APOD and General Astronomy Discussion Forum
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by makc » Thu Feb 09, 2006 7:04 am
fastartceetoo wrote:But who *chose* the picture for use in APOD, and was it a *good* choice?
by harry » Thu Feb 09, 2006 5:36 am
by fastartceetoo » Wed Feb 08, 2006 6:59 pm
makc wrote:fastartceetoo wrote:I expect more of the moderator than this nonsense.Like I'm the one who makes pictures. I would actually use this kind of stuff to make those pictures.
fastartceetoo wrote:I expect more of the moderator than this nonsense.
by kovil » Wed Feb 08, 2006 3:28 pm
by orin stepanek » Wed Feb 08, 2006 1:30 pm
by makc » Wed Feb 08, 2006 8:09 am
by harry » Wed Feb 08, 2006 8:02 am
by makc » Wed Feb 08, 2006 8:00 am
by kovil » Tue Feb 07, 2006 5:23 pm
by fastartceetoo » Tue Feb 07, 2006 5:00 pm
by orin stepanek » Tue Feb 07, 2006 3:10 pm
by borealis » Tue Feb 07, 2006 2:55 pm
by thomasm@cadence.com » Tue Feb 07, 2006 2:54 pm
by makc » Tue Feb 07, 2006 7:07 am
barakn wrote:The entire night side of the "planet" is brightly and evenly backlit
Zaha wrote:At 100AU from Sun, the planet receives 1/10000 of the sunlight intensity Earth does. By comparison, the Sun's apparent magnitude on Earth is -26.7 and full Moon's -12.6, therefore we have by the definition of magnitude that Sun is 100^(26.7-12.6)/5) = 437000 times as bright as the full Moon. So an object at 100AU is 43.7 times brighter than Earth in full Moon's light, and as humans can see quite well (even colors) in good direct moonlight they would see the object fairly well lit with eyes adapted to dark. With long enough exposures, it might even be possible to photograph the dark side in just starlight (even better if the object is illuminated by its own moon too) - though not in the same picture with the sunlit side.
by barakn » Tue Feb 07, 2006 6:54 am
by jtheywood » Tue Feb 07, 2006 5:49 am
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