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JAXA Hayabusa2 Mission : General Thread
by
Galactic Penguin SST
on 08 Jun, 2018 02:22
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Starting this thread since the spacecraft is about to reach its destination this month and it has already switched off its ion engines for final approach, reaching about 20 km from Ryugu on June 27!
Launch thread:
https://forum.nasaspaceflight.com/index.php?topic=22015.0Firstly, here are the slides from a press conference yesterday (in English) about the mission status and future plans:
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#1
by
mcgyver
on 08 Jun, 2018 07:44
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#2
by
mcgyver
on 09 Jun, 2018 19:18
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We've done our 1st Trajectory Correction Manoeuvre (TCM01) on June 8 ~12:30-13:40 JST. Using thrusters, Hayabusa2 was accelerated by ~24cm/s (-x), 5cm/s (-y), 14cm/s (z). The distance from the spacecraft to the asteroid was ~1900km & the relative speed after TCM01 was ~2.35m/s.[/font][/size]
https://twitter.com/haya2e_jaxa/status/1005080912340512768Now at 1594 km.
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#3
by
yoichi
on 11 Jun, 2018 06:28
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http://www.hayabusa2.jaxa.jp/topics/information_e/Jun. 11, 2018
We have carried out the second optical navigation trajectory correction manoeuvre (TCM02)On June 11, 2018 at around09:30 - 10:40 JST, the thrusters were fired several times to give an acceleration of 13 cm/s (x-direction), 1 cm/s (-y-direction), 26 cm/s (z-direction). The distance from the spacecraft to the asteroid during the manoeuvre was about 1320km and their relative speed after TCM02 was about 2.1m/s. Until now, Hayabusa2 was approaching Ryugu from the side. But with TCM02, the asteroid is now directly in front of the spacecraft, along the direction of travel.
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#4
by
mcgyver
on 11 Jun, 2018 07:38
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#5
by
yoichi
on 11 Jun, 2018 09:37
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http://www.hayabusa2.jaxa.jp/topics/20180611b_e/Ryugu seen from a distance of 1500kmFigure 2 shows a photograph taken at approximately the same time but using an exposure of about 0.09 seconds. Here, only Ryugu is imaged as a point and the background stars are now too faint to be seen. In expanding the section of image that contains Ryugu, the asteroid can be seen to have a diameter of about 5 or 6 pixels but this is still not sufficient to see the shape. However, from this image is does seem that Ryugu is not elongated like Itokawa.
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#6
by
mcgyver
on 11 Jun, 2018 12:51
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#7
by
mcgyver
on 12 Jun, 2018 06:55
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Found additional infor about the "mysterious flyng camera" DCAM3 :
DCAM 3
Isolated camera
It is a camera separated from the main unit. DCAM was first adopted in solar sail experiment machine "Ikaros". Hayabusa 2 uses a collision device, impactor to expose samples of deep underground asteroids, but it is a camera that shoots the situation. Two of digital cameras and analog cameras are installed.
We shoot so that both analog cameras that can acquire continuous images with low resolution and digital cameras that can intermittently acquire high resolution images will compensate each other.
(google translation)
http://spacenuclear.jp/spacecrafts/hayabusa23.htmlAs far as I can understand (but no info available around), camera has no propulsion system, it's just stabilized by spinning; it will be just "left behind" by H2 while moving "down" toward the "dark side" of the asteroid to use it as a shield against "shrapnel" produced by impact of SCI.
Also found some new images never seen before but ONC cameras (ONC-T and ONC-W1) are still barely visible, they are very tiny w.r.t. all other instruments!
http://spacenuclear.jp/spacecrafts/hayabusa23.htmlInteresting (but useless because all captions are in japanese...) comparison between Hayabusa 1 and Hayabusa 2:
http://www.hayabusa2.jaxa.jp/mission/orbiter/H2 now at 1100 km from surface; possible resolution for new images:
110m/pixel
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#8
by
Lampyridae
on 12 Jun, 2018 08:23
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I'll take a crack at it with my bad Japanese.
1. Ka-Band antenna allows more data to be transmitted
2. Ion engines seem to be more powerful
3. MASCOT rover provided by France and Germany
4. More reaction wheels (4 vs 3)
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#9
by
mcgyver
on 13 Jun, 2018 06:53
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#10
by
mcgyver
on 13 Jun, 2018 13:05
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I found source of raw data used by hayabusa page:
http://www.hayabusa2.jaxa.jp/hy2sc2/data/hy2_trj.txtAccording to page javascript source, this should be the interpretation of the columns (these are the names of the variables):
Date:1) mjd
2) epoch
Position:3) x_hp
4) y_hp
5) z_hp
Speed:6) vx_hp
7) vy_hp
8 ) vz_hp
Lidar enabled (since june 26th):9) lidar_hit
Let's see if future data will change, which would mean that simulated data are replaced by recorded data.
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#11
by
mcgyver
on 14 Jun, 2018 07:14
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#12
by
mcgyver
on 14 Jun, 2018 07:33
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#13
by
mcgyver
on 15 Jun, 2018 06:27
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#14
by
Chris Bergin
on 15 Jun, 2018 20:35
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#15
by
plutogno
on 16 Jun, 2018 11:26
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#16
by
Star One
on 16 Jun, 2018 11:40
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Looks curiously diamond shaped.
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#17
by
Svetoslav
on 16 Jun, 2018 12:39
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I am extremely pleased about how fast JAXA distributes images to the public! I still remember the Rosetta debacle with OSIRIS images, but now... now we had the chance to follow the mission so closely.
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#18
by
yoichi
on 16 Jun, 2018 13:06
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first hints of surface features from 700 km
http://www.hayabusa2.jaxa.jp/topics/20180616je/index.html
english
http://www.hayabusa2.jaxa.jp/topics/20180616je/index_e.htmlFrom a distance of about 700km, Ryugu's rotation was observed.Using the ONC-T (Optical Navigation Camera - Telescopic), asteroid Ryugu was photographed continuously from June 14, 2018 at around 21:00 JST through to June 15, 2018 at around 05:10 JST. Figure 1 shows a looped animation of the 52 captured images.
The distance to Ryugu when the images were captured was between about 700 - 650 km. In these photographs, Ryugu is approximately 12 - 13 pixels in diameter. The animation in Figure 1 shows the photographs after image processing has been performed to smooth between the pixels so that the asteroid’s surface looks smooth.
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#19
by
vapour_nudge
on 16 Jun, 2018 14:02
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It reminds me of the rotating cube in the original series Star Trek episode “The Corbomite Maneuver”
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