Mission: Hayabusa 2 |
Mission: Hayabusa 2 |
Aug 23 2018, 03:57 PM
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#541
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Senior Member Group: Members Posts: 2073 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Landing site selection seems to be complete, both for Minerva II landers and MASCOT. http://astronomy2018.cosmoquest.org/newspa...asteroid-ryugu/
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Aug 23 2018, 04:06 PM
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#542
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Director of Galilean Photography Group: Members Posts: 896 Joined: 15-July 04 From: Austin, TX Member No.: 93 |
That article also mentions the mission scientists commenting on the hydration of the minerals being less than expected.
QUOTE The surface of Ryugu is not exactly like the science team expected. “Somehow, we thought that Itokawa is a template for surface conditions for an asteroid,” laughs Fujimoto. Instead, Ryugu has a rough surface everywhere without smooth flat patches, is darker than anticipated, and may have fewer hydrated minerals. -------------------- Space Enthusiast Richard Hendricks
-- "The engineers, as usual, made a tremendous fuss. Again as usual, they did the job in half the time they had dismissed as being absolutely impossible." --Rescue Party, Arthur C Clarke Mother Nature is the final inspector of all quality. |
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Aug 29 2018, 09:29 PM
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#543
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
Interesting article discussing what was revealed by the first Hayabusa mission:
Particles collected by Hayabusa give absolute age of asteroid Itokawa Japanese scientists, including those from Osaka University, closely examined particles collected from the asteroid Itokawa by the spacecraft Hayabusa, finding that the parent body of Itokawa was formed about 4.6 billion years ago when the solar system was born and that it was destroyed by a collision with another asteroid about 1.5 billion years ago. Their research results were published in Scientific Reports. Read more at: https://phys.org/news/2018-08-particles-hay...teroid.html#jCp |
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Aug 29 2018, 09:38 PM
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#544
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Senior Member Group: Members Posts: 2073 Joined: 13-February 10 From: Ontario Member No.: 5221 |
http://www.hayabusa2.jaxa.jp/en/news/status/
MINERVA II 1 set for landing September 23rd, MASCOT landing for October 3rd! They are not waiting around! |
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Aug 31 2018, 10:57 AM
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#545
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Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Many images of Ryugu on this page.
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Aug 31 2018, 12:11 PM
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#546
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
I realise that there is a discrepancy between Japanese and English top pages. I will translate captions on the top page photos tomorrow.
P |
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Sep 1 2018, 08:01 AM
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#547
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Junior Member Group: Members Posts: 80 Joined: 18-October 15 From: Russia Member No.: 7822 |
Ryugu from an altitude of 6km
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Sep 1 2018, 11:29 AM
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#548
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
Captions of the latest photos of Hayabusa 2 main page are as follows.
3rd photo from left of the main page top. Its caption is: As it has turned out there are more boulders on Ryugu than anticipated. There were also many of them on Itokawa, but boulder density may be larger on Ryugu. These two photos are based on those taken from the home position on 30 June. Green crosses are marked on boulders between 8 and 10 meters across. Photo 1: Longtitude 300 degrees and the north pole is up. Photo 1 shows a lessor dense surface and photo 2 denser surface. (However, this analysis may change later as more is conducted). Either way there are hundreds of them on both photos, and their distribution may be a clue to the kind of impact Ryugu had in the past. Photo 2: Taken of longtitude 60 degrees surface. -------------------- 2nd photo from left of the main page top. Its caption is: Hayabusa 2 is now looking at Ryugu with its thermal infrared camera and photo 1 was taken from the home position (20km height) on 30 June 2018 (16:02-23:45 JST). Image was taken at 8 minutes interval for one complete self-revolution and one pixel corresponds to about 20m. Ryugu was at 0.987au from the Sun. (Credits now include DLR, Max Planck and Stiring Unibersity. P) Red areas are hotter. TIR photos can show even shade areas which cannot be seen on visible light pictures. Even craters and large boulders show up thermal signatures. We also notice temp. difference between northern and southern hemispheres due to the tilted spin axis. Right now, upper hemisphere (souther hemisphere) is in summer time, showing seasonal variation in temperature. Highest temp. is about 100 degrees C and lowest at around room temp. on earth. Hayabusa 2 's mission includes asteroid formation histroy from the surface property found by TIR. TIR data also shows us possible location of landing sites with millimeter sized particles. What follows is an interview with a former JAXA member now at a university. He was involved in Hayabusa 2 project right from its conception. Q.: What kind of work were you involved at JAXA? A.: I was responsible for TIR and NIRS3. Actual making of the devices was done by Meisei Denki company in the town of Isezaki in Gunma prefecture. I visited them many, many times to check everythig about the devices. Q.:What can Hayabusa 2 tell us? A.: These asteroids are supposed to retain features soon after their formation in the solar system because they lack atmosphere and convection.Of particular interest is water (H2O) and it was anticipated that asteroids like Ryugu had more water than earth in terms of weight ratio. Earth rather has less water and it is a problem to be clarified. Where has the water difference gone to and if water was supplied later during the evolutional history of earth what were its mechanisms. Several different scinarions have been proposed and Hayabusa 2 will be looking at these problems. Q.: What will you be doing from now? A.:NIRS3 apart, I will be looking at thermographical pictures of Ryugu. I have made a GIF movie of Ryugu based on the data obtained on 30 June. Continous data acqusition of surface temp. can show thermal and physical properties of surface materials. Rcent discovery of organic compounds contained in meteorites may mean that we can find them even on Ryugu. RIR can guide us to lower temp. regions where organic compounds may still survive and also help us find termally safe landing locations for sampling. ------------------------- 1st photo from left of the main page top. Its caption is: It is more than one month since LIDAR was first activated. The photo shows location of laser reflections from Ryugu.。 Usually, Hayabusa's attitude is such that LIDAR faces equatorial regions. We have changed this attitude twice by now along the spin axis (attitude scanning). We still have much less data on polar regions, but we are starting to see global pictures of Ryugu in so doing. In ordert to obtain accurate pictures we must make sure that we know Hayabusa's orbit accurately. Right now its uncertainty is a few hundred meters. Yes, it is amazing that we know Hayabusa's orbit this accurately whe it is so far away from us, but this uncertainty is too much to measure the shape of Ryugu accurately enough as Ryugu is ony 900 meter across. So, we do LIDAR data to improve on orbital accuracy and this improved orbital information has been provided to other teams so that they can also better decide on landing locations etc. P |
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Sep 1 2018, 11:37 AM
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#549
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
I wonder if there can be gentle collisions between asteroids.
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Sep 1 2018, 02:32 PM
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#550
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Senior Member Group: Members Posts: 2073 Joined: 13-February 10 From: Ontario Member No.: 5221 |
I wonder if there can be gentle collisions between asteroids. P Not since the early days of the solar system, when accretion as still happening. Relative velocities are far too different now, or else a planet would have accreted there. Contrast with comet 67P, which is thought to be the product of a slow collision between two smaller bodies (see: https://arxiv.org/abs/1505.07021 ) |
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Sep 1 2018, 05:52 PM
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#551
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
If an asteroid is broken up in a collision but some of the pieces remain bound by gravity a gentle collision between two of the fragments could occur.
I believe that is what happened to Itokawa. |
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Sep 5 2018, 07:10 PM
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#552
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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 |
Many images of Ryugu on this page. English version is finally available http://www.hayabusa2.jaxa.jp/en/topics/20180905e/ |
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Sep 8 2018, 01:43 AM
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#553
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Senior Member Group: Members Posts: 2425 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
The 'Haya2Now' website is now in English! Just rollover each panel to find out more: Link
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Sep 8 2018, 05:52 AM
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#554
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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 |
and two recent short stories (in English):
Boulders on the surface of asteroid Ryugu Thermography of Ryugu by the TIR |
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Sep 11 2018, 01:52 PM
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#555
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Senior Member Group: Members Posts: 1414 Joined: 26-July 08 Member No.: 4270 |
It looks like the operation has started. This page (link below) is updating occasionally with new NavCam images, I've attached the most recent as of the time of this post.
http://www.hayabusa2.jaxa.jp/en/galleries/onc/nav20180911/ -------------------- -- Hungry4info (Sirius_Alpha)
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