KAGUYA lunar explorer (aka SELENE) |
KAGUYA lunar explorer (aka SELENE) |
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#101
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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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Post
#102
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Rover Driver ![]() ![]() ![]() ![]() Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 ![]() |
I'm not so sure about the 'frozen orbits'. I could be wrong - I seem to remember being wrong once... - but here, I think this is probably talking about the orbit plane being fixed with respect to the sun, so you have the same surface illumination all the time. Certain inclinations and orbit shapes give just the right combination of gravitational effects that the orbit is always, let's say, 15 degrees from the terminator. Judging from the link above it seems that these frozen orbits are different from sunsynchronous orbits of which Phil is speaking. J2 seems quite small for the moon, so I'm not sure sunsynchronous orbits are even possible for the moon. It looks like frozen orbit means that the lumpy gravity field will give nudges to the orbit that are not unstable in these cases. |
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