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Mission: Hayabusa 2
Hungry4info
post Yesterday, 05:00 AM
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MINERVA-II1 has separated!


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dvandorn
post Yesterday, 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.

Attached Image


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Hungry4info
post Yesterday, 05:37 AM
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Contexts of the latest two images as of the time of this post.

Attached thumbnail(s)
Attached Image
Attached Image
 


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mcmcmc
post Yesterday, 12:10 PM
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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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mcmcmc
post Yesterday, 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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mcmcmc
post Yesterday, 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 Yesterday, 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 Today, 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 Today, 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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dvandorn
post Today, 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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Hungry4info
post Today, 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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pandaneko
post Today, 06:14 AM
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What follows is bits and pieces of information from this one hour long press conference yesterday in Japanese.

1. Minerva 21A and 21B were normally seperated at 13:06 JST at the height of 55m. H2 waited for 60 seconds so that thruster fires will
not aftect the seperated rovers and H2 in now heading back to HP.

2. If all went well rovers should have reached Ryugu surface after 15 minutes from the moment of seperatioon. In terms of
communication with the rovers it stopped after about 1.5 hours from the moment of seperation and the reason is thought that rovers are
now experiencing the night time.

3. Ryugu morning is expected to be at around 19:00 JST today, but since rovers are solar powered not enough battery charging may be
possible if they happen to be in the shadows of large boulders.

4. When H2: Earth communications started after seperation Minerva: H2 communication also at the same time started. This has been
confirmed.

5. Rovers are thought to have landed somewhere within N6, which is about 150m north of the equater. MASCOT will land 200m
south of the eqater.

6. At least one picture was taken and this has been confirmed. However, data will be linked back to earth from earlier data, i.e., 20km
point down, so surface picture aquisition will be delayed, perhaps by a few days from now.

7. It is possible that rovers actually landed and are sleeping now as the only source of power is the sunlight.

8. N6 was chosen mainly because its temp. is thought to be less than other areas.

P
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pandaneko
post Today, 06:26 AM
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I forgot to add from my press conference notes that:

1. Rovers have very primitive photodiodes so that they can tell H2 if they are dead or alive. Also, gyro sensors will be able to tell the
story about their descent to Ryugu. Also, temp. sensors built into the spikes. All these will be able to say something about the fate
of these rovers, soon.

2. H2 has, in addition to LIDAR, a proximity altitude sensor. Its range overlaps slightly with LIDAR range.

P
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nprev
post Today, 06:42 AM
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Thanks, Pandaneko. Is the mission being well-covered by the Japanese media? Wondering if you and other people in Japan will get updates faster than the rest of us.


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