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Mission: Hayabusa 2
Marcin600
post Feb 8 2021, 12:37 AM
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A new pdf from the press conference (February 4, 2021) has appeared on the Hayabusa2 website:
http://www.hayabusa2.jaxa.jp/en/enjoy/mate...04_ver5_en2.pdf


It contains the current status of the mission: sample testing (very briefly), the progress of an extended mission and several research results from the probe, including an article that appeared in Nature Astronomy: „Thermally altered subsurface material of asteroid (162173) Ryugu”: https://www.nature.com/articles/s41550-020-01271-2
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Explorer1
post Feb 13 2021, 03:41 PM
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While we wait for scientific results, a very nice video about public outreach:
https://www.youtube.com/watch?v=NLuf64TK6DA
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Marcin600
post Feb 20 2021, 11:27 PM
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For those interested in the ongoing research of the Ryugu samples, some useful (I think) link(s):

https://curation.isas.jaxa.jp/en/ - ASRG (Astromaterials Science Research Group) homepage - sample testing is underway here (I hope there will be some current news)

https://curation.isas.jaxa.jp/en/sample-curation/ryugu/ - detailed description of current and future sample testing process

https://curation.isas.jaxa.jp/en/sample-cur.../collaboration/ - international cooperation


Photo 1 and info from January 29, 2021: „...The picture shows the work that the samples in the clean chamber are being handled with a vacuum tweezer and stored into the designated container.” (https://curation.isas.jaxa.jp/en/topics/21-01-29.html)

Photo 2: Loop needle used to carry samples

Photo 3: A known picture of chamber A with samples, but in high resolution (https://s3-ap-northeast-1.amazonaws.com/jaxa-jda/http_root/photo/P100013138/a355b28bcd771d5bb3a57e68c3a6b8c3.jpg)

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Marcin600
post Feb 20 2021, 11:50 PM
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And a link to the JAXA Repository - https://jaxa.repo.nii.ac.jp/?action=pages_v...mp;lang=english
For example, there is now a complete catalog of Itokawa micro-samples (ver. 2020, 342 MB) - https://jaxa.repo.nii.ac.jp/index.php?actio...amp;block_id=21

Here is a short video of flying over the return capsule after it has landed - http://jda.jaxa.jp/result.php?lang=e&i...660b405af567b2a
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Marcin600
post Feb 23 2021, 08:16 PM
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Citations from two LPSC 52 abstracts:

S. Tachibana et al. HAYABUSA2 REENTRY CAPSULE RETRIEVAL AND SAMPLE CONTAINER OPENING OPERATIONS.
https://www.hou.usra.edu/meetings/lpsc2021/pdf/1289.pdf
[in Australia:]
."..The temperature monitor attached to the sample container indicated that the container was never heated up to 65°C, which is lower than the maximum daytime temperature at the Ryugu surface...
...The container was in vaccum, indicating the container seal held during reentry and therefore low terrestrial contamination. The gas extracted from the sample container was split into four gas tanks at room temperature, and the residual gas in the system was then trapped into two gas tanks cooled at liquid nitrogen temperature. A fraction of the gas was analyzed by a quadrupole mass spectrometer (WATMASS, Tokyo Electronics). The obtained mass spectrum was distinctly different from the terrestrial air, and the detailed analysis is still being performed for the gas stored in the tanks..."

[in Japan:]
"...Particles in the Sample Container: Initial description of the samples inside the sample container by the ISAS/JAXA curation found that the samples have the following characteristics:
(1) Particles were found in two separate chambers used for two landing operations at Ryugu, indicating that the samples at the different surface locations were obtained successfully.
(2) The particles were black in color, consistent with the color of Ryugu boulders.
(3) Millimeter- to centimeter-sized pebbles are present. Centimeter-sized grains, close to the maximum obtainable size, are found in the sample obtained during the second landing operation nearby the artificial crater.
(4) The total weight of the sample exceeds 5 g, which is far more than the mission requirement (0.1 g)..."


T. Yada et al. HANDLING AND DESCRIPTION OF C-TYPE ASTEROID RYUGU SAMPLES RETURNED BY HAYABUSA2.
https://www.hou.usra.edu/meetings/lpsc2021/pdf/2008.pdf
"...Particles smaller than 1 mm were also observed in chamber B as well...
...Future plan for sample distributions: The initial description of the Ryugu samples will last for 6 months after the return of the samples. The samples will be distributed to the initial analysis team of Hayabusa2 the phase2 curation teams that will make detailed analysis with a collaboration with ESCuC. One year later after the return, 10% of the samples will be delivered to NASA based on the Memorandum of Understanding between JAXA and NASA. Simultaneously, some fraction of samples will be distributed to overseas phase2 curation teams. JAXA will release the announcement of opportunity for the Hayabusa2 samples to the community with the sample catalog after 18 months from the return..."
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Paolo
post Mar 5 2021, 06:50 AM
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An open access paper in Astronomy & Astrophysics:
Size of particles ejected from an artificial impact crater on asteroid 162173 Ryugu
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Marcin600
post Mar 7 2021, 01:04 AM
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PDF with Hayabusa2 news from March 5, 2021 (only in Japanese so far) - https://www.hayabusa2.jaxa.jp/enjoy/materia...210305_ver5.pdf
Includes: sample analysis status, rear heat shield inspection, mission status...

Pictures: rear heat shield and 3 Ryugu samples from chamber C (containers diameter: 21 mm)
Credit: JAXA

Edit: now in English - https://www.hayabusa2.jaxa.jp/en/enjoy/mate...05_ver5_en2.pdf

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Marcin600
post Mar 21 2021, 01:18 PM
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Planetary radio: a very interesting and informative conversation between Mat Kaplan and the Hayabusa2 Project Manager Yuichi Tsuda (about Hayabusa2 mission, sample testing, extended mission and the future MMX mission to Phobos) - https://www.planetary.org/planetary-radio/y...tsuda-hayabusa2

A few quotes from the interview:
- the artificial crater has a diameter of 18 m
- the curtain of debris reached a height of approx. 40 m
- the total of the samples weighs 5.4g
- chamber A contained samples from the 1st touchdown and C - from the second touchdown
- chamber B was opened between touchdown 1 and 2 - it turned out to contain very fine grains
- currently, a catalog of individual samples is being created (sizes from less than 1 mm to 1 cm)
- an analysis of the composition of this material will begin in early summer (including carbon and water content, organic compounds and hydrated minerals)
- more than 50% of the fuel remained on board the Hayabusa2
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Marcin600
post Apr 3 2021, 12:21 PM
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On JAXA Sagamihara Channel - https://www.youtube.com/channel/UCj5JPsqumx...1Dg?app=desktop :
„JAXA Sagamihara Campus Online Special Opening” (Day 2, March 27, 2021) - Visit with a camera in ESCuC - Extraterrestial Sample Curation Center -
https://www.youtube.com/watch?v=5E2XZG0ZjTg - from 4:08:45 to 4:23:40

For example, at 4:16:47 you can see the samples of Ryugu being picked up from chamber A with the "micro-catcher":
Credit: JAXA
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Marcin600
post Apr 3 2021, 01:07 PM
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a slightly larger animated gif
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Marcin600
post Apr 3 2021, 01:24 PM
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and one more
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