Mission: Hayabusa 2 Options

[Marcin600]

By the way, I'm wondering about the copyright (?) for these photos and video. On the slides during this presentation there was a rather unusual (at least for me) icon:

After all, since the presentation was - officially and legally - on youtube, then everyone can take a "photo" (printscreen). And I'm not talking about reproduction and distribution, because that's another matter. But a ban on taking a picture for yourself? After placing the presentation on youtube, this icon is no longer valid, isn't ?

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[Explorer1]

I am not an intellectual property lawyer, but I hazard a guess that fair use applies here, like when users on this forum modify/reproduce non-NASA images. Just don't sell the image (or put the image on a product you are selling)! And give credit to JAXA too, of course!

[Marcin600]

Pdf from latest press conference - December 19, 2019 (in Japanese)

[Marcin600]

Some videos and screenshots from the famous presentation of Professor Masahiko Arakawa (Kobe University) during the AGU (American Geophysical Union) AGU100 Fall Meeteng, San Francisco, CA, 9-13 December 2019

Arakawa et al. "Artificial impact crater formed by Hayabusa2 small carry-on impactor on the surface of asteroid Ryugu" - abstract with a full list of co-authors

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[Marcin600]

continued...

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[Marcin600]

Pdf from new press conference (February 20, 2020) - for now only in Japanese.
I am posting a rough translation (from Google Translate) of the most important informations:

Asteroid explorer Hayabusa2 Press briefing, JAXA Hayabusa2 Project
February 20, 2020

Current status: The operation of the ion engine, which started on December 3, 2019, was temporarily stopped on February 5, 2020. A precise orbit estimation was performed afterwards. Based on the results, a minor modification of the ion engine injection was carried out on February 18-20, and the engine was stopped today, February 20 at 8:01 (JST). The first-stage ion engine operation in the return phase was completed.

The speed increase on the return trip is about 100 m/s. Xenon remaining is less than 60%.
As of February 20, 2020: Consumes 27 kg of Xenon propellant and 39 kg remain.

Operation check of all combinations of ion engines A, C, D: from November 20, 2019
Performance check of ion engine B for backup: 2020.2.3-4
Results: Everything is fine. The Earth return operation will be performed with all four ion engines available.

Future plans:
- May 2020 - Phase 2 ion engine operation (planned)
- Press briefing - April 2020

[Marcin600]

Interesting picture of an model of artificial crater on Ryugu (from Hayabusa2 Talk Live Season 2, February 15, 2020, Taketake Town Hall (Yumetaro Plaza)
It reflects the scale of the SCI crater quite well. (or maybe the model is a bit exaggerated ???)

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[Marcin600]

I haven't seen this montage of MINERVA-II2 pictures yet (from here - eng. and here - jap.)

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[Marcin600]

Recent Hayabusa2 reporter briefing (February 20, 2020; amended March 11) pdf is already in English
Current operation status, ion engine operation results and more...

[Quetzalcoatl]

Hello !

I thank Marcin600 for his exemplary follow-up of this topic.

Report of an article published in Nature, on the official website of Hayabusa2 and which I found very interesting.

Highly porous nature of a primitive asteroid revealed by thermal imaging. Authors：Okada, T., Fukuhara, T., Tanaka, S. et al.

http://www.hayabusa2.jaxa.jp/en/topics/20200318_nature/

[Paolo]

a paper on the cratering experiment has just been published in Science (and it is not behind the paywall at the moment):

An artificial impact on the asteroid 162173 Ryugu formed a crater in the gravity-dominated regime

The Hayabusa2 spacecraft investigated the small asteroid Ryugu, which has a rubble pile structure. We describe an impact experiment on Ryugu using Hayabusa2’s Small Carry-on Impactor (SCI). The impact produced an artificial crater with a diameter >10 m, which has a semicircular shape, an elevated rim and a central pit. Images of the impact and resulting ejecta were recorded by the Deployable CAMera 3 (DCAM3) for >8 min, showing the growth of an ejecta curtain (the outer edge of the ejecta) and deposition of ejecta onto the surface. The ejecta curtain was asymmetric, heterogeneous, and never fully detached from the surface. The crater formed in the gravity-dominated regime i.e., crater growth was limited by gravity, not surface strength. We discuss implications for Ryugu’s surface age.

[Marcin600]

"I thank Marcin600 for his exemplary follow-up of this topic..."

Thank you Quetzalcoatl! I am just trying to fill the gap in the information stream that reaches us (with some delay and quite dispersed) from the official pages of the Hayabusa2 mission. But only when other, more experienced and talented members of this forum do not have time for this.


"a paper on the cratering experiment has just been published in Science (and it is not behind the paywall at the moment):
An artificial impact on the asteroid 162173 Ryugu formed a crater in the gravity-dominated regime"

Thanks Paolo, we finally have it officially!

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[Marcin600]

from the article cited above by Quetzalcoatl:

„...The first global thermal image... and high resolution images taken close to the surface... showed little temperature difference between the majority of boulders and the surrounding material on the surface of Ryugu, pointing to a similar thermal inertia value... The implication is that Ryugu is covered with low-density, porous boulders that are surrounded by similarly porous fragments greater than 10 cm in size... The reverberations have important implications for how planets are formed.”

Pdf - here

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[Quetzalcoatl]

Bonjour à tous,

Thanks to the creation of an artificial crater during the Hayabusa2 mission, Japanese scientists were able to determine certain phases of Itokawa’s history. The process and parameters of this operation and the study of the overall cratering of this asteroid have indeed allowed to draw a number of conclusions regarding the history of this pile of rocks.

http://www.hayabusa2.jaxa.jp/en/topics/20200320_science/

And the Science paper : https://science.sciencemag.org/content/earl...science.aaz1701

[Marcin600]

Newly released by JAXA:

- compiled animation from the first touchdown, including ONC-W1 pictures (from 0:26)

- composite image taken with the ONC-W1 and W2 during the 1st touchdown

- new paper published in Science - about the surface of Ryugu, with excellent pictures showing stones picked up by the blast of Hayabus2 engines (free, pdf here)
[ look at Supplementary Materials with video and pictures ]

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