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China to the Moon - Chang'e 1 and 2, Chinese unmanned lunar orbiters
centsworth_II
post May 18 2011, 10:14 PM
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QUOTE (Hungry4info @ May 18 2011, 02:57 PM) *
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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elakdawalla
post May 18 2011, 10:36 PM
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QUOTE (centsworth_II @ May 18 2011, 02:14 PM) *
I guess she meant to say no full resolution images have been released.

Um, yeah, that's what I meant. rolleyes.gif 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!


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yaohua2000
post May 19 2011, 07:35 AM
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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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gwiz
post Jun 8 2011, 06:52 PM
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QUOTE (Phil Stooke @ May 18 2011, 06:23 PM) *
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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Phil Stooke
post Jun 9 2011, 03:23 PM
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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


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remcook
post Jun 9 2011, 05:48 PM
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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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centsworth_II
post Jun 9 2011, 10:02 PM
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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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nprev
post Jun 10 2011, 01:00 AM
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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)?


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remcook
post Jun 10 2011, 07:34 AM
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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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stevesliva
post Jun 10 2011, 05:34 PM
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Clementine was thinking along the same lines.
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Paolo
post Aug 29 2011, 05:13 PM
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Chang'e 2 has reached L2
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Paolo
post Aug 31 2011, 05:08 PM
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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... ohmy.gif
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ugordan
post Aug 31 2011, 05:11 PM
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Scientists discussing something makes it far from certain that that something will actually ever happen. Sadly.


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Paolo
post Sep 1 2011, 11:08 AM
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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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Paolo
post Sep 21 2011, 06:07 PM
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an update on Chang'e 2:
China's second moon orbiter Chang'e-2 sends data from 1.7 mln km away
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