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There's even a USS Ozark.
[Also a George, but no hhEb09'1, sorry]
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Very close and close enough given the discussion nature of the question. Operation Deepfreeze I saw USS Arneb cross the Artic and Antarctic circles in the same year (first ship to do so). Her trip south stopped in New Zealand - red crux, and Franklin Island (antarctic). Terror and Erebus were the link to Franklin island. Incidentally, and not intended, Terror, Erebus, Crux and Arneb are all Craters of sorts. Crater Cirque is part of th Arneb glacier formation, Erebus and Terror are both volcanic craters, Erebus is also the first crater for Opportunity on Mars and USS Crux is/was Crater class. |
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How far out is a lunar stationary orbit?
PS: Of course, the Earth is in lunar stationary orbit, but I mean, without regard to the Earth. OK, with and without. And earth/moon lagrange points too. Last edited by hhEb09'1; 08-December-2006 at 02:48 AM. |
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Given that a seleno-stationary orbit (ignoring gravitational capture by the earth) would have a period of 27.32 days, around a tichy moon - the distance is going to be a long way!
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Question - did you use the sidereal or synodic period? The moon's rotation is once every 27.32 days. We could also disagree on the mass of the moon.
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That may be 1 second too long. Wikipedia gives 23.321582 days, which is 2,360,584.6848 seconds.
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My answer agrees with Eroica, down to the first place past the decimal (I went a little farther than that, but not two dozen places!). I used the wiki page for mass, and Eroica's derived period, and this wiki page for G.
Notice that that is farther than the Lagrange point, so the Lagrange point, unstable as it is, might make a better lunar stationary point. Eroica's up. PS: I just noticed that your discrepancy is just a bit more than the radius of the moon. Did you measure from the lunar surface, or the center as Eroica did? |