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#1
November 27th 08, 06:17 PM
posted to alt.astronomy
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Red Dwarf @ 5000AU
Yah, I was thinkin' there could be a red dwarf at 5000 AU... figuring
the dwarf might be 100th as bright as the Sun. that's why Jupiter isn't so bright... Jupe's got a cross section 100X of Venus but it's at least 8 AU away presently and Venus is 1/3 AU or so. So, lessee, 24 squared is... ballpark 625. Well, I wuz gonna add in the dimunition of light being sent to Jupiter from the Sun and the fall off of brightness reflected back from Jupiter... but I can't get it to add up! Put Venus at 2/3 AU... 12 squared, inverted, 100 div by 144... 0.7... and on the way back ...0.7 == .49 relative apparent brightness for Jupe [comp to Ven]. woops, the men in white coats are coming! 
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#2
December 2nd 08, 02:50 AM
posted to alt.astronomy
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Red Dwarf @ 5000AU
Theresa McCarty wrote:
Yah, I was thinkin' there could be a red dwarf at 5000 AU... figuring the dwarf might be 100th as bright as the Sun. that's why Jupiter isn't so bright... Jupe's got a cross section 100X of Venus but it's at least 8 AU away presently and Venus is 1/3 AU or so. So, lessee, 24 squared is... ballpark 625. Well, I wuz gonna add in the dimunition of light being sent to Jupiter from the Sun and the fall off of brightness reflected back from Jupiter... but I can't get it to add up! Put Venus at 2/3 AU... 12 squared, inverted, 100 div by 144... 0.7... and on the way back ...0.7 == .49 relative apparent brightness for Jupe [comp to Ven]. woops, the men in white coats are coming! Time, Theresa . . . time. -- ah
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