October 13, 2008
I don't think that Phobos or Deimos look anything like that.
Just did some calculations. At its closest approach, when directly overhead, Phobos has a disc of 0.2 degrees. From earth, Luna is a disk of about 0.5 degrees.
But because Phobos has a smaller orbit, then when it's on the horizon its disk would be about 0.15 degrees, or about one eleventh the area. Visible? Yeah. But it wouldn't look like that image.
And since its orbital period is only 7 hours, it would visibly move.
OK, Steve, put down that slide rule and back away slowly...
UPDATE: Not only would Phobos have only 1/11th of the apparent disc, but illumination by the sun would be 43% as bright on average, which means as a night-sky light illuminating things on the ground, Phobos would only cast 4% of the amount of light that Luna does on "Manhome" when full.
Posted by: metaphysician at October 13, 2008 06:03 PM (h4nEy)
Posted by: Wonderduck at October 13, 2008 07:12 PM (AW3EJ)
Posted by: Avatar_exADV at October 13, 2008 07:30 PM (pfysU)
Posted by: Jeremy Bowers at October 13, 2008 07:43 PM (7LWnd)
Posted by: Steven Den Beste at October 13, 2008 07:50 PM (+rSRq)
Posted by: Jeremy Bowers at October 14, 2008 09:53 AM (FXfNF)
Posted by: Steven Den Beste at October 14, 2008 11:54 AM (+rSRq)
Enclose all spoilers in spoiler tags:
[spoiler]your spoiler here[/spoiler]
Spoilers which are not properly tagged will be ruthlessly deleted on sight.
Also, I hate unsolicited suggestions and advice. (Even when you think you're being funny.)
At Chizumatic, we take pride in being incomplete, incorrect, inconsistent, and unfair. We do all of them deliberately.
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