Dawn's Survey Orbit at Ceres |
Dawn's Survey Orbit at Ceres |
Jun 15 2015, 05:47 PM
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#1
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
daily Ceres picture from the survey orbit
http://dawn.jpl.nasa.gov/multimedia/images...tml?id=PIA19572 I started a new topic, as we are no longer in the first orbit phase |
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Jun 23 2015, 04:52 PM
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#2
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Member Group: Members Posts: 102 Joined: 8-August 12 Member No.: 6511 |
Something I haven't seen discussed yet: are we seeing any evidence of volatile transport? Ceres regularly warms up to over 200 K in middle and lower latitudes, and at those temperatures water and carbon dioxide ices will have significant vapor pressure. Most volatiles at or near the surface would quickly sublimate and be lost to space, but some might accrete in cold traps -- and there might be ice not far below the surface.
So, first, is there any indication yet of subsidence or other effects that might be attributed to the sublimation of subsurface volatiles over geologic time? And second, is there any sign yet of ice in cold traps? (We didn't find any on Vesta, but Vesta has a large axial tilt -- 27 degrees -- while Ceres has hardly any. And if surface ice can survive on the Moon and Mercury...) Doug M. |
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