Author Topic: JAXA Hayabusa2 Mission : General Thread  (Read 55625 times)

Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #100 on: 08/07/2018 12:24 AM »
https://twitter.com/haya2e_jaxa/status/1026623631781064705

[email protected]‏ @haya2e_jaxa 
[GravMO] Aug. 7, 08:42 JST we reached “GATE 4”: confirmation of arrival at minimum altitude, end of gravity measurement operation. Commence rising ΔV.
We’ve reached a min altitude of (preliminary report) 851m! The command to rise is confirmed & we have begun to ascend at ~0.2m/s
9:18 - 2018年8月7日


« Last Edit: 08/07/2018 04:10 AM by yoichi »

Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #101 on: 08/07/2018 08:28 AM »

Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #102 on: 08/15/2018 12:36 AM »
https://twitter.com/MASCOT2018/status/1029382403456942080
MASCOT Lander @MASCOT2018
Check out my 10 candidate #asteroidlanding sites. Which one will it be?
In the image, possible touchdown areas are shown in light blue & stabilisation areas after bouncing in dark blue. Numbers don’t represent a ranking
©CNES


Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #103 on: 08/21/2018 01:56 PM »
http://www.hayabusa2.jaxa.jp/en/news/status/
Aug. 21, 2018 
★ Hayabusa2 status(the week of 2018.8.13)★
After returning from the Gravity Measurement Operation, Hayabusa2 operated in BOX-A (the home position). Japan experienced very unsettled weather this week, with thunderstorm around the Usuda Deep Space Centre. In addition to this, thunderstorm occurred at US Goldstone ground station when we operated Hayabusa2 from there. Weather at the ground stations is concerning. Also this week was an active discussion on landing locations. On August 17, a large number of international Project Members gathered to engage in this debate. From August 18, BOX-B operations began and the spacecraft starting moving from BOX-A.
2018.8.21 M.Y.


Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #104 on: 08/23/2018 07:00 AM »
Candidates for landing sites for the Hayabusa2 mission

Online jacqmans

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #105 on: 08/23/2018 11:47 AM »
DLR German Aerospace Center, Corporate Communications, Linder Hoehe, 51147 Koeln, Germany - http://www.DLR.de/en/

Press release, 23 August 2018

Landing site on the asteroid Ryugu determined - Next stop for MASCOT: A southern location, pleasant temperatures and a beautiful view

Not too hot and not too cold. Not too many boulders, nor too few. Easily accessible and scientifically exciting. Meeting the requirements that the Mobile Asteroid Surface Scout (MASCOT) team had for the landing site on the asteroid Ryugu was no easy
task. "However, we have now decided on an almost perfect landing site," says Ralf Jaumann from the German Aerospace Center (Deutsches Zentrum fuer Luft- und Raumfahrt; DLR) Institute of Planetary Research, who is Principal Investigator of the MASCOT
landing probe and responsible for the lander's MasCam camera experiment. DLR Project Manager Tra-Mi Ho is also satisfied with the selection of the landing site: "For the operation of our lander, the chosen landing site was among the favourites from
the very start." In consultation with more than 100 international and national partners, the MASCOT landing site was selected from 10 potential candidates, and announced on 23 August 2018. MASCOT's landing is scheduled for 3 October 2018. The locations
at which the Hayabusa2 probe is expected to take soil samples have also been designated, as have the sites where the three MINVERVA-II rovers will be placed on the asteroid's surface. 

Located at approximately 315 degrees east and 30 degrees south, the place at which MASCOT is supposed to land on the primordial celestial body and carry out measurements on the asteroid's surface using four instruments is, at the moment, still simply
called 'MA-9'. The landing site area has several advantages. Firstly, it is far enough from the regions in which Hayabusa2 will descend to the surface and take soil samples – in this way, MASCOT and Hayabusa2 will not get in each other's way as they
perform their activities. Secondly, the landing site lies in Ryugu's southern hemisphere, so with the data collected by Hayabusa2 at the equator and MINERVA in the northern hemisphere, scientists will be able to gain good coverage of and investigate
the 950-metre-diameter asteroid.

Numerous boulders and fresh material

Temperatures are expected to reach up to 47 degrees Celsius during the asteroid day and drop to minus 63 degrees Celsius at night. This is in line with the desired framework conditions for the operation of the instruments and for the lander's battery.
In the vicinity of the landing site, there are numerous boulders up to 30 metres tall, but the really big rocks are not located in the MA-9 region. Images acquired by the optical navigation camera on the Hayabusa2 probe indicate that the landing site
area probably holds fresher material that had little exposure to cosmic radiation, the particle flow of solar winds, as well as interplanetary dust – and is therefore still very primordial and in an unchanged state. 

Spoilt for choice

Making a final selection from 10 potential landing sites was not easy for the scientists and engineers. After all, every team of instrument experts should be able to get the working conditions and data that it expects. For example, the MicrOmega infrared
hyperspectral microscope of the Institut d'Astrophysique Spatiale (IAS) would have preferred slightly cooler temperatures during the asteroid day. The MAG magnetometer of the Technical University Braunschweig would have favoured very large boulders
for its measurements. By contrast, the MasCam camera and the MARA radiometer – both instruments developed by the DLR Institute of Planetary Research – enjoy almost ideal conditions for their scientific work because they have a view of boulders on the
horizon and can examine fresh asteroid material. Ultimately, the conditions that the landing site offers are very favourable for the lander and all instruments on board. "From our perspective, the selected landing site means that we engineers can guide
MASCOT to the asteroid's surface in the safest way possible, while the scientists can use their various instruments in the best possible way," says Tra-Mi Ho, Project Manager at the DLR Institute of Space Systems. "But we are also aware: there seem
to be large boulders across most of Ryugu's surface, and barely surfaces with flat regolith. Although scientifically very interesting, this is also a challenge for a small lander and for sampling."

About the Hayabusa2 mission and MASCOT

Hayabusa2 is a Japanese space agency (Japan Aerospace Exploration Agency; JAXA) mission to the near-Earth asteroid Ryugu. The German-French lander MASCOT on board Hayabusa2 was developed by the German Aerospace Center (Deutsches Zentrum für Luft- und
Raumfahrt; DLR) and built in close cooperation with the  French space agency CNES (Centre National d'Etudes Spatiales). DLR, the Institut d'Astrophysique Spatiale and the Technical University of Braunschweig have contributed the scientific experiments
on board MASCOT. The MASCOT lander and its experiments are operated and controlled by DLR with support from CNES and in constant interaction with the Hayabusa2 team.

The DLR Institute of Space Systems in Bremen was responsible for developing and testing the lander together with CNES. The DLR Institute of Composite Structures and Adaptive Systems in Braunschweig was responsible for the stable structure of the lander.
The DLR Robotics and Mechatronics Center in Oberpfaffenhofen developed the swing arm that allows MASCOT to hop on the asteroid. Das DLR Institute of Planetary Research in Berlin contributed the MasCam camera and the MARA radiometer. The asteroid lander
is monitored and operated from the MASCOT Control Center in the Microgravity User Support Center (MUSC) at the DLR site in Cologne.

Online Olaf

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #106 on: 09/11/2018 07:32 AM »
https://twitter.com/haya2e_jaxa/status/1039409504364851200
Quote
[TD1-R1] Today (Sept. 11) at 15:46 JST, Hayabusa2 was confirmed to have began the descent from the home position (about 20km altitude) as planned. The onboard time when the descent started was 15:27.

Online Olaf

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #107 on: 09/11/2018 01:16 PM »
http://www.hayabusa2.jaxa.jp/en/topics/20180911e/
Schedule for Touchdown 1 Rehearsal 1 (TD1-R1)
Quote
The first touchdown by Hayabusa2 to collect samples from the asteroid surface is planned for the end of October. The first rehearsal for this operation will be held from September 10 – 12. “Touchdown 1 Rehearsal 1” is abbreviated to TD1-R1. At TD1-R1, the Hayabusa2 will approach the surface of Ryugu to an altitude of less than 40 m. The spacecraft will then rise without landing. The purpose of this rehearsal is to monitor the operation of the spacecraft during touchdown and investigate the safety of the touchdown candidate sites by imaging the surface of Ryugu in their vicinity from a low altitude. The schedule for the TD1-R1 operation is shown in the table below. The actual operation will occur while assessing the situation at that time, so do note that procedures may not always be on schedule.

Online theinternetftw

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #108 on: 09/11/2018 07:26 PM »
Here's that schedule.  DSN station switching has been removed to keep it from running down the page.

Online catdlr

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #109 on: 09/12/2018 02:08 AM »
3D Visualization of Asteroid Ryugu


NEW HORIZONS v2.0
Published on Sep 11, 2018

This simulated flyover was created using data taken by JAXA's Hayabusa2 spacecraft

https://www.youtube.com/watch?v=DDTBBggihiw?t=001

Tony De La Rosa

Offline eeergo

Re: JAXA Hayabusa2 Mission : General Thread
« Reply #110 on: 09/12/2018 10:32 AM »
Reports Hayabusa-2 reached 600 m in altitude before the descent being aborted due to low reflectivity of Ryugu's surface making it impossible to perform detailed LIDAR measurements.
-DaviD-

Online Olaf

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #111 on: 09/18/2018 05:48 PM »
https://twitter.com/haya2e_jaxa/status/1041993177169711104
Quote
This week we will deploy the MINERVA-II1 rovers! Tomorrow (Sept 19) is the preparatory operation prior to the descent and on the 20th, the spacecraft will start descending towards Ryugu. The separation of MINERVA-II1 is scheduled for the 21st. (Hayabusa2 Project)

Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #112 on: 09/19/2018 08:04 AM »

Just for reference, as  MINERVA rovers launch is upcoming:


In Minerva rovers  there are 4 different locomotion system to be tested: motors, springs, whatelse,..
http://mineta-lab.yz.yamagata-u.ac.jp/HAYABUSA2.html
http://www.dlr.de/pf/Portaldata/6/Resources/lcpm/abstracts/Abstract_Yoshimitsu_T.pdf
http://www.astro.mech.tohoku.ac.jp/~nagaoka/papers/2016isairas_knaga1.pdf

Preliminary proposal from Yoshimitsu/Kubota:

http://www.hayabusa.isas.jaxa.jp/kawalab/astro/pdf/2013C_8.pdf


Old study dated 2005:
http://ewh.ieee.org/conf/ras2005/workshops/PlanetaryRovers/08kubota/_kubota-WF-01-08.pdf


Previous version (Minerva I on Hayabusa 1):

https://pdfs.semanticscholar.org/9495/4d807e7fa94897a36cb0a9af6112f16ed417.pdf


How to find them once they move?!?
https://www.jstage.jst.go.jp/article/tjsass/59/3/59_T-15-58/_pdf




PRE-ARRIVAL DEPLOYMENT ANALYSIS AND TRAJECTORY RECONSTRUCTION OF HAYABUSA2 ROVERS


And dont' forget time zones!


GMT schedule is as follows (time is approximate and is just JST converted to GMT):

18 september 15:00: MINERVA operations start
19 september 15:00: rovers deployement
20 september 15:00: rovers landing
« Last Edit: 09/19/2018 08:07 AM by mcgyver »

Online Olaf

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #113 on: 09/19/2018 06:20 PM »

Offline Svetoslav

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #114 on: 09/20/2018 07:03 AM »
And so it begins! Descending has started at speed 40 cm/sec. Live images here:

http://www.hayabusa2.jaxa.jp/en/galleries/onc/nav20180920/

Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #115 on: 09/20/2018 08:27 AM »
http://www.hayabusa2.jaxa.jp/en/topics/20180920e/
MINERVA-Ⅱ1 Schedule for deployment operation

Offline mlindner

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #116 on: 09/20/2018 09:19 AM »
I attached an mkv mjpeg of the descent images so far and a lower quality gif (with optimized palette). I'll try to keep it updated when not sleeping/at work.
« Last Edit: 09/21/2018 05:28 AM by mlindner »
Internal combustion engine in space. It's just a Bad Idea.TM - Robotbeat

Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #117 on: 09/20/2018 12:53 PM »

Operations schedule in GMT:


05:10 - Start descent from 20 km Done 05:08, Confirmed 05:26
11:00 - 13 km from Center Of Gravity of Ryugu
15:30 - 5 km from CoG, deceleration from 0.40 to 0.10 m/s (from 1.44 km/h to 0.36 km/h)
18:30 - 4 km from CoG


21 september
00:00 - 2 km from CoG
00:10 - Altitude 1500 meters above surface
03:00 - Altitude 500 meters above surface
03:40 - Altitude 250 meters above surface
04:00-04:30 - Altitude 60 meters - Rover deployment, H2 raises again


Rovers diameter: 18 cm; 60 m away they will be 30 pixel wide in ONC-T, 3 pixel in ONC-W1.


http://www.hayabusa2.jaxa.jp/en/topics/20180920e/


Altitude 15 km confirmed at 08:30 GMT

By now it should be already at around 6 km.
« Last Edit: 09/20/2018 12:54 PM by mcgyver »

Online Olaf

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #118 on: 09/20/2018 01:42 PM »
https://twitter.com/haya2_jaxa/status/1042751796043669504
Google translation
Quote
【MINERVA - Ⅱ 1】 September 20 21: 03 JST: The altitude of the spacecraft is about 10 km. Round-trip propagation delay is 35 minutes 22.6 seconds.

Online Olaf

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #119 on: 09/20/2018 01:43 PM »
https://twitter.com/haya2_jaxa/status/1042768887614332930
Google translation
Quote
【MINERVA - Ⅱ 1】 September 20 22: 30 JST: The height of the spacecraft has cut off 8 km.
It is operated 24 hours a day on a daily basis. Shifts have shifted to a shift in late night.

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