KAGUYA lunar explorer (aka SELENE) |
KAGUYA lunar explorer (aka SELENE) |
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#1
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![]() Member ![]() ![]() ![]() Group: Members Posts: 370 Joined: 12-September 05 From: France Member No.: 495 ![]() |
SELENE has now a nickname : KAGUYA.
http://www.jaxa.jp/topics/2007/06_e.html Edit : And Emily searched for the origin of the name http://www.planetary.org/blog/article/00000996/ |
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#2
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 ![]() |
It's probably not really difficult to maintain a 10 or 15 km lunar orbit. You need 2 things.. maybe 3.
1.) A GOOD gravity model, reasonably high resolution, including the farside. You need to predict the exact spacecraft trajectory several orbits in advance to 1 km or better accuracy. 2.) Good tracking to verify what's the real orbit as opposed to the predict. A real-time engineering-ops lidar or RF altimiter wouldn't hurt. 3.) A propulsion system, maybe ion, maybe hypergolics running low thrust engines You simply need to design a vehicle that will do an orbit trim maneuver or two every orbit. Just a 1/2 km tweek... just keep it circular within a small amount. |
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