 Help., Any Physisists, I need your help. |
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 Dec 9 2004, 04:00 AM
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#26
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Runner  Group: Members Posts: 2,901 Joined: 19-June 03 Member No.: 4,775  |
Marathon reference.
Because I got a shotgun and you don't got one. |
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Dec 9 2004, 04:07 AM
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#27
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Manus Celer Dei Group: Dumpshocked Posts: 17,012 Joined: 30-December 02 From: Boston Member No.: 3,802 |
Do you know what kind of hat I'm wearing?
A party hat; you don't get one. An honor will this party be, a party in your honor, for your honor. Some of Tfear's personal guards are going to be there. You'll be introduced shortly. Prepare to die. ~J |
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Dec 9 2004, 04:07 AM
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#28
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Runner Group: Members Posts: 2,751 Joined: 8-August 03 From: Neighbor of the Beast Member No.: 5,375 |
I say again, "Erm...what?"
Marathon as in "The Battle of...?" Is it anime? What shotgun, dude? Edit: Oh. |
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Dec 9 2004, 04:13 AM
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#29
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Manus Celer Dei Group: Dumpshocked Posts: 17,012 Joined: 30-December 02 From: Boston Member No.: 3,802 |
All roads lead to Sol.
~J |
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Dec 9 2004, 04:29 AM
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#30
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Running Target Group: Members Posts: 1,028 Joined: 9-November 02 From: The Republic of Vermont Member No.: 3,581 |
Close orbit around Luna is tricky, because Luna's density is sufficiently irregular to produce significant differences in its gravitational field from point to point in a circular orbit. That pretty quickly makes the orbit non-circular, and eventually results in the satellite either smacking into the moon or escaping completely. Lunar orbiters that have to stay up for more than a few dozen orbits have to make periodic adjustment burns to maintain their orbits. The further out the orbit is, the less of a problem that is, but if you're too far out, Earth becomes an even bigger problem. Phobos's mean radius is about 11km (I think the 13.5km Kanada Ten is using is the long axis... the thing's not even close to being round). Luna's mean radius is 1737km. In either lunar orbit or at the Earth-Luna L4 or L5 points, it'd have the same average distance from Earth as Luna, so figuring its apparent size is straightforward division. Phobos is about 1/150th Luna's diameter, so, at the same distance, it'd appear about 1/150th as wide. You can eyeball that next full moon, or figure if Luna's half a degree across, Phobos would be... about 12 arc-seconds. |
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