Giotto’s brief encounter, Twenty years ago |
Giotto’s brief encounter, Twenty years ago |
Mar 10 2006, 09:20 AM
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Member Group: Members Posts: 370 Joined: 12-September 05 From: France Member No.: 495 |
Giotto’s brief encounter
http://www.esa.int/esaCP/SEMSZ0NVGJE_index_0.html Twenty years ago, in the night between 13 and 14 March 1986, ESA’s Giotto spacecraft encountered Comet Halley. |
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Nov 8 2007, 04:15 PM
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Solar System Cartographer Group: Members Posts: 10193 Joined: 5-April 05 From: Canada Member No.: 227 |
The Giotto images are very tricky to work with. They are little thumbnail-type images, they are not rectangular. You can't use them for shape modelling without knowing the pointing directions, and you can't know that without knowing the rotation state. It took years to sort that out. A rather dubious shape model is available in PDS. I say dubious because I made it. The fact that nobody has tried to do better than me since then only reinforces how poor the data are. We could really use a close flyby while the nucleus is relatively quiescent, like about now.
My shape is probably too faceted, based on comparisons with Peter Thomas's models of objects I have also done. (His are probably too smooth). Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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