China to the Moon - Chang'e 1 and 2, Chinese unmanned lunar orbiters |
China to the Moon - Chang'e 1 and 2, Chinese unmanned lunar orbiters |
May 18 2011, 10:14 PM
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#181
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
Several images are here. I guess she meant to say no full resolution images have been released.Emily says in that post with the Chang'E 2 images that "... none of the versions of the images that I have found to be available online are anything close to their full stated resolution." So the quality of any lunar map based on the originals is still unknown. |
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May 18 2011, 10:36 PM
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#182
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I guess she meant to say no full resolution images have been released. Um, yeah, that's what I meant. Actually, to be honest, I had totally forgotten about the release of any images, which is kind of shameful because I blogged them when they came out! -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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May 19 2011, 07:35 AM
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#183
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Junior Member Group: Members Posts: 86 Joined: 12-October 05 From: Beijing Member No.: 526 |
This is a guideline how you can apply for these datasets: http://www.clep.org.cn/index.asp?modelname...000&recno=6 (in Chinese)
Normal users can only download "processed data products" (level-3 datasets) by sign up at http://159.226.88.59:7779/CE1OutWeb/ . For those have cooperation with the program, they can apply for raw datasets (level 0,1,2). |
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Jun 8 2011, 06:52 PM
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#184
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Junior Member Group: Members Posts: 39 Joined: 26-March 09 From: Cornwall Member No.: 4697 |
L2 is not a point - it's a broad region, and the spacecraft orbit loosely around it, almost never hidden by the Moon. Right now NASA's ARTEMIS mission has two spacecraft, one orbiting L1 and one orbiting L2, waiting to go into lunar orbit in a few months for particles and fields studies. Phil According to the current Aviation Week, it's going to the Sun-Earth L2 point, not the Earth-Moon one. As far as I understand the machine-translated original Chinese announcement, this is correct. |
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Jun 9 2011, 03:23 PM
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#185
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
Thanks - that's useful. Same point is true about it bing a large zone rather than a point - in fact it's much larger! What will it do after that, I wonder? Return to Earth orbit or Lunar orbit? Or go further out?
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 PDF: 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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Jun 9 2011, 05:48 PM
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#186
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
In theory, L2 is in fact a point. However, spacecraft never actually 'sit'in this point, but move in large orbits ( http://en.wikipedia.org/wiki/Halo_orbit ) around it. The point itself is dynamically unstable anyway (as opposed to the L4 and L5 points), so it would take effort to maintain your position there. In theory, halo orbits are stable, but in practise they get perturbed.
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Jun 9 2011, 10:02 PM
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#187
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
L2 could be compared to a body, like the Earth, around which objects can orbit. Although the the center of Earth's gravitational field is a point, many objects can orbit it. In the same way, although the center of L2's influence is a point, many objects can orbit it. (That's how I see it anyway.)
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Jun 10 2011, 01:00 AM
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#188
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
I'm kind of wondering why they're going there. Navigation practice is my best guess. Wonder if they ever considered trying for an NEO flyby (assuming that there are any that Chang'e 2 could reach)?
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jun 10 2011, 07:34 AM
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#189
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
My guess is that it's just hitting the highway http://www.cds.caltech.edu/~shane/superhig...escription.html
Also check out the Genesis mission for this. http://www.whydomath.org/node/space/second...ci_genesis.html |
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Jun 10 2011, 05:34 PM
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#190
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Senior Member Group: Members Posts: 1591 Joined: 14-October 05 From: Vermont Member No.: 530 |
Clementine was thinking along the same lines.
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Aug 29 2011, 05:13 PM
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#191
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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Aug 31 2011, 05:08 PM
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#192
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
http://www.chinadaily.com.cn/cndy/2011-08/...nt_13224280.htm
QUOTE "This test will be very meaningful for China's future deep space exploration, as scientists are now discussing ideas of exploring Jupiter and the two poles of the Sun in the future," Oh my... |
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Aug 31 2011, 05:11 PM
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#193
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Scientists discussing something makes it far from certain that that something will actually ever happen. Sadly.
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Sep 1 2011, 11:08 AM
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#194
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
Just published in the latest issue of the Chinese Journal of Space Science the paper Research of lunar tectonic features: Primary results from Chang'E-1 lunar CCD image
the paper itself is in Chinese (but there is a nice English abstract) but it contains quite a few Chang'e 1 pictures that I had never seen before |
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Sep 21 2011, 06:07 PM
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#195
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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