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Hayabusa2 MINERVA-II-1 operation, 20-21 September 2018
pandaneko
post Sep 22 2018, 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 Sep 22 2018, 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 Sep 22 2018, 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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Guest_mcmcmc_*
post Sep 22 2018, 08:32 AM
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Guests






I found these two twiter accounts which commented in realtime the press conference:
https://twitter.com/moffmiyazaki
https://twitter.com/ShinyaMatsuura

And we can try looking for "はやぶさ 2" in Google.


While we wait, here they are an animation of MINERVA-II separation and an estimation of landing site location:
https://www.youtube.com/watch?v=4FrRC6e8ZMo


A 18cm-wide object would result 2-pixel wide in an ONC-W1 taken from 80m away and 1-pizle wide in ONC-T from 20 km away, so no chance of seeing rovers from "orbit", but maybe some chances to see them in post-deployement ONC-W1 images.

http://win98.altervista.org/telescopio.html (0.00018 km = 18cm)
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pandaneko
post Sep 22 2018, 08:59 AM
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QUOTE (nprev @ Sep 22 2018, 03:42 PM) *
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.


Not at all. I am upset about it, actually. There were many reporters at the press conference from many different media groups, but they
do not seem to write about rovers. My guess is that their bosses ignore them and send their draft articles straight into dustbin.
MASCOT may get more publicity when it lands on Ryugu because it is not Japanese by origin.

P
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Paolo
post Sep 22 2018, 12:22 PM
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pics from MINERVA!
http://www.hayabusa2.jaxa.jp/topics/20180922/

status (from Japanese twitter): both rovers made it to the surface
https://twitter.com/haya2_jaxa/status/1043473771099615232
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pandaneko
post Sep 22 2018, 01:07 PM
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Translation of the latest input from JAXA. Please refer to the main page of JAXA in Japanese as there is no Engolish version yet available
with corresponding photos.

2 rovers were seperated from H2 on 21 Sept. (13:06 JST)

It has been confirmed that both safely landed on Ryugu and are both healthy. They took photos and obtained other data and
that they are even hopping on Ryugu surface has been confirmed.

What follows are the photos from these rovers.

Figure 1:

13:08 on 21 September 2018 by rover 1A, in colour, immediately after seperation while it is spinning. In the photo an object
above is H2 and object bellow is Ryugu surface. Blurring is due to the spin.


Figure 2:

13:07 JST on 21 September 2018 by rover 1B, in colour, immediately after seperation. Righhand below is Ryugu.


Figure 3:

11:44 on 22 September 2018 by rover 1A, in colour.

This photo was taken while it was hopping. Righthand half is Ryugu.


MINERVA-Ⅱ operati0n will continue and there will be more photos.

P














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Explorer1
post Sep 22 2018, 01:27 PM
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Now that's worth the wait.... that's one of the coolest shots I've ever seen; low quality but astonishing (reminds me of the Huygens surface pics!)
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Blue Sky
post Sep 22 2018, 01:43 PM
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Hopefull there will be some pictures taken when the rover is not in mid-bounce! And some scale information would be helpful, like, is that rock the size of a house or the size of a footstool?
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yoichi
post Sep 22 2018, 01:56 PM
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fig1
https://twitter.com/haya2e_jaxa/status/1043482666958352385
HAYABUSA2@JAXA‏ @haya2e_jaxa
This is a picture from MINERVA-II1. The color photo was captured by Rover-1A on September 21 around 13:08 JST, immediately after separation from the spacecraft. Hayabusa2 is top and Ryugu's surface is below. The image is blurred because the rover is spinning. #asteroidlanding

fig2
https://twitter.com/haya2e_jaxa/status/1043484079469953025
HAYABUSA2@JAXA‏ @haya2e_jaxa
Photo taken by Rover-1B on Sept 21 at ~13:07 JST. It was captured just after separation from the spacecraft. Ryugu's surface is in the lower right. The misty top left region is due to the reflection of sunlight. 1B seems to rotate slowly after separation, minimising image blur.

fig3
https://twitter.com/haya2e_jaxa/status/1043486871504867329
HAYABUSA2@JAXA‏ @haya2e_jaxa
This dynamic photo was captured by Rover-1A on September 22 at around 11:44 JST. It was taken on Ryugu's surface during a hop. The left-half is the surface of Ryugu, while the white region on the right is due to sunlight. (Hayabusa2 Project)
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abalone
post Sep 22 2018, 02:08 PM
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http://www.hayabusa2.jaxa.jp/topics/20180922/
Surface images
https://pbs.twimg.com/card_img/104347041706...mp;name=600x314
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yoichi
post Sep 22 2018, 02:14 PM
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press release in english
http://www.hayabusa2.jaxa.jp/en/topics/20180922e/
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dvandorn
post Sep 22 2018, 03:30 PM
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Outstanding!

I have one thing about which I am curious. The final of the three images states it was taken while its rover was in mid-hop. I'm wondering why any hopping activity was occurring without any commands sent from Earth -- I didn't see any indication of pre-programmed hopping set up in the deployment and landing timelines that JAXA posted. And from the other statements made, both pre- and post-landing, I can't see any indication that hopping actions were commanded during this time.

I *did* see something that indicated that the rovers were expected to "bounce" and take a good 15 minutes to settle down onto the surface in a stable, non-moving attitude.

Could the caption which indicates the rover was hopping really indicate that it was in a bounce and not in a deliberate or commanded hop?

The difference would be like stating that, say, Opportunity was "roving" as it bounced to a stop within Eagle Crater...


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Explorer1
post Sep 22 2018, 03:58 PM
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The blurriness rather reminds me of the first image from Philae, though it was quite clear by that point the landing systems had not worked!
Perhaps one or both just hit a boulder at a certain angle and bounced a bit more?
I wonder if the mothership took any pictures after deployment, like Rosetta?
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Phil Stooke
post Sep 22 2018, 04:26 PM
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Great pictures! I was reminded of the images from Sojourner, especially the little colour camera. Ted Stryk did some great processing of those.

Let's hope for lots more.

Phil


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