Hayabusa2 MINERVA-II-1 operation, 20-21 September 2018 |
Hayabusa2 MINERVA-II-1 operation, 20-21 September 2018 |
Sep 22 2018, 06:14 AM
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#16
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
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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Sep 22 2018, 06:26 AM
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#17
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
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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Sep 22 2018, 06:42 AM
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#18
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
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.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Guest_mcmcmc_* |
Sep 22 2018, 08:32 AM
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#19
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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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Sep 22 2018, 08:59 AM
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#20
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
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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Sep 22 2018, 12:22 PM
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#21
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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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Sep 22 2018, 01:07 PM
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#22
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
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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Sep 22 2018, 01:27 PM
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#23
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
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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Sep 22 2018, 01:43 PM
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#24
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Junior Member Group: Members Posts: 57 Joined: 20-January 12 From: Florida Member No.: 6317 |
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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Sep 22 2018, 01:56 PM
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#25
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Newbie Group: Members Posts: 14 Joined: 30-September 14 Member No.: 7269 |
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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Sep 22 2018, 02:08 PM
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#26
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Member Group: Members Posts: 362 Joined: 12-June 05 From: Kiama, Australia Member No.: 409 |
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Sep 22 2018, 02:14 PM
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#27
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Newbie Group: Members Posts: 14 Joined: 30-September 14 Member No.: 7269 |
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Sep 22 2018, 03:30 PM
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#28
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
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... -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Sep 22 2018, 03:58 PM
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#29
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Senior Member Group: Members Posts: 2106 Joined: 13-February 10 From: Ontario Member No.: 5221 |
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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Sep 22 2018, 04:26 PM
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#30
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
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 -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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