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Unmanned Spaceflight.com > Earth & Moon > Lunar Exploration > Chang'e program
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marsbug
In English 'gel' is something that is mostly liquid by weight, but behaves much like a solid due to a scaffold of long molecules runningthrough it... My memory of that definition may be off but my point it is that in English that word refers to a specific state of matter. Is it possible that, in Chinese, the word or phrase is more nubulously defined, or more descriptive of appearance than material state? I can imagine impact glass looks my gel like. I could also imagine a 'glass gel' of an impure glassy (by which I just mean non crystalline) material mixed with crystalline materials that might qualify as 'gel like' in another language, or specific context.
dudley
The Chinese language appears to have distinct, specific words for both 'glass' and 'gel'--' boli' and 'ning jiao' respectively. They seem to mean the same, specific things that we do, when we use the words 'glass' and 'gel'.
Phil Stooke
Nevertheless, this report is not from scientists but via a journalist or media outreach person working with the mission. Blobs of impact glass were seen by every Apollo mission and there is no other reasonable interpretation of this, as far as I am concerned. We may have to wait for a journal paper to know more, maybe in a few months.

Phil
nprev
Agreed.

Furthermore, the difficulties of translation from Chinese dialects to English and vice versa are many, and that fact is rather well-known. Those become compounded if idiom is involved, or even many adjectives. But this case doesn't really seem that complicated. I can easily see how amorphous melt glass might be described as gel-like in appearance.

Bottom line is no, Chang'e-4 has not found jelly on the Moon. rolleyes.gif
atomoid
We'll have to wait. For now im holding out hope for some forbidden moon gummies, even if moon pie bites may be s'more fun tongue.gif
Phil Stooke
post 2287 on this forum page:

http://www.9ifly.cn/thread-5819-115-1.html

gives a summary of the mission including confirming what I had thought, that in May autonomous hazard detection and avoidance was tested on Yutu 2. It includes two images of a route map which I will se to update our map, when I can get to it (I'm on the road at the moment).

Phil
Phil Stooke
Andrew Jones directed me to this drive diary for the 9th day:

https://mp.weixin.qq.com/s/NAm3JQHLJymMOofpGX4pHQ

It includes a mosaic which can be roughly reprojected to give this:

Click to view attachment

The day 9 tracks are at left. The diary describes efforts to analyze the odd material in the crater (open in Chrome for a rough translation).

Here I show an interpretation of the pattern of tracks. Not sure I have it right. The mosaic is from the end of day 9.

Click to view attachment

Map update will follow when I can get to it (I'm on vacation in Brittany)

Phil
John Moore
I'll assume that the first image below is a track-image of where Yutu-2 pulled back (because of the first VNIS wasn't suitable), and then progressed forwards to conduct a second view as highlighted below in the second image (colouration is simply for clarification of the area concerned).

John





Also, I'm assuming, the highlighted sector (on left of the third image below) is relative to the sharp angles pronounced in Phil's image.


John
Phil Stooke
https://www.weibo.com/ttarticle/p/show?id=2...425030623690756

This link is to a rover diary for lunar day 10. Using Chrome to translate, it seems that some technical issues had to be overcome (sun sensor and knowledge of attitude) so not much movement this month - Andrew Jones tweeted that the drive was only about 5 m. Yutu 2 is still near the small crater with a bit of glass in it (and there's a photo of the sparkly glass in the article) and either made a new analysis with better lighting or is going to do that before they leave.

Phil
Phil Stooke
https://twitter.com/AJ_FI/status/1183671036958642176

Here Andrew Jones tweets some more images from Yutu 2 including nice views of the central peak and the tracks behind the rover. I have projected those images (very roughly) to help with mapping.

Phil

Click to view attachment
Phil Stooke
That was a very crude reprojection of the tracks image for initial planning work. Here is a better version.

Phil

Click to view attachment

Click to view attachment
atomoid
latest on the starch wreck gummies.. new article on space.com has some processed images
John Moore
Latest by LRO - finding the probable impact site of Longjiang-2.

John Moore
Phil Stooke
A very nice bit of work there by Cees Bassa, Daniel Estevez and others. This comparison of the before and after images shows the difference between the two frames, with increased contrast. The images were just taken from the release, obviously.

At first I thought the ejecta was deflected off the approach vector by the steep slope, but the difference image makes me feel it is more symmetrical.

Phil


Click to view attachment
John Moore
It truly is extraordinary from the LRO perspective -- given the very minute change in the terrain texture surface (barely noticeable by none of us, really).

John More
Phil Stooke
There is a new drive diary for CE4's day 11 here:

https://mp.weixin.qq.com/s/XpmEyGIC9GmLWvB40L_CkA

(in Chinese). It includes links to past reports, which is really useful.

Here are versions of the images posted, processed to help make sense of the surroundings and tracks. Orientations are only approximate.

Thanks to Andrew Jones for drawing attention to this via a tweet. He also reports that Yutu 2 is just starting its 12th lunar day.

Phil

Before a tricky drive; after that drive, partial panorama late in the day (note faint tracks if you zoom in).

Click to view attachment Click to view attachment Click to view attachment
zengxingguo
Great work Phil!
I am a Cartographer and a GISer working for NAOC, China. Our team are doing the data
preprocess and release for CE4 science data, according to the the data release policy of China
Lunar Exploration Program(CLEP), the CE4 science data will
be released in a year after the data are acquried, since CE4 started to get lunar image in Jan 3rd,2019;
so the first batch of CE4 science data will be released around Jan 3rd,2020.(http://moon.bao.ac.cn)
Hope it would be useful for you.

PS. We have planned to build a China Lunar and Planetary Data Node in 2020, Using PDS Standard,
then international cooperation are neccessary, and any suggestion or
questiones are warmly welcomed.

zengxingguo
zengxg@nao.cas.cn

QUOTE (Phil Stooke @ Nov 21 2019, 03:09 AM) *
There is a new drive diary for CE4's day 11 here:

https://mp.weixin.qq.com/s/XpmEyGIC9GmLWvB40L_CkA

(in Chinese). It includes links to past reports, which is really useful.

Here are versions of the images posted, processed to help make sense of the surroundings and tracks. Orientations are only approximate.

Thanks to Andrew Jones for drawing attention to this via a tweet. He also reports that Yutu 2 is just starting its 12th lunar day.

Phil

Before a tricky drive; after that drive, partial panorama late in the day (note faint tracks if you zoom in).

Click to view attachment Click to view attachment Click to view attachment

Phil Stooke
Thanks for your very useful information. I had seen your tweet about the new data node, and it will be very exciting for all of us to see the released data. I will be especially interested in seeing assembled panoramas, on the multimedia site at http://moon.bao.ac.cn or in the archive. It has been very interesting to follow the mission even though our information is limited.

Phil

Hungry4info
A lot of new, high-resolution Chang'e 4 images have now appeared on that website.
http://moon.bao.ac.cn/mul/index/list
Phil Stooke
Yes! Something I had been waiting for. Click a thumbnail, and then click the larger version to get the full size. Here is a panorama made by the lander late in Day 1, in a circular projection to show a more map-like view of the landing site.

Phil

Click to view attachment
Hungry4info
The Netherlands-China Low Frequency Explorer (NCLE) experiment has (partially) deployed its antennas. According to the commentary on this page, Queqiao will function as a radio astronomy observatory during the lunar farside night.

However, they have had some difficulty deploying the antennas to full length.
QUOTE
The longer stay behind the moon most probably did have an effect on the antennas. At first, the antennas unfolded smoothly, but as the process progressed, it became increasingly difficult. The team therefore decided to collect data first and perhaps unfold the antennas further at a later point in time. With these shorter antennas, the instrument is sensitive to signals from around 800 million years after the Big Bang. Once unfolded to their full length, they will be able to capture signals from just after the Big Bang.


Hungry4info
QUOTE (Phil Stooke @ Nov 5 2019, 04:29 PM) *
...and to reflect my hope that the prominent crater SW of the current position will be investigated.


The latest released imagery (here) appears to show this crater, though I'm not skilled enough to determine where this image was taken or if it represents a move toward that crater, however the text on the site appears to suggest that's the case. Translated with Google,

QUOTE
After confirming the terrain, we took two steps to the south to reach the dormant point, where we performed color panoramic imaging of the target crater. From the panoramic image taken by the ring, the impact crater is deep and mysterious, and beside it, scattered stones of unknown origin. When you stare at the abyss, the abyss is also staring at you, maybe you can solve the mystery by just going further ...


Phil Stooke
I think it is that crater. Here is my interpretation of the new imaging, two views approximately identified, with a trace of the tracks from one of them. I used that to update the map.

Phil

Click to view attachment
Hungry4info
There has been a massive data release to the Chinese PDS at http://moon.bao.ac.cn, apparently comprising 38 Gb of data. I haven't quite figured out how to get to it myself, but there are some pointers in this twitter thread.
djellison
WOAH....this is the first thing I could download and generate....just the first 6 images from the rover panoramic camera data.

Heads up - download the label AND the product.... and then open the label using the PDS4 viewer here : http://sbndev.astro.umd.edu/wiki/PDS4_Viewer

Straight up stitch, and debayered stitch attached.

(I'm dumping stuff here as I process it : https://dougellison.smugmug.com/Change-4-Yutu-2/i-SsB4MDr )
Phil Stooke
Fantastic stuff, Doug. As is my wont, I had to make a circular projection of the 23 November panorama (after a bit of cosmetic work) (on the picture, not on me personally).

Phil

Click to view attachment

The crater with the glass in it is near the outer edge at 4 o'clock. I have roughly oriented it with north near the top.
djellison
So this mosaic from July 29th 2019 is maybe the glass?

https://dougellison.smugmug.com/Change-4-Yutu-2/i-Dsn3GTd/A

I can see why it got their attention, but oh boy was that a case of lost in translation.

Click to view attachment
djellison
Did a lot of processing last night - and tweeted out a thread on how to process the images as well

https://threadreaderapp.com/thread/12133264...shed=1578189033

This 6 frame mosaic from site 48 is probably my favorite.
https://dougellison.smugmug.com/Change-4-Yutu-2/i-hgFGNnh/A
Phil Stooke
Doug has been tweeting site numbers, which are in the filenames along with the date. Here is a map with the site numbers I have seen so far. Please let me know if any more can be added, or if there is a map or table in the data release with this information.

Phil

Click to view attachment
Phil Stooke
Another of Doug's panoramas reprojected. This is the one from 28 February with severe sun glare in the east - taken soon after sunrise and showing the cluster of rocks which were the subject of the first VNIS analysis of a rock rather than regolith. I cleaned up some of the contrast variations.

Phil

Click to view attachment
Phil Stooke
Doug posted another panorama, this time from Feb. 11th at site 10. It is exactly the same location as the image above, from the Feb. 28th panorama at site 11, but with evening lighting instead of morning.

Phil

Click to view attachment
Phil Stooke
... and Doug's new panorama from site 5, 31 January. This was very bland in the original so I have pulled out detail in the down-sun direction.

Phil

Click to view attachment

Also - this is the updated site numbers map. Maybe they should be called panorama numbers, if end of day and start of the next day panoramas at the same site have different numbers.

Click to view attachment
djellison
Is there a gap in the panorama numbers that would be a helpful panorama, Phil?
Phil Stooke
I would like to see anything around number 40, lunar day 6. The tracks there are complicated, it would be good to see them. But I'm happy with anything and everything!

Phil
Phil Stooke
My hero!

Phil
Phil Stooke
OK, to get started... this is a circular version (with considerable contrast enhancement) of the May 30 panorama. It shows how we can learn things from the images. The tracks show that this location is what I show on the map as the 6th lunar night stop. If Yutu 2 was there on May 30, it probably drove on May 27, 28, 29 and 30 and then stopped for its noon break. In the afternoon it did no driving and stayed there until waking for the next day.

EDIT: No... not quite. Now I have done the June 9 panorama, I see that the position on my map labelled June 9th was incorrect. So now I can see that there was a drive in the afternoon, and I can label the locations properly. I will update the map when I have all these things sorted out, but having the panoramas is very useful. Mapping like this is an iterative process.

Phil

Click to view attachment
Phil Stooke
This is the updated map of panorama numbers. The base includes a correction for the end of lunar day 6. A full map update taking all panorama locations and dates into account will follow soon. Trying to map in real time is always going to be iterative!

Phil

Click to view attachment
djellison
Yeah - the area around Pan 50 - the 'gel' crater - they certainly approach it a few times... https://dougellison.smugmug.com/Change-4-Yutu-2/i-H7Zxsqr/A
Phil Stooke
One of Doug's panoramas in circular form.

Phil

July 6:

Click to view attachment
Phil Stooke
This is the June 9th panorama reprojected.

Phil

Click to view attachment
Phil Stooke
And here's a drive diary for the last lunar day. Open in something that will translate it for you.

Phil

https://www.bilibili.com/read/cv4340966
Phil Stooke
This is the Oct. 25th panorama made by Doug and reprojected to show the area in a somewhat map-like form (but still full of topographic distortions) (are there DEMs in the data release?).

Click to view attachment

And an updated panorama number map. Doug says some numbers are missing. They may be other types of observation rather than panoramas.

Click to view attachment

Phil
djellison
I don't see DEMs in the release. I've tried some photogrammetry with the images with very very mixed results

Pan 10
https://sketchfab.com/3d-models/change-4-yu...38c0f4cecab14ab

Pan 18
https://sketchfab.com/3d-models/change-4-yu...a86461b3c3728bd

Pan 22
https://sketchfab.com/3d-models/change-4-yu...578d458f0c84130

Phil Stooke
Hi Doug - can you post the original Pan 18? I don't think it's on Smugmug yet.

Phil

Phil Stooke
Thanks so much. Here's a circular view.

Phil

Click to view attachment
Phil Stooke
Yutu 2 is just about to wake up for lunar day 14. This is a mosaic of two recently released images showing the road ahead towards a prominent crater (top left).

Click to view attachment

And a rough reprojection:

Click to view attachment

Phil
Nordren
Lunar day 14 is underway. Yutu-2 rover awoke at 14:00 UTC January 18 and the lander following at 09:55 Sunday, according to a social media post from CLEP. Two images released.

Click to view attachment
Click to view attachment
djellison
So - I went thru every pan number there is for the rover, opened the label file for the first image listed and pulled out the start time, lat and long, and the X, Y, Z from the lander.

While other data sets do have some points at Pan numbers not listed below....they do not have the Lander frame X,Y,Z data
Zipped up XLSX attached, as well as a crude X vs Y scatter plot.


Pan Start Time Rover Longitude Rover Latitude Lander X Lander Y Lander Z
1 2019-01-04T04:15:18.011Z 177.599017 -45.44502 -1.759764 -12.692296 -0.834688
2 2019-01-10T21:11:29.451Z 177.598821 -45.444298 -5.91543 9.126358 -0.088721
3 2019-01-12T10:08:36.801Z 177.598632 -45.444101 -9.922689 15.07963 -0.429371
5 2019-01-31T17:25:22.255Z 177.598225 -45.443865 -18.552117 22.211425 -0.146258
6 2019-02-01T14:23:58.141Z 177.597694 -45.443521 -29.810781 32.606861 -0.249397
7 2019-02-08T20:45:47.117Z 177.59707 -45.443625 -43.041079 29.463715 -0.726265
9 2019-02-09T14:48:29.173Z 177.596713 -45.444048 -50.610007 16.680557 -0.230944
10 2019-02-11T02:59:33.023Z 177.596055 -45.443988 -64.561216 18.49327 -0.386951
11 2019-02-28T08:15:19.262Z 177.596055 -45.443988 -64.561216 18.49327 -0.386956
18 2019-03-03T07:24:14.968Z 177.595598 -45.444084 -74.250569 15.591778 -0.483145
19 2019-03-10T02:17:34.646Z 177.595597 -45.444073 -74.27177 15.924191 -0.830961
20 2019-03-10T15:11:37.602Z 177.595189 -45.444017 -82.922409 17.616099 -0.72672
21 2019-03-11T19:21:06.350Z 177.594663 -45.443716 -94.075368 26.711671 -0.401053
22 2019-03-12T07:54:14.510Z 177.594439 -45.443621 -98.824882 29.582277 -0.504348
30 2019-04-01T07:21:17.218Z 177.594177 -45.443472 -104.380201 34.084686 -0.722461
32 2019-04-11T02:06:15.518Z 177.593814 -45.443491 -112.076686 33.51002 -0.819108
33 2019-04-29T14:37:38.249Z 177.593636 -45.443368 -115.85098 37.226793 -1.013572
34 2019-05-01T03:04:12.505Z 177.593599 -45.443429 -116.63537 35.383341 -0.715814
35 2019-05-08T02:32:58.229Z 177.593603 -45.443427 -116.55055 35.443782 -0.925472
38 2019-05-10T10:01:15.233Z 177.593479 -45.443385 -119.179746 36.712826 -1.08647
42 2019-05-30T12:42:26.488Z 177.593088 -45.443538 -127.469635 32.088611 -0.784407
43 2019-06-09T02:41:56.276Z 177.592582 -45.443543 -138.198076 31.936669 -1.151678
44 2019-06-28T04:13:46.863Z 177.592056 -45.443531 -149.350636 32.298365 -1.162575
47 2019-07-06T11:30:53.779Z 177.591667 -45.443557 -157.598359 31.511912 -1.044718
48 2019-07-08T04:33:58.347Z 177.591486 -45.443507 -161.436147 33.022538 -1.172553
50 2019-07-29T01:18:59.329Z 177.590606 -45.443137 -180.095548 44.20197 -1.333302
53 2019-08-06T11:34:52.535Z 177.59065 -45.443311 -179.162096 38.943837 -1.152623
60 2019-08-27T09:42:41.591Z 177.590575 -45.443274 -180.75239 40.061796 -1.34759
67 2019-09-05T07:18:18.365Z 177.590437 -45.44312 -183.678869 44.715327 -1.204995
76 2019-09-25T03:18:38.935Z 177.590256 -45.443022 -187.516844 47.676434 -1.551671
92 2019-10-25T05:31:54.960Z 177.589671 -45.442755 -199.921397 55.7437 -1.410534
94 2019-11-03T01:21:53.512Z 177.589142 -45.442875 -211.137216 52.115973 -1.607826
95 2019-11-23T09:18:29.232Z 177.588667 -45.442573 -221.209778 61.241073 -1.127004
97 2019-12-02T05:21:08.786Z 177.588335 -45.442877 -228.247941 52.05335 -0.883405


I've also added a few more panoramas to the gallery including this one of Pan 0060 - probably the best of the 'gel' crater - https://dougellison.smugmug.com/Change-4-Yutu-2/i-ptMhv5d/A

Agisoft was able to extract a good model - https://sketchfab.com/3d-models/change-4-yu...f5679e069263852
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