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Mission: Hayabusa 2
Paolo
post Sep 11 2018, 03:42 PM
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it's not the actual sampling operation, yet. it's the first rehearsal:
http://www.hayabusa2.jaxa.jp/en/topics/20180911e/
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Hungry4info
post Sep 12 2018, 02:58 AM
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We're about 1 km away now (if not less). The most recent image as of this post has a major data drop-out, but here's the most recent good image from UTC 2018-09-12 02:32.
Edit: A new image from UTC 2018-09-12 02:51. I'm pretty sure we can now see the spacecraft's shadow on the asteroid -- a dark smudge centered in the opposition surge that appears to be visible in both of the images in this post.

Attached thumbnail(s)
Attached Image
Attached Image
 


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-- Hungry4info (Sirius_Alpha)
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Explorer1
post Sep 12 2018, 03:27 AM
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Good eye! I don't think it was visible in previous images, was it?
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Hungry4info
post Sep 12 2018, 03:52 AM
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Indeed. As far as I can tell, the two images in that post are the only two images where it is clearly visible, and I've not seen it in any previous image.
The site is giving me 404 errors right now, unfortunately. sad.gif

Edit:
From https://twitter.com/haya2e_jaxa/status/1039723761728217089
QUOTE
[TD1-R1] Currently, our real time navigation image gallery has halted. Please wait as we work on the problem. Operation of the spacecraft is continuing normally.


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Therion
post Sep 12 2018, 07:42 AM
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According to update in japanese Hayabusa2 descended to 600 m above sufrace and then autonomous system stopped the descent and began to rise, probably due to unabillity to measure distance by LIDAR because Ryugu's surface have very low reflectivity.

As for the spacecraft's shadow - it's clearly visible in several frames:


/how can i reduce the size of inserted image?
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pandaneko
post Sep 12 2018, 02:03 PM
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The reason for unexpected rise during H2 descent is as follows. My translation of the relevant description in Japanese.

We have been conducting a rehearsal for the first touch down since 10 September. The spacecraft started descending on 11 September.

Today (12 September) H2 was going down to the lowest height intended, but its autonomous system ordered H2 to to rise and
H2 started rising back to its HP.

It is thought that the reason for this is LIDAR could not cope with the low reflectivity of Ryugu and could not measure the seperation
distance well enough.

H2 is now back at its HP ad is healthy. We will be looking again at the constants that had been given to H2 and also looking at
possibility of improved sequence.

P
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Roman Tkachenko
post Sep 12 2018, 02:10 PM
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3D Visualization of Asteroid Ryugu

https://www.youtube.com/watch?v=DDTBBggihiw


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vikingmars
post Sep 13 2018, 06:59 AM
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QUOTE (Roman Tkachenko @ Sep 12 2018, 04:10 PM) *
3D Visualization of Asteroid Ryugu
https://www.youtube.com/watch?v=DDTBBggihiw

CONGRATULATIONS Roman ohmy.gif ohmy.gif ohmy.gif ohmy.gif ohmy.gif ohmy.gif
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Paolo
post Sep 16 2018, 06:05 AM
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The spacecraft shadow and opposition effect
http://www.hayabusa2.jaxa.jp/en/topics/20180915e/
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Hungry4info
post Sep 18 2018, 11:29 PM
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A couple interesting tweets from their twitter feed. One about landing site imagery acquisition during the recent rehearsal attempt, and another about MINERVA-II1 rover deployment schedule.
QUOTE
Although TD1-R1 was interrupted, we were able to see the response of Hayabusa2 at low altitude and gain a valuable image of the landing candidate area at high resolution. The Project Team feels that we are narrowing down the unexplored areas step by step.
QUOTE
This week we will deploy the MINERVA-II1 rovers! Tomorrow (Sept 19) is the preparatory operation prior to the descent and on the 20th, the spacecraft will start descending towards Ryugu. The separation of MINERVA-II1 is scheduled for the 21st.


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-- Hungry4info (Sirius_Alpha)
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mcmcmc
post Yesterday, 07:50 AM
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QUOTE (Roman Tkachenko @ Sep 12 2018, 03:10 PM) *
3D Visualization of Asteroid Ryugu

https://www.youtube.com/watch?v=DDTBBggihiw

Cool.... but very uncomfortable, I feel like being driving (flying?) in reverse! Wouldn't it be better a rotation downwards? Or even better, from right to left, which probably gives a better 3d effect?
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