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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#31
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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 27 2016, 08:29 PM
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#32
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Member Group: Members Posts: 306 Joined: 4-October 14 Member No.: 7273 |
I've finished going through the Voyager 2 narrow-angle data set. The main prize is this 87-frame clear filter mosaic.
I really want to recommend checking out the full-resolution version of this, because it's like getting to see the New Horizons MVIC image of Pluto for the first time all over again! It looks like the imaging team broke down imaging into multiple smaller mosaics with a little bit of overlap. At the rate that Voyager was approaching the moon, I don't think taking the entire mosaic in a single go would have been possible with the huge change in viewing geometry over the three hours it took to acquire all of the imaging data. I started by assembling all of the submosaics, then warping them so that they aligned with one another. This process didn't require too much warping, although it was getting more difficult by the later mosaics. The image resolution is stopped down to the resolution of the first submosaic on Ganymede's limb, and I need to check the ephemerides to calculate what that resolution was. I've also uploaded the submosaics to my flickr page so you can view them all at full resolution - the later mosaics appear to have 2-3x the image resolution. There are a couple other images that didn't fit neatly into this mosaic. There was a UVIS drift sequence, for which ISS rode along to take support imaging. I've tracked down the locations of these frames and written a short description of the terrain in the FOV. Finally, as Voyager 2 began to recede from Ganymede it looked back and took an 11-frame mosaic of the south pole, which is on the terminator about halfway up the image. I really need to figure out how to do better geometric control on these images, because it'd be great to try my hand at colorizing these |
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