunar...

I've been trying to see if there's a way to make custom markers for vessels or parts of a vessel. This would allow the location of the vessel to be seen when zoomed really far out. Just adding MarkerPath to the vessel's config file doesn't work as this is not a valid config option for vessels...

GMAT has released their beta version! Here's the souceforge page: http://gmat.sourceforge.net/blog/ Here's the NASA link: http://gmat.gsfc.nasa.gov/ Here are the release notes: http://gmat.sourceforge.net/docs/R2012a/html/ReleaseNotesR2012a.html