Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015 |
Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015 |
Mar 6 2015, 03:23 PM
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#1
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Member Group: Members Posts: 205 Joined: 14-April 06 From: Seattle, WA Member No.: 745 |
Dawn is now officially in orbit around (1) Ceres!
Congratulations, NASA. Nice images of crescent Ceres. NASA Spacecraft Becomes First to Orbit a Dwarf Planet |
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Apr 21 2015, 03:48 AM
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#2
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
The fact that these things were visible from Earth still blows my mind. How small would they have to be before we get in the range of an Enceladean albedo?
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Apr 21 2015, 02:11 PM
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#3
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Junior Member Group: Members Posts: 68 Joined: 27-March 15 Member No.: 7426 |
The fact that these things were visible from Earth still blows my mind. How small would they have to be before we get in the range of an Enceladean albedo? Well, it appears that the ratio of an area 3.7 kilometers in diameter to one that is 1.3 km across is about 8.1 to 1. I'm assuming that albedo is inversely proportional to reflective area. If I'm not mistaken, one could multiply the old albedo figure of 0.4 by the 8.1 ratio to get the minimum new albedo. |
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