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Hayabusa2 MINERVA-II-1 operation, 20-21 September 2018
charborob
post Sep 20 2018, 11:13 AM
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Hayabusa 2 has started its descent towards Ryugu for Minerva deployment. Real time navigation images are posted here. One new image every half hour or so.
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Guest_mcmcmc_*
post Sep 20 2018, 12:35 PM
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Operations schedule in GMT:

05:10 - Start descent from 20 km Done 05:08, Confirmed 05:26
11:00 - 13 km from Center Of Gravity of Ryugu CdG
15:30 - 5 km from CoG, deceleration from 0.40 to 0.10 m/s (from 1.44 km/h to 0.36 km/h)
18:30 - 4 km from CoG

21 september
00:00 - 2 km from CoG
00:10 - Altitude 1500 meters above surface
03:00 - Altitude 500 meters above surface
03:40 - Altitude 250 meters above surface
04:00-04:30 - Altitude 60 meters - Rover deployment, H2 raises again

Rovers diameter: 18 cm; 60 m away they will be 30 pixel wide in ONC-T, 3 pixel in ONC-W1.

http://www.hayabusa2.jaxa.jp/en/topics/20180920e/
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Hungry4info
post Sep 21 2018, 02:43 AM
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After about 2 hours of no new images, the real-time image page is updating again. We can definitely see the spacecraft's shadow now. This image received at 2018 Sep 21 02:10 UTC.
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Hungry4info
post Sep 21 2018, 04:21 AM
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Cruising over the surface of Ryugu. 2018 Sep 21, 04:09 UTC. MINERVA-II1 deploy should be any minute now, if it hasn't already happened.
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Hungry4info
post Sep 21 2018, 05:00 AM
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MINERVA-II1 has separated!


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-- Hungry4info (Sirius_Alpha)
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dvandorn
post Sep 21 2018, 05:17 AM
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Here is the image posted, taken from the JAXA web page, at 4:19 UTC. Likely taken as much as 30 to 40 minutes prior to Minerva release.

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“The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Hungry4info
post Sep 21 2018, 05:37 AM
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Contexts of the latest two images as of the time of this post.

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Guest_mcmcmc_*
post Sep 21 2018, 12:10 PM
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Guests






Gyroscope issues detected, but not relevant because rovers can communicate in any orientation.
Sunrise should be around 10:00 UTC, but when sun will actually hit panels depends on terrain.
Telemetries reveal at least one picture has been taken but not yet transmitted.
Data rate is 32 kbps.


Twitter feeds with comments about the just finished press conference:
https://twitter.com/ShinyaMatsuura
https://twitter.com/moffmiyazaki

Press release in Japanese:
http://fanfun.jaxa.jp/jaxatv/files/20180921_minerva2.pdf

Today press conference:
https://www.youtube.com/watch?v=MrwMFbzl-Fs
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Guest_mcmcmc_*
post Sep 21 2018, 12:38 PM
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Sunrise over rovers should have happened since a couple of hours now, but who knows where they are w.r.t H2?
Deployment happened at 04:35 UTC, which means 16 minutes after this image was taken:
http://www.hayabusa2.jaxa.jp/en/galleries/...01809210419.jpg

UTC 04:17: H2 is 100 meters away from surface.
UTC 04:35 Rover deployment , H2 is 55 meters away.

So we can assume taht the image was taken (at 04:19) when H2 was around 90 meters from surface. Hence landing site should be not so far from where H2 shadow appears in the image.
Is anybody able to draw that point over one of the 3d models available around?
BTW, is there any hires 3d model available now? First models were very raw.
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Guest_mcmcmc_*
post Sep 21 2018, 01:31 PM
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This image, upside down, show same features of this deployement-phase image.

Page for first image (Image 10 taken on July 20, 2018 at 13:09UTC):
http://www.hayabusa2.jaxa.jp/en/topics/20180905e/










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dvandorn
post Sep 21 2018, 10:26 PM
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So, a nice build-up, a bunch of tweets right up to separation, and then... nothing?

Huh? Am I missing something? Is there a secret forum or thread somewhere in here where the current status of the mission is actually being discussed?


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“The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Hungry4info
post Sep 22 2018, 12:07 AM
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Last I heard they lost contact with them and think it's because they're on the surface of the asteroid on the other side. Though they should have experienced a fully "day" so far now... at least a couple times.


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Phil Stooke
post Sep 22 2018, 01:48 AM
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It seems we have to wait until Saturday for more news. I don't know why.

Phil



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... because the Solar System ain't gonna map itself.
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dvandorn
post Sep 22 2018, 03:25 AM
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I wonder if they missed again. Or hit and bounced completely off.

Ah, well -- I suppose we'll have a better idea tomorrow. At this point, I guess I'm not anticipating good news... sad.gif

-the other Doug


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“The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Hungry4info
post Sep 22 2018, 05:12 AM
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From
https://www.japantimes.co.jp/news/2018/09/2...ryugu-asteroid/

QUOTE
So far so good, but JAXA must wait for the Hayabusa2 probe to send data from the rovers to Earth in a day or two to assess whether the release has been a success, officials said.


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