Chang'e 3: Lunar Day 3 and onwards, Ongoing discussion of the Rover/Lander mission |
Chang'e 3: Lunar Day 3 and onwards, Ongoing discussion of the Rover/Lander mission |
Feb 12 2014, 08:30 PM
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#16
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Maybe all those ham radio operators who are complaining about the ISEE-3 situation should try listening for downlink from Yutu instead.
-------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Feb 12 2014, 08:50 PM
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#17
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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 |
signal from Yutu!
http://pjm.uhf-satcom.com/twtr/yutu_8462077.jpg |
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Feb 12 2014, 09:05 PM
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#18
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
Great!
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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Feb 12 2014, 09:12 PM
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#19
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
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. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Feb 12 2014, 10:47 PM
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#20
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
Maybe all those ham radio operators who are complaining about the ISEE-3 situation should try listening for downlink from Yutu instead. They did. With success :-O Yup - I was surprised as well. https://twitter.com/uhf_satcom/status/433709448717033472 |
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Feb 12 2014, 10:53 PM
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#21
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
They did. With success :-O Detecting a signal is a good deal easier than decoding it, much less generating an uplink, of course. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Feb 13 2014, 12:17 AM
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#22
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Newbie Group: Members Posts: 16 Joined: 25-January 14 Member No.: 7109 |
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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Feb 13 2014, 03:32 AM
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#23
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Senior Member Group: Members Posts: 1452 Joined: 26-July 08 Member No.: 4270 |
From Xinhua.
China's lunar rover "awakes" despite abnormality: spokesman "The rover stands a chance of being saved now that it is still alive," -------------------- -- Hungry4info (Sirius_Alpha)
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Feb 13 2014, 04:42 AM
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#24
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
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.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Feb 13 2014, 04:58 AM
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#25
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
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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Feb 13 2014, 05:36 AM
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#26
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Remember that the lander's main camera no longer works -- it failed (as expected) after the first night.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Feb 13 2014, 06:21 AM
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#27
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
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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Feb 13 2014, 12:00 PM
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#28
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Junior Member Group: Members Posts: 31 Joined: 10-January 14 Member No.: 7094 |
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 |
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Feb 21 2014, 09:29 PM
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#29
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
Two days from now, on Sunday 23 at 22:20 UT,
will be the third sunset for the two spacecraft. News from Yùtù have gone down to zero. Are there maybe some chinese natives who know more? If so, please let us know! Thank's a lot! Xièxie! Thorsten |
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Feb 21 2014, 09:50 PM
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#30
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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 |
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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