Rosetta - Early Orbital Operations at Comet 67P C-G, August 6, 2014 - November 13, 2014 |
Rosetta - Early Orbital Operations at Comet 67P C-G, August 6, 2014 - November 13, 2014 |
Aug 6 2014, 10:40 PM
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#46
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... 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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Aug 7 2014, 12:41 AM
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#47
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Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
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Aug 7 2014, 01:24 AM
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#48
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Junior Member Group: Members Posts: 20 Joined: 4-August 14 From: St. Louis, Missouri Member No.: 7230 |
It would appear that the neck is an "erosional" feature (not sure if erosion is the right word), and maybe not the contact boundary between 2 separate bodies. At some point in the future, the neck will sublime away and the comet will split in two. Long time lurker here jumping into the discussion of this strange object. I agree and have thought for several days now that 67P/C-G just didn't look right to be a contact binary. Looking at several of the recent highest resolution images, there are large-scale features in the 'neck' area which appear to be somewhat contiguous from the 'head' to the 'body'. These appear to exhibit similar types of features and textures as is seen in both lobes i.e. https://pbs.twimg.com/media/BuWJaVSIcAAVgZ9.jpg:large I think a contact binary resulting from a low-speed impact of 2 bodies and subsequent gap infilling with loose material may not likely exhibit features like those seen... somewhat linear and contiguous higher density erosion resistant features and surfaces. Jets of dust in the long exposure image seem to be emanating primarily from the neck area; likely from the higher albedo areas. If the neck resulted from increased ablation rates in this area of an assumed initial single somewhat spherical cometary body, quite a bit of material has been lost compared to the 2 lobes. On the other hand, 103P/Hartley and 19/P Borrelly, both of which had a bowling pin shape had jets emanating primarily from the lobes. |
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Aug 7 2014, 01:31 AM
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#49
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Junior Member Group: Members Posts: 20 Joined: 4-August 14 From: St. Louis, Missouri Member No.: 7230 |
The 3D image is absolutely incredible! I hope that models are eventually made for educational purposes. Would be cool to have on a desk stand.
Even cooler would be a mobile of all spacecraft-visited comets. http://www.unmannedspaceflight.com/index.p...st&id=33441 |
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Aug 7 2014, 02:42 AM
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#50
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Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
What a strange object.
Reminds me of a broken Wasp Nest. |
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Aug 7 2014, 05:09 AM
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#51
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
The 3D image is absolutely incredible! I hope that models are eventually made for educational purposes. Once shape-file data is out there, I'll certainly make a 3D printable STL file that people can get printed at Shapeways or other 3D printing sites. I've already done Eros, Itokawa and Vesta ( and others ) http://nasa3d.arc.nasa.gov/search/ellison/model |
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Aug 7 2014, 05:30 AM
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#52
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
"On the other hand, 103P/Hartley and 19/P Borrelly, both of which had a bowling pin shape had jets emanating primarily from the lobes. "
Not Borrelly. Its main jets were from the central smooth area. http://nmp.jpl.nasa.gov/ds1/img/borrelly_3.jpg 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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Aug 7 2014, 05:58 AM
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#53
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Member Group: Members Posts: 238 Joined: 28-October 12 Member No.: 6732 |
Some are pointed at the ground, but others are horizontal, Huygens style. See https://www.youtube.com/watch?v=k1IFU6kxcD8 ÇIVA-P cameras are inclined downward. You could see the local horizon, but if they "land in one of those green spots closer to the neck of the comet" you would not be able to see "the other half of the comet looming overhead". |
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Aug 7 2014, 06:42 AM
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#54
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Junior Member Group: Members Posts: 39 Joined: 9-August 12 From: London, UK Member No.: 6521 |
Once shape-file data is out there, I'll certainly make a 3D printable STL file that people can get printed at Shapeways or other 3D printing sites. I've already done Eros, Itokawa and Vesta ( and others ) http://nasa3d.arc.nasa.gov/search/ellison/model They look good, Doug. Do you provide textures and are the models u-v'd or are they just for printing? I should say I don't often have the time to post here, mostly lurking, but this mission is amazing, living up to all the promise and more. I remember sticking it in the calendar back at the launch date telling myself not to get hopes up too high as there were so many risks to overcome, but kudos to everyone involved in this one. - Michael |
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Aug 7 2014, 06:55 AM
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#55
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Senior Member Group: Members Posts: 2082 Joined: 13-February 10 From: Ontario Member No.: 5221 |
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Aug 7 2014, 10:15 AM
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#56
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Descent imaging by ROLIS is limited by onboard memory. So plan is that ROLIS will take few pictures after release from the orbiter, those will be immediately transfered to the orbiter and
then erased. FOV size is easy to find, because if you know distance, you now FOV size on comet. From distance 1000 meters FOV diameter is 1000 meters and resolution is ~1 meter. Before touchdown ROLIS will take up to 8 images from maximum distance 25-50 meters (FOV 25-50 meters). Only few last images will be better in terms of resolution than best possible images from OSIRIS camera. CIVA has 60° FOV. Its cameras has FOV tilted down by 15° (25° for stereo camera) from the Philae's baseplate ("horizontal" plane). So it can see ~270 meters high peaks in distance 1000 meters (this of course depends on actual tilt of the lander). Source: Space Science Reviews 128. -------------------- |
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Aug 7 2014, 01:24 PM
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#57
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Junior Member Group: Members Posts: 95 Joined: 5-September 07 Member No.: 3662 |
Once shape-file data is out there, I'll certainly make a 3D printable STL file that people can get printed at Shapeways or other 3D printing sites. I've already done Eros, Itokawa and Vesta ( and others ) http://nasa3d.arc.nasa.gov/search/ellison/model Any chance of Gaspra? I did some work on that back before the Galileo flyby; it would be great to print it out. Thanks! Jeff |
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Aug 7 2014, 02:57 PM
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#58
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Junior Member Group: Members Posts: 20 Joined: 4-August 14 From: St. Louis, Missouri Member No.: 7230 |
New images are up:
http://blogs.esa.int/rosetta/2014/08/07/co...tch-5-6-august/ |
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Aug 7 2014, 04:13 PM
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#59
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Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
The closeup is what got my attention.
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Aug 7 2014, 08:13 PM
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#60
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Newbie Group: Members Posts: 6 Joined: 22-October 09 Member No.: 4990 |
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