Chang'e 3 prelaunch through lunar orbit insertion, Lander instruments, capability, development, testing, launch |
Chang'e 3 prelaunch through lunar orbit insertion, Lander instruments, capability, development, testing, launch |
Oct 29 2013, 01:47 PM
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#61
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Junior Member Group: Members Posts: 86 Joined: 12-October 05 From: Beijing Member No.: 526 |
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Oct 29 2013, 11:45 PM
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#62
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Solar System Cartographer Group: Members Posts: 10122 Joined: 5-April 05 From: Canada Member No.: 227 |
Thanks for the link - I'm sure we all really appreciate your help finding these things. I certainly do. This is going to be an exciting mission.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Oct 30 2013, 05:00 AM
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#63
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
I read at the LROC site that they are looking forward to the Chang'e landing so they can get good "before" images of a landing site as well as "after" images, since they have no such thing at present. They are hoping they have decent resolution imaging of the eventual landing site -- they can't be certain because the Chinese have not specified the exact planned co-ordinates.
-the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Oct 30 2013, 02:21 PM
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#64
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Solar System Cartographer Group: Members Posts: 10122 Joined: 5-April 05 From: Canada Member No.: 227 |
Interesting comment. 'They' at LROC don't have pre-landing images of any other site, of course, but 'we' as a planet do, since there are good Lunar Orbiter images of Apollo 11, 12 and 14 pre-landing, and Apollo images of Apollo 16 and 17 pre-landing, and Lunar Orbiter images of Surveyors 3, 6 and 7 pre-landing. (Only mediocre images of Apollo 15 pre-landing though).
Now LRO is in a higher orbit their post-landing images will be less eye-popping than earlier lander images, too. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Oct 30 2013, 02:59 PM
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#65
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
They appear to be concerned only with LROC NAC imagery in re capturing "before" images. The exact quote from the LROC site is:
"If we are lucky, the LROC team might have a before picture to compare to any after pictures of the Chang'e 3 landing site (the exact planned landing coordinates have not yet been released). Currently all LROC NAC investigations must rely solely on 'after' images of landing sites. Obtaining a before and after set of images of the Chang'e 3 will facilitate a much better understanding of the delicate processes involved in regolith redistribution due to lander rocket plumes." -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Oct 30 2013, 11:14 PM
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#66
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Member Group: Members Posts: 106 Joined: 25-November 04 From: Dublin, Ireland Member No.: 113 |
Does anyone have any insights into the rover deployment sequence?
Early drawings showed it mounted on the side of the lander (LRV-style) and pivoting onto the trackway about 75 cm from the surface, with a shallow incline. A presentation last year by CLEP chief scientist Ouyang Ziyuan seemed to show a fork-lift truck type lift assembly to deliver the rover from atop the lander to the surface. A report last weekend on CNTV showed the rover "walking the plank" Wile E. Coyote-style, with the trackway suspended 2 meters above the surface and ending in mid-air. Clearly, not all depictions are to be trusted! However, the final configuration seems to have the rover mounted atop a circa. 2-meter-tall main bus, with a vertiginous trackway descending in only one direction. Does this not break at least two cardinal rules of rover delivery? 1) Keep your centre of mass low. 2) Give yourself an alternative exit route in case a boulder blocks one pathway. |
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Oct 31 2013, 06:02 PM
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#67
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Solar System Cartographer Group: Members Posts: 10122 Joined: 5-April 05 From: Canada Member No.: 227 |
I can't really answer your question with certainty, but my impression from reviewing many images is that the pictures you refer to are showing different parts of the process. The 'walk the plank' image shows the rover moving onto the 'fork lift' supports. Then it is lowered part way to the surface, from which it rolls off on ramps. Some pictures out there probably show earlier thoughts about deployment.
Only one way off? But large rocks are rare except in fresh crater ejecta, and with hazard avoidance during descent those bad areas can be avoided. The dangers of rover deployment may have been exaggerated in the past. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Oct 31 2013, 06:53 PM
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#68
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Senior Member Group: Members Posts: 2073 Joined: 13-February 10 From: Ontario Member No.: 5221 |
What are the chances they would merely select a site that's already received LROC coverage? It would be both scientifically interesting and surveyed for landing safety: two birds with one stone...
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Oct 31 2013, 07:06 PM
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#69
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Solar System Cartographer Group: Members Posts: 10122 Joined: 5-April 05 From: Canada Member No.: 227 |
Remember they have their own c. 1.5 m/pixel images as well.
As for selecting an area already imaged by LROC, a look at Quickmap suggests most of the likely area is already imaged so it shouldn't be too difficult, but only part of that is imaged at the 0.5 m resolution of the earlier orbits. Now they are in a higher orbit they are getting only ('only'!) 2 m/pixel. Depending on the aiming accuracy, they may not be able to guarantee they will get into a high resolution strip. For reasons of national pride they may be more interested in getting into their own high resolution coverage. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Nov 2 2013, 04:36 AM
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#70
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Senior Member Group: Members Posts: 1413 Joined: 26-July 08 Member No.: 4270 |
Does anyone have any insights into the rover deployment sequence? This video, posted today to YouTube, shows a good view of the set-up at 0:30. The way I understand it, the tracks on the side of the lander extend out and unfold in such a way where the rover will be able to drive off the top. https://www.youtube.com/watch?v=dEd0TljENBc -------------------- -- Hungry4info (Sirius_Alpha)
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Nov 2 2013, 07:25 AM
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#71
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Senior Member Group: Members Posts: 2073 Joined: 13-February 10 From: Ontario Member No.: 5221 |
I would ordinarily say it looks way too complicated with all those moving parts, but in the wake of the skycrane I don't think we can complain.
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Nov 2 2013, 03:40 PM
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#72
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Member Group: Members Posts: 106 Joined: 25-November 04 From: Dublin, Ireland Member No.: 113 |
I draped the annotated map from today's Youtube video over Google Moon (1) and had an interesting, if highly speculative, result when I zoomed in to the right-hand character on the CCTV map and compared it with the CCTV close-up scene(2).
1: 2: Can anyone translate the two single-character labels within Sinus Iridum? Even better, is there anyone who can give a summary translation of relevant parts of the video? The kmg file is here: http://j.mp/CCTV_Map |
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Nov 2 2013, 04:07 PM
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#73
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Solar System Cartographer Group: Members Posts: 10122 Joined: 5-April 05 From: Canada Member No.: 227 |
Hi - check this out:
http://www.planetary.org/blogs/emily-lakda.../2010/2773.html To see where that image really is. We can't assume that the image is the landing site - that was the first high resolution image strip from the Chang'E 2 low orbit, so the most widely seen. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Nov 2 2013, 05:44 PM
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#74
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Member Group: Members Posts: 105 Joined: 27-August 05 Member No.: 479 |
this site and the planetary blog cited in this paper
http://www.aerospaceamerica.org/Documents/...n_AANov2013.pdf |
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Nov 2 2013, 07:42 PM
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#75
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
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