Anatid/XML-Documentation-for-the-KSP-API — pull request #12 by Starstrider42 (2014-09-18 02:18:29+00:00)
Title: Updated CelestialBody.GetOrbit()

I found out the hard way that the orbit property no longer exists, and CelestialBody.GetOrbit() is broken as of 0.24.2. GetOrbitDriver() is still usable, though.