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Chang'e-4 farside landing mission
Phil Stooke
post Jun 13 2019, 08:14 PM
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Woohoo! (to coin a phrase). Check this out:

https://www.hou.usra.edu/meetings/planetdat...19/pdf/7030.pdf

An abstract for the Planetary Data meeting with a map of Yutu 2's path and other information.

Phil



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Phil Stooke
post Jun 13 2019, 10:59 PM
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Meeting abstracts are here:

https://www.hou.usra.edu/meetings/planetdat...ram.htm#sess101

Phil


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Phil Stooke
post Jun 14 2019, 05:35 PM
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This is the map from the abstract (hopefully considered 'fair use' for educational purposes). It is an excellent illustration of how the rover is driven, not with a 'joystick' controller and live (slow-frame) TV like the Lunokhods, but by mapping a safe route from end-of-drive images like the various Mars rovers. Sites are labelled, so I will be updating the route map soon.

Phil

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John Moore
post Jun 20 2019, 02:23 PM
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Below, an attempt to match the doughnut track positions to Phil's map. But don't take them as literal, as with most tracks, they all look the same, so open to correction (it all has to do with viewing/estimating the angles between each doughnut track - some approach angles under 90 degrees, others over 90, not to mention the paths taken, where some are straight-like, some curvable).

John
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Phil Stooke
post Jun 26 2019, 05:36 PM
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That looks good, John.

Several new images were tweeted by Andrew Jones.

https://twitter.com/AJ_FI/status/1143769296973291521


Here I have reprojected them to make it easier for me to compare with a map, but so far I don't have good matches to locations for them. They suggest that the rover moved a bit to the west and then turned south during day 6 (so a map revision is needed), but I don't know enough to draw the route yet.

The article linked by Andrew says (according to Google Translate) that there were control problems during day 6 caused - apparently - by a single bit flip error on a chip. The Mars rovers have seen these occasionally and recovered. They are caused by cosmic ray strikes. Yutu 2 has been recovered successfully.

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EDIT: I replaced the middle image with a different version. The orientation is changed, but please bear in mind that these Hazcam images have a wider field of view than I show here.


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John Moore
post Jun 27 2019, 10:56 AM
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When I first saw the left-most image, Phil, I immediately thought 'Oh, that doesn't look good - some kind of surface-gripping struggle going on there.' But then thought that perhaps the rover was just doing more than one pivot on its axis as it planned its next route.

Btw, the doughnut images are probably wrong, as while the date they appear publicly are always out by several earth days to weeks, the actual lunar day date that they were taken is tricky to pin down (of course, CLEP, has that data).

John
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charborob
post Jul 2 2019, 03:06 PM
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Two images of the lunar surface on the CNSA page.
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Phil Stooke
post Jul 9 2019, 07:29 PM
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Andrew Jones tweets two new images:

https://twitter.com/AJ_FI/status/1148511189216956416

They can be fitted together to make a mini-panorama:

Attached Image


(here with some contrast enhancement).

And that can be roughly reprojected to give a more map-like view:

Attached Image


The lighting is around noon, so the rover may have travelled further since they were taken. No details on the distance travelled yet.

Phil



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Phil Stooke
post Jul 9 2019, 08:24 PM
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That last view with the 6th night location shown.

Phil

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Phil Stooke
post Jul 16 2019, 03:40 AM
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A new paper on topo mapping of the landing site:

http://www.pmrslab.cn/publications/publica...3-1383-2019.pdf

Here is a very small panorama from it (I have cleaned up some glare in it):

Attached Image


and a circular version for mapping:

Attached Image


These are from the end of lunar day 1.

Phil


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