Author Topic: LIVE: Chang'e-2 (China's second lunar probe) - Long March 3C - October 1, 2010  (Read 192709 times)

Offline luhai167

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interesting: if I correctly understand this abstract (the full paper is in Chinese), solar sailing attitude control was tested when CE-2 was stationed at L2
http://zgkj.cast.cn/EN/abstract/abstract10662.shtml

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Momentum Management of Chang'e-2 Satellite on L2 Point
DAI  Ju-Feng1, XU  Hong-Bing2, CUI  Yan2, XUE  Rui1

Abstract
Since Chang'e-2 (CE-2) satellite entered the Lissajous orbit surrounding the Earth-Sun Lagrange point L2,the effect of jet uninstall was studied. A momentum management method by light pressure was given. The in orbit test shows that the Solar light pressure is strong enough to unload the momentum of CE-2 satellite, which is surrounding the L2 point. This method can substantially reduce the number of jet uninstall, and benefit the orbit maintenance of CE-2 satellite.

I quickly scan the article in Chinese, it's basically characterization of light pressure using the solar panels of CE2 at L2. Basically the movements of CE2 matches the existing model, and the model can be used for future developments and techniques.

Offline plutogno

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the latest issue (5 2013) of SCIENCE CHINA Technological Sciences
http://tech.scichina.com:8082/sciE/CN/volumn/current.shtml
has a bunch of papers (in Chinese) on the CE-2 flyby of Toutatis.
nothing yet on the English version of the journal
http://tech.scichina.com:8082/sciEe/EN/volumn/current.shtml

Offline plutogno

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another batch of CE-2 related papers in Chinese
tech.scichina.com:8082/sciE/CN/volumn/volumn_6667.shtml
note in particular the paper on page 596 where if I understand it correctly they imply that CE-2 came to within 1.32 km of Toutatis!

Offline plutogno

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and yet more papers
http://tech.scichina.com:8082/sciE/CN/volumn/volumn_6684.shtml
these look like engineering papers, and they don't seem to have even just an English abstract

Offline beidou

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CE-2 is about 65 million-kilometer from the Earth, and it's now actually a planet in the Solar System.

http://bbs.9ifly.cn/forum.php?mod=redirect&goto=findpost&ptid=9843&pid=280499&fromuid=24484 

Offline plutogno

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a paper on the future orbit of CE-2, due for publication in the Chinese Science Bulletin: The Earth co-orbital motion and recapture of the Chang'e-2 spacecraft
« Last Edit: 04/10/2014 05:31 PM by plutogno »

Offline plutogno

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this was just published online in Advances in Space Research (and, incredibly for Elsevier, seems to be in open access): Navigation of Chang’E-2 asteroid exploration mission and the minimum distance estimation during its fly-by of Toutatis
from a first, quick look, lots of interesting infos not published elsewhere:
- a detailed timeline of the corrections maneuvers leading to the flyby
- the targeted flyby distance was approx. 30 km but CE-2 ended being much closer (less than 2 km) to Toutatis
- distant images of the Earth and Moon were taken after departure, on 31 July and 1 August 2012. apparently, these were taken to test the camera (the CMOS monitoring camera used during the flyby, I suspect). it would be nice to see these images...

Offline Satori

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Offline wally

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Anyone knows if this probe is still active?

Offline limen4

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Anyone knows if this probe is still active?

A presentation from Feb 2015 given by China National Space Administration is saying: "Chang’e 2 has flown for 4 years on orbit. Now it has become an artificial satellite of the sun." Sounds like the probe is not active since late 2014.

Offline Satori

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Offline plutogno

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China's Chang'e-2 a success: expert.

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It has completed over 200 million kilometers flight and will continue to fly, returning somewhere closer to the earth around 2029

it would have been nice to know whether it is still working and transmitting or not

Offline gwiz

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It's certainly not the smallest "man-made asteroid".  There are quite a few smaller payloads, eg the 6 kg Pioneer 4, and even smaller bits of debris like de-spin cables.

Congrat!