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Chang'e 3: Lunar Day 3 and onwards, Ongoing discussion of the Rover/Lander mission
mcaplinger
post Feb 12 2014, 08:30 PM
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Maybe all those ham radio operators who are complaining about the ISEE-3 situation should try listening for downlink from Yutu instead. rolleyes.gif


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Paolo
post Feb 12 2014, 08:50 PM
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signal from Yutu!
http://pjm.uhf-satcom.com/twtr/yutu_8462077.jpg
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Thorsten Denk
post Feb 12 2014, 09:05 PM
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Great! biggrin.gif

One question, for people (like me) who are not experts
for electronics hardware at low temperatures:
What is the problem with the low temperatures?
What exactly happens, how is the electronics knocked out?
Thanks for the answers.

Thorsten
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mcaplinger
post Feb 12 2014, 09:12 PM
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QUOTE (Thorsten Denk @ Feb 12 2014, 02:05 PM) *
What is the problem with the low temperatures?

Thermal expansion/contraction can break solder joints, internal bond wires, etc.
Some components (e.g., electrolytic capacitors, batteries) have goop that can freeze.

In general it's not that hard to build something that can survive Mars surface temps, but it gets colder and hotter on the Moon, so more stress.


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djellison
post Feb 12 2014, 10:47 PM
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QUOTE (mcaplinger @ Feb 12 2014, 12:30 PM) *
Maybe all those ham radio operators who are complaining about the ISEE-3 situation should try listening for downlink from Yutu instead. rolleyes.gif


They did. With success :-O

Yup - I was surprised as well.

https://twitter.com/uhf_satcom/status/433709448717033472
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mcaplinger
post Feb 12 2014, 10:53 PM
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QUOTE (djellison @ Feb 12 2014, 03:47 PM) *
They did. With success :-O

Detecting a signal is a good deal easier than decoding it, much less generating an uplink, of course.


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Yeh
post Feb 13 2014, 12:17 AM
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CNSA confirmation:

http://www.weibo.com/1488228740/Awubn3MXf

官方消息:探月工程新闻发言人裴照宇昨晚表示,国产玉兔号月球车已全面苏醒,状态趋于好转,但是出现问题的机构仍然有待进一步恢复。只有苏醒了才有排故的时间,希望得到很好的救治和疗养,兔子好好休个假。

CLEP news officer Pei Zhaoyu said the Yutu rover is fully awaken and is getting better, but the mechanical problems are yet to be solved.

UPDATE: CAS official microblogger says the same thing: http://www.weibo.com/3494982177/AwufW7cDi . There is an updated news brief from Xinhua there, but says nothing relevant to the exact problem.
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Hungry4info
post Feb 13 2014, 03:32 AM
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From Xinhua.
China's lunar rover "awakes" despite abnormality: spokesman
"The rover stands a chance of being saved now that it is still alive,"


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elakdawalla
post Feb 13 2014, 04:42 AM
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This came to the Lunar Listserv from Yong-Chun Zheng:
QUOTE
Yesterday night, the Jade Rabbit lunar rover have sent us a good message from the Moon. In the last lunar day for the landing site, the rover met trouble to move on the surface. The control structure of the rover can't function as designed. The rabbit has gone into sleep without protection. Fortunately, our rabbit awakes yesterday with the efforts of the engineers. The instruments on the rover stood up to the challenge of the very low temperature in the lunar night. The rover can recieve the command from the ground station. We have also recieved the the data from the rover. Except some sensitive components, most of the functions of the rover have been recovered. Its experience can contribute much for all future lunar mission, both lander or rover.The lunar and planetary missions are not easy for any country. They always give us joy mingled with surprise. We anticipate the brave Jade Rabbit get new discovery on the Moon. Cheers.


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Explorer1
post Feb 13 2014, 04:58 AM
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It might be possible to make a visual diagnosis of the panel hinges or whatever the jammed part is, given that the lander is operational and still nearby? It all hinges on whether Yutu can drive or not, but it would take out a lot of guesswork on figuring out the issue (Galileo's high gain antenna comes to mind).
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elakdawalla
post Feb 13 2014, 05:36 AM
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Remember that the lander's main camera no longer works -- it failed (as expected) after the first night.


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Explorer1
post Feb 13 2014, 06:21 AM
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Yeah, I heard about the topography camera failure, but we know there were three others on the sides, given those great perspectives on landing day.
I was just thinking of all those other missions with mysterious failures that could have been solved or at least diagnosed by a nearby pair of eyes (or hands with a nice wrench/brush/lubricant)!

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A.Nemo
post Feb 13 2014, 12:00 PM
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QUOTE (Paolo @ Feb 13 2014, 02:27 PM) *
this image from one of the TV reports has been posted on a French forum
http://www.servimg.com/image_preview.php?i...&u=17604920
I think we have never seen it before, and it looks like a perspective from late on the first lunar day

EDIT: I post the image below because I don't trust these image hosting sites...


Yutu Awake, CCTV have reported:
http://news.cntv.cn/2014/02/13/VIDE1392290645405335.shtml

Chang'e-3 have Awaked, too
Attached thumbnail(s)
Attached Image
 
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Thorsten Denk
post Feb 21 2014, 09:29 PM
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Two days from now, on Sunday 23 at 22:20 UT,
will be the third sunset for the two spacecraft.

News from Yt have gone down to zero.
Are there maybe some chinese natives who know more?
If so, please let us know! Thank's a lot! Xixie!

Thorsten
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Paolo
post Feb 21 2014, 09:50 PM
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there was a release in Chinese 2 days ago http://www.chinanews.com/mil/2014/02-19/5856563.shtml
troubleshooting continues. no more details given
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