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Mission: Hayabusa 2
Therion
post Aug 12 2018, 04:05 PM
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QUOTE (pandaneko @ Aug 7 2018, 08:38 AM) *
What bothers me about JAXA's latest findings is the dryness of Ryugu.

JAXA were constantly saying, before arrival, that Ryugu had been chosen because it appears to be a water rich(?)
asteroid. The reason must be remote spectroscopy unless it was just their wishfull thinking and unlss there are
other means of guessing properties of asteroid surface.

So, my guess is that remote spectroscopy across billion km is not at all reliable. Is that right?

P



There was some "suspected transient sublimation activity" as well. Curiously, the signature was observed when Ryugu was at aphelion.

New candidates for active asteroids: main-belt (145) Adeona, (704) Interamnia, (779) Nina, (1474) Beira, and near-Earth (162173) Ryugu
Possible sublimation and dust activity on primitive NEAs: Example of (162173) Ryugu
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vjkane
post Aug 12 2018, 05:09 PM
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pandaneko and Roman Tkachenko - thank you for your work and posts here!


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pandaneko
post Aug 14 2018, 08:40 AM
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What follows is from the witter section of the main Hayabusa 2 web page, two bits in one go.

Status of hayabusa2 (week starting on 6 August 2018)

We conducted a free fall experiment during 5 to 7 August. This was the same operation as landing and meant
it was the second near landing for H2.

Height reached was 851m and we were able to obtain a large number of close up photos. Right now, people are
flowing into ISAS in droves from within Japan and overseas and they are happily discussing new findings.
(13 August 2018)

(we do not seem to be viewing them, not in large numbers...., P)
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Phil Stooke
post Aug 14 2018, 03:43 PM
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"What bothers me about JAXA's latest findings is the dryness of Ryugu.

JAXA were constantly saying, before arrival, that Ryugu had been chosen because it appears to be a water rich(?)
asteroid. The reason must be remote spectroscopy unless it was just their wishfull thinking and unlss there are
other means of guessing properties of asteroid surface.

So, my guess is that remote spectroscopy across billion km is not at all reliable. Is that right?"


I was under the impression that it was chosen for being carbon-rich. Any thoughts about water would be an assumption, not based on direct evidence. Even so, it may contain water below a surface which has been dried by heating. Spectroscopy only tells us about the uppermost surface layer. So I would suggest waiting for later results.

Phil


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... because the Solar System ain't gonna map itself.
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Explorer1
post Aug 14 2018, 06:35 PM
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Article on DLR's plans for the MASCOT landing: https://www.dlr.de/dlr/en/desktopdefault.as...#/gallery/31672
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Roman Tkachenko
post Aug 14 2018, 07:44 PM
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10 possible landing sites for MASCOT lander


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Roman Tkachenko
post Aug 18 2018, 10:16 PM
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10 possible landing sites for MASCOT lander (3D visualization)


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rlorenz
post Yesterday, 03:10 PM
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QUOTE (Phil Stooke @ Aug 14 2018, 11:43 AM) *
So, my guess is that remote spectroscopy across billion km is not at all reliable. Is that right?"


I'm fond of saying 'If you laid all the near-infrared spectroscopists end-to-end, they'd reach across an ocean, but wouldn't reach a conclusion'.

The history of planetary science is full of claims and counterclaims on the interpretation of near-IR spectra, more so than any other type of data, I think, except perhaps geomorphology.
There are of course counterexamples where such spectra have been decisive and important.
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pandaneko
post Today, 02:37 AM
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Thank you, Roman, this rotating movie looks pretty good, and my guess is MA-4 for MASCOT landing. It is a crater rim and may have
something interesting. I really, really want to see photos from MASCOT!!!

P
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