Voyager and Galileo Images of Ganymede, The Ganymede images and mosaics thread |
Voyager and Galileo Images of Ganymede, The Ganymede images and mosaics thread |
May 18 2007, 09:43 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I've been processing some of the high resolution Galileo Ganymede images recently. As far as I know the two mosaics below have not appeared at the official websites (at least not in this form) so in a sense they are 'new'.
The first one was obtained during the G1 flyby in 1996. It covers a part of Memphis Facula which is centered at roughly 15°N, 132°W. The images were obtained at a distance of approximately 5000 km from Ganymede's center. The second one was obtained during the G28 flyby in May 2000. It is centered near 14.5°S, 319.7°W. The images making up the mosaic were obtained at a distance of roughly 4500 km from Ganymede's center. I will probably post more Ganymede mosaics later this month or next month. |
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May 19 2007, 08:51 AM
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
One of the things that seems to happen on Ganymede and even more so on Callisto is the sublimation of ice by "dirty" regolith. Icy dirt gets hot enough in the afternoon to sublimate ice and darken itself. That accelerates the process. At the same time it can tend to creap downslope, tending to thin and expose more ice on elevations and slopes, lightening those surfaces and slowing the ice evaporation process. That seems to be very important in the highest resolution images, from what I've read (and also speculated myself). Callisto high-rez images show the resulting topography best.
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May 19 2007, 03:49 PM
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#3
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Great work! It really is amazing how many good Galileo mosaics/images never became public release products. Here is one from G-2 (use the link for a higher resolution version).
http://www.strykfoto.org/g2-1a.jpg -------------------- |
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May 26 2007, 08:56 PM
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#4
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Junior Member Group: Members Posts: 78 Joined: 29-December 05 Member No.: 623 |
Here is one from G-2 (use the link for a higher resolution version). http://www.strykfoto.org/g2-1a.jpg Here is the context for this G2 palimpsest observation (this palimpsest is now named Epigeus). Every other frame of this observation, too, contains truth windows. This one is a nice complement to the Memphis Facula observation--each shows a transect across the various palimpsest facies. |
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