Chang'e 5 sample return mission |
Chang'e 5 sample return mission |
Sep 25 2021, 02:44 AM
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#331
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
-------------------- ... 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 PDF: 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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Oct 1 2021, 09:17 PM
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#332
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
A new paper here:
https://www.researchsquare.com/article/rs-912528/latest.pdf It describes the radar instrument results at CE5. 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 PDF: 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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Oct 8 2021, 08:56 AM
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#333
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
"CHINA'S LUNAR SAMPLES CONFIRM LATE VOLCANISM, POSE NEW QUESTIONS"
https://skyandtelescope.org/astronomy-news/...gbHr0LA.twitter "A team of lunar scientists led by Xiaochao Che (Chinese Academy of Geological Sciences) analyzed the lead content in two basalt fragments of around 3 to 4 millimeters in size, publishing the results in the October 8th Science. They determined the fragments’ to be around 1.96 billion years old, making them almost a billion years younger than material returned by the Apollo and Soviet-era Luna missions as well as what’s found in lunar meteorites." https://www.science.org/doi/10.1126/science.abl7957 -------------------- "The Earth is a very small stage in a vast cosmic arena"
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Nov 21 2021, 05:33 AM
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#334
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Junior Member Group: Members Posts: 38 Joined: 7-October 20 Member No.: 8895 |
Change5 Descent stage latest image from LRO on Jun 23rd , 2021. Shadow of Sampling arm is clearly visible in this image..
https://wms.lroc.asu.edu/lroc/view_lroc/LRO...0/M1379112120RC |
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Nov 27 2021, 05:54 PM
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#335
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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 |
Recently published but unfortunately only available in Chinese:
Overall design of unmanned lunar sampling and return project—Chang’e-5 mission QUOTE The Chang’e-5 mission is the aerospace project with the highest complexity and largest technical span in China. In this paper, the mission objectives and main technical specifications of the mission are introduced, and the project technical scheme is described in terms of the system composition, design constraints, and flight profile. The focus is on seven aspects of technological innovation, such as a novel scheme of return of samples of extraterrestrial objects and two sampling modes—surface sampling and drilling. Eight large-scale tests involving mission matching, coordination, and correctness were analyzed. The tests included the re-entry flight test and a comprehensive test of lunar surface landing and taking-off. The results can provide an important reference for other extraterrestrial sample return missions.
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Nov 27 2021, 06:00 PM
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#336
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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 |
Also note that there are LOTS of Chinese papers on CE-5 design and technology in these journal issues:
https://www.sciengine.com/publisher/scp/jou...1/7?slug=browse https://www.sciengine.com/publisher/scp/jou...1/8?slug=browse |
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Jan 8 2022, 12:53 AM
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#337
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Senior Member Group: Members Posts: 1452 Joined: 26-July 08 Member No.: 4270 |
In-situ detection of water at the Moon with Chang'e 5. 120 ppm in the regolith but a nearby rock had 180 ppm. Lunar interior may have more water.
https://www.science.org/doi/10.1126/sciadv.abl9174 -------------------- -- Hungry4info (Sirius_Alpha)
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Jan 9 2022, 10:00 AM
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#338
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
Interesting.
Is there also some water detection in the samples brought back to Earth? Thorsten |
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Jan 12 2022, 01:51 PM
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#339
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
Is there also some water detection in the samples brought back to Earth? Thorsten I believe this publication on Nature made the analisys: "Water in CE5 apatite and melt inclusions We studied a total of 23 basalt clasts (0.2–1.5 mm in size) from two CE5 soil samples (CE5C0100YJFM00103, about 1 g; CE5C0400YJFM00406, about 2 g; Extended Data Table 1)" "we estimated the water abundance of the bulk CE5 basalts from the modal abundance of apatite and its average water content, because apatite is the dominant water-bearing phase in mare basalts. The modal abundance of apatite in the CE5 basalts is determined to be approximately 0.4 vol%, using the surface areas of apatite in all basaltic clasts analysed (Supplementary Table 1). The average water content and δD value of the CE5 apatite measured by NanoSIMS 50L are 1,921 ± 910 μg g−1 and 578 ± 208‰ (N = 40), respectively" https://www.nature.com/articles/s41586-021-04107-9 -------------------- "The Earth is a very small stage in a vast cosmic arena"
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Jan 12 2022, 02:38 PM
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#340
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
The modal abundance of apatite in the CE5 basalts is determined to be approximately 0.4 vol%... The average water content ... of the CE5 apatite measured by NanoSIMS 50L are 1,921 ± 910 μg g−1..." Correct me if i'm wrong,.. but that means a average of 200 ppm at the apatite part of the samples? -------------------- "The Earth is a very small stage in a vast cosmic arena"
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Jan 13 2022, 02:55 PM
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#341
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
I'm also trying to understand it.
On page 50 they write: "As apatite is the major water-bearing phase in the CE5 basalts, a water abundance of 7 ± 3 μg g−1 for the bulk composition of the CE5 basalts was calculated from the average water content of apatite and its modal abundance of approximately 0.4 vol%" This is much lower than the 120-180ppm from the other paper or what SOFIA measured (200-400ppm or so). What is correct now? Thorsten |
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Jan 13 2022, 05:32 PM
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#342
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
This is much lower than the 120-180ppm from the other paper or what SOFIA measured (200-400ppm or so).What is correct now? Thorsten I Believe that means we have a 192 ppm of water average on the apatite and they are suposing it can be used as parameter to undertand all sample, despite apatite being 0.4 vol% of the sample... either case i don't realy believe it is practical to remove 200 ppm of water from a stone.. it is 0.02%, this would be 200 liters by each cubic meter of stone. -------------------- "The Earth is a very small stage in a vast cosmic arena"
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Jan 13 2022, 05:40 PM
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#343
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
Of course.
I'm asking because I'm working on a system that extracts oxygen from ilmenite with hydrogen and concentrated solar power. The hydrogen in principle is recycled, but there always will be some small losses. But if there are small quantities of water (or other H containing molecules) in the feedstock, than it could be possible to replenish the losses by this source. 200ppm might be enough for that, or at least help. Thorsten |
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Jan 13 2022, 08:10 PM
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#344
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Senior Member Group: Members Posts: 1075 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
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Jan 13 2022, 08:30 PM
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#345
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Member Group: Members Posts: 127 Joined: 3-September 12 From: Almeria, SE Spain Member No.: 6632 |
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