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Chang'e 3 second lunar day of operations
Paolo
post Jan 24 2014, 03:09 PM
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QUOTE (SpaceListener @ Jan 24 2014, 04:03 PM) *
So the Yutu rover won't go so far from the station. So now we already know which interesting places that Yutu's rover can visit, so this is a good point cool.gif


you are neglecting a detail: Yutu also has direct-to-Earth comm capability
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djellison
post Jan 24 2014, 03:34 PM
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UHF is used between MODY/MRO and MER/MSL at Mars, over ranges of hundreds of miles at speeds up to 2 Mbits/sec

The problem would be line of sight over the horizon. But Yutu has DTE, so the issue doesn't actually matter.
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Cosmic Penguin
post Jan 25 2014, 04:01 AM
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Hmm, the rover has problems just before getting into the second lunar night....

QUOTE
China's moon rover monitored with abnormity
English.news.cn 2014-01-25 10:48:05

BEIJING, Jan. 25 (Xinhua) -- China's moon rover "Yutu" (Jade Rabbit) has had an abnormity, and scientists are organizing an overhaul, the State Administration of Science, Technology and Industry for National Defence said on Saturday.


(source)

From what I have read from Chinese sources, it seems that the problem is with the solar arrays failing to tuck back into the rover body for thermal protection during the lunar night. Big oops if that can't be solved in a few (Earth) day's time... ohmy.gif


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nprev
post Jan 25 2014, 05:30 AM
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Yeah, the DTE channel was obvious based on the dish. I just wonder how willing the mission operators are to let Yutu get too far away from the lander since if it gets too far away the UHF option is gone.

This is a first time for them, and really for anyone since 1976 on the Moon since DTE links from pretty much anywhere else don't work for control, merely data return. Not sure what's the priority here: exploration or engineering test. Should become evident over time, of course, but way too early to tell.


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Phil Stooke
post Jan 25 2014, 06:18 AM
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The plan always was to drive several kilometers, up to 10, and they would very soon get out of line of sight given the crater rims etc., so DTE would have to be the main communication method.

My concern right now is that they have very little time to fix this issue with the panel. The sun is about to disappear.

Phil



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Thorsten Denk
post Jan 25 2014, 11:31 AM
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According to this list,
the sun HAS disappeared at 08:35 UTC,
little more than one hour after your post...

O-o... ohmy.gif

Thorsten
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dilo
post Jan 25 2014, 02:00 PM
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Very scaring situation, indeed. sad.gif
PS: correct me if I'm wrong, not a single image was released from 2nd day of activities, up to now...


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kenny
post Jan 25 2014, 03:36 PM
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Ken Kremer has done a rather nice version of the Chang'e 3 lander panorama showing Yutu at 3 different positions. It is a little over 360 degrees.

Ken Kremer Chang'e 3 panorama
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Phil Stooke
post Jan 25 2014, 05:35 PM
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There's still a lot we don't know, but this site:

http://www.gov.cn/jrzg/2014-01/25/content_2575558.htm

says Yutu has been driven over 100 m, so that would be some tens of meters beyond where my map shows it. I still have no indication where it is right now but I would hope that at the very least it had examined the large rock and maybe driven north from there a little way.

Phil


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dilo
post Jan 25 2014, 05:50 PM
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QUOTE (kenny @ Jan 25 2014, 04:36 PM) *
Ken Kremer has done a rather nice version of the Chang'e 3 lander panorama showing Yutu at 3 different positions. It is a little over 360 degrees.

And if you look carefully to credits, I am the other guy! wink.gif


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Explorer1
post Jan 25 2014, 10:49 PM
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If the issue is some stuck motor, there might still be hope to survive the night. Perhaps the temperature changes might loosen whatever component is jammed and the panels can be folded in before too much damage is done (sort of like one of the strategies for Galileo's HGA deployment). That's assuming there's enough juice left to to receive commands and actually follow them...
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general
post Jan 26 2014, 08:10 AM
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http://www.scmp.com/news/china/article/141...ces-abnormality


Very few details about the mishap, but...

...Professor Jiao Weixin , deputy director of the China Society of Space Research's space probe committee, said it was surprising that problems should occur so soon.
"Despite some minor problems, Opportunity, the US Mars rover that also had a design lifespan of three months, is still working after almost 10 years," Jiao said.
"It is quite surprising that Yutu should experience problems at such an early stage."

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Paolo
post Jan 26 2014, 08:54 AM
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A preprint which appeared online a few days ago: Geologic characteristics of the Chang’E-3 exploration region
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DDAVIS
post Jan 26 2014, 11:15 AM
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Here is my version of that initial elevated pan from the lander.

-DD-

http://planetary.s3.amazonaws.com/assets/i...TULNDRPANDD.jpg

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kenny
post Jan 26 2014, 12:07 PM
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QUOTE (dilo @ Jan 25 2014, 05:50 PM) *
And if you look carefully to credits, I am the other guy! wink.gif


Sorry Dilo! I should have noticed that ..... very nice work. And I see you avoided putting in the same rock twice, which others did!
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