Chang'e 3 second lunar day of operations |
Chang'e 3 second lunar day of operations |
Jan 24 2014, 03:09 PM
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#31
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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 |
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Jan 24 2014, 03:34 PM
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#32
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
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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Jan 25 2014, 04:01 AM
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#33
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Junior Member Group: Members Posts: 64 Joined: 15-June 12 From: Hong Kong Member No.: 6419 |
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... -------------------- UMSF - the place of Opportunity to satisfy your Spirit of Curiosity via Perseverance
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Jan 25 2014, 05:30 AM
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#34
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
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. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jan 25 2014, 06:18 AM
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#35
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
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 -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 25 2014, 11:31 AM
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#36
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Member Group: Members Posts: 122 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
According to this list,
the sun HAS disappeared at 08:35 UTC, little more than one hour after your post... O-o... Thorsten |
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Jan 25 2014, 02:00 PM
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#37
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Very scaring situation, indeed.
PS: correct me if I'm wrong, not a single image was released from 2nd day of activities, up to now... -------------------- I always think before posting! - Marco -
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Jan 25 2014, 03:36 PM
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#38
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Member Group: Members Posts: 547 Joined: 1-May 06 From: Scotland (Ecosse, Escocia) Member No.: 759 |
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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Jan 25 2014, 05:35 PM
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#39
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Solar System Cartographer Group: Members Posts: 10151 Joined: 5-April 05 From: Canada Member No.: 227 |
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 -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 25 2014, 05:50 PM
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#40
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
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! -------------------- I always think before posting! - Marco -
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Jan 25 2014, 10:49 PM
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#41
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Senior Member Group: Members Posts: 2082 Joined: 13-February 10 From: Ontario Member No.: 5221 |
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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Jan 26 2014, 08:10 AM
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#42
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Member Group: Members Posts: 236 Joined: 21-June 05 Member No.: 417 |
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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Jan 26 2014, 08:54 AM
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#43
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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 |
A preprint which appeared online a few days ago: Geologic characteristics of the Chang’E-3 exploration region
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Jan 26 2014, 11:15 AM
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#44
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Member Group: Members Posts: 194 Joined: 8-February 04 Member No.: 10 |
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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Jan 26 2014, 12:07 PM
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#45
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Member Group: Members Posts: 547 Joined: 1-May 06 From: Scotland (Ecosse, Escocia) Member No.: 759 |
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