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Mission: Hayabusa 2
Explorer1
post Aug 23 2018, 03:57 PM
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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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hendric
post Aug 23 2018, 04:06 PM
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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.




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alan
post Aug 29 2018, 09:29 PM
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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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Explorer1
post Aug 29 2018, 09:38 PM
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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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charborob
post Aug 31 2018, 10:57 AM
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Many images of Ryugu on this page.
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pandaneko
post Aug 31 2018, 12:11 PM
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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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Roman Tkachenko
post Sep 1 2018, 08:01 AM
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Ryugu from an altitude of 6km


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pandaneko
post Sep 1 2018, 11:29 AM
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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.

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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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pandaneko
post Sep 1 2018, 11:37 AM
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I wonder if there can be gentle collisions between asteroids.

P
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Explorer1
post Sep 1 2018, 02:32 PM
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QUOTE (pandaneko @ Sep 1 2018, 06:37 AM) *
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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alan
post Sep 1 2018, 05:52 PM
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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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Paolo
post Sep 5 2018, 07:10 PM
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QUOTE (charborob @ Aug 31 2018, 12:57 PM) *
Many images of Ryugu on this page.


English version is finally available
http://www.hayabusa2.jaxa.jp/en/topics/20180905e/

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PaulH51
post Sep 8 2018, 01:43 AM
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The 'Haya2Now' website is now in English! Just rollover each panel to find out more: Link
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Paolo
post Sep 8 2018, 05:52 AM
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and two recent short stories (in English):

Boulders on the surface of asteroid Ryugu
Thermography of Ryugu by the TIR
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Hungry4info
post Sep 11 2018, 01:52 PM
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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/
Attached thumbnail(s)
Attached Image
 


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