Author Topic: JAXA Hayabusa2 Mission : General Thread  (Read 86445 times)

Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #520 on: 03/20/2019 05:14 pm »
Updated schedule:

March 20 - 22   Descent operation(CRA1)   
Week of April 1   Small Carry-on Impactor (SCI) operation
Week of April 22   Descent operation(CRA2)
Did they already perform CRA1 mission? My logger stopped working for several days and I didn't notice it! :-(


Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #521 on: 03/20/2019 05:30 pm »
There's a sped-up video of SpaceX's recent Crew Dragon docking to the ISS floating around, it might be instructive to take a look at that and notice... similarities.

Interesting video... but Crew Dragon movements appears in the order of mm or cm, while H2 wanders around by several dozens of cms (target is just 10 cm wide, H2 is 6m panel-to-panel).
« Last Edit: 03/20/2019 05:31 pm by mcgyver »

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #522 on: 03/21/2019 12:56 am »
http://www.hayabusa2.jaxa.jp/en/topics/20190320e_CRA1/

The Crater Search Operation (Pre-SCI): CRA1

Currently, we have scheduled the small carry-on impactor operation (SCI operation) for the first week in April. The purpose of the SCI operation is to create a crater on the surface of Ryugu, and it is important to be able to compare the asteroid surface before and after the SCI operation. Before performing the SCI operation, we therefore decided to observe the area where the crater is likely to be generated. This is the “Crater Search Operation (Pre-SCI)” (CRA1). The same observational procedure will be performed after the SCI operation and denoted “Crater Search Operation (Post SCI)” (CRA2).
The CRA1 operation will take place between March 20 – 22, 2019. Descent preparation work will start on the 20th and the descent will begin from the 21st. Observations at the lowest altitude reached (approximately 1.7km) will be from the 21st to 22nd and the spacecraft will ascend on the 22nd. Figure 1 shows the site that will be observed. This area includes the SO1 region that was observed during the Descent Observation Operation (DO-S01) conducted between March 6 – 8.

he operation schedule is known in Figure 2. Hayabusa2 begins its descent on March 21 at 08:57 JST (onboard time) with a speed of 0.4 m/s. On the same day at around 19:17 JST, the speed will be reduced to about 0.1 m/s. The spacecraft will continue to descend and reach the lowest point (altitude approximately 1.7km) on March 22 at around 03:32 JST and continuously observe at that altitude for a while. Hayabusa2 will begin to ascend at 05:08 JST and return to the home position. Note that the times listed here are the planned values and the actual operation times may differ.

Figure 1: Area to observe during the CRA1 operation (image credit: JAXA).
Figure 2: Schematic diagram of the CRA1 operation (image credit: JAXA).
Note: times listed here may differ from the actual operation.

Hayabusa2 Project
2019.03.15
(Translation 2019.03.20)

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0

Offline eeergo

Re: JAXA Hayabusa2 Mission : General Thread
« Reply #524 on: 03/21/2019 02:36 am »
There's a sped-up video of SpaceX's recent Crew Dragon docking to the ISS floating around, it might be instructive to take a look at that and notice... similarities.
Interesting video... but Crew Dragon movements appears in the order of mm or cm, while H2 wanders around by several dozens of cms (target is just 10 cm wide, H2 is 6m panel-to-panel).

Millimeters? Take into account Dragon is >4 meters large in all dimensions, while Hayabusa is ~1m. And clearly a probe designed for a fraction of the cost of Dragon-2, launched 5 years ago and with no requirements for crew safety wouldn't need any such level of precision, at least in rendezvous mode far from the surface.

The key word here, apart from what Ugordan has pointed out, is fuel economy. Dragon has literal boatloads of it, and much more margin for nominal operations in LEO. Hayabusa-2 has much less and has to economize as much as it can because of a myriad of possible problems (see Hayabusa-1) during its multi-objective proximity mission. Why would it need to stay within such a rigidly defined "box" instead of a looser one, when it's just trying to orient itself with respect to a marker?
-DaviD-

Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #525 on: 03/21/2019 07:43 am »
New mission started!
It's named "CRA1", and it will be a flyby of the area where a brand new crater will be soon created.



Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #526 on: 03/21/2019 10:35 am »
Slowing down:



Schedule:



Schedule is +9 hours w.r.t. my chart, which is GMT.


Arrival at destination altitude (1.7 km) is planned for 2019/03/22 03:32 JST, which is 2019/03/21 18:32 GMT.
Ascent should then begin at 05:08 JST / 20:00 GMT


Realtime image delivery not yet started, but should appear here  or here.
« Last Edit: 03/21/2019 10:43 am by mcgyver »

Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #527 on: 03/21/2019 06:03 pm »
Hovering in 3...2...1...




Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #528 on: 03/21/2019 06:07 pm »
....and hovering!





No images yet. :-(

Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142

Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #530 on: 03/22/2019 06:25 am »

Offline mcgyver

  • Full Member
  • ****
  • Posts: 637
  • milan, rome
  • Liked: 180
  • Likes Given: 142
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #531 on: 03/22/2019 06:31 am »

■ Plan of operation
• March 20 to 22: Crater search operation (in advance) (CRA1)   DONE
• April 4-6: Collision Equipment Operation (SCI)


■ Press Briefings, etc.
• April 2 14:00-Regular Press Briefings @ JAXA Tokyo Office
• April 5 8:30-Press Center opened @ JAXA Sagamihara Campus


http://fanfun.jaxa.jp/jaxatv/files/20190318_hayabusa2.pdf



Offline edzieba

  • Virtual Realist
  • Full Member
  • ****
  • Posts: 504
  • United Kingdom
  • Liked: 553
  • Likes Given: 30
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #532 on: 03/25/2019 05:20 pm »
There's a sped-up video of SpaceX's recent Crew Dragon docking to the ISS floating around, it might be instructive to take a look at that and notice... similarities.

Interesting video... but Crew Dragon movements appears in the order of mm or cm, while H2 wanders around by several dozens of cms (target is just 10 cm wide, H2 is 6m panel-to-panel).
Dragon is co-orbiting with a 'stationary' object (sharing very close to the same orbit, nonrotating relative to that orbit) and has an on-board active tracking system giving relative pose (position and orientation) with backup from off-board tracking of both itself and the ISS.
Hayabusa2 is not orbiting Ryugu during descent operations, but is instead 'flying around' a spinning misshapen object. There is no passive stability here, and the only positioning systems available are the altimeter (which gives a distance to a particular small patch on the surface depending on Hayabusa2's orientation, not to the surface directly between Hayabusa2 & Ryugu's CoM, or the distance to the CoM directly, or to an average over a large area, etc) and a 2D vector to the pre-placed marker (itself positioned in Ryugu-relative Z via analysis of camera images). As mentioned, Hayabusa2 is also doing so while trying to use the absolute minimum amount of propellant possible, so until the final approach will be using the most relaxed pose tolerance possible.

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #533 on: 03/28/2019 12:17 pm »
next press conference about sci operation.

2019/03/18 15:00-16:00(JST)
2019/03/18 06:00-07:00(UST)

press release in english
http://www.hayabusa2.jaxa.jp/en/enjoy/material/press/Hayabusa2_Press20190318_ver8_EN.pdf

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #534 on: 03/29/2019 03:37 am »
http://www.hayabusa2.jaxa.jp/en/topics/20190328e_illustration/
Revised illustrations of Hayabusa2
At the beginning of the Hayabusa2 Project, realistic illustrations were drawn by Akihiro Ikeshita. These illustrations have now been revised to match the actual asteroid Ryugu. These illustrations show our arrival at Ryugu and the first touchdown.

※ In the illustrations posted here, the Hayabusa2 Project asked Akihiro Ikeshita to draw the images. Please credit as follows:
・The illustration copyright is owned by Akihiro Ikeshita.
・Illustrations may be freely used for personal use, but please contact Akihiro Ikeshita for further use. (Akihiro Ikeshita’s contact information is [email protected])

Hayabusa2 Project
2019.03.28


and next press conference

2019/04/02(Tue) 14:00-15:30(JST)
2019/04/02(Tue) 05:00-06:30(UST)
« Last Edit: 03/29/2019 03:39 am by yoichi »

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #535 on: 04/02/2019 06:34 am »
and next press conference

2019/04/02(Tue) 14:00-15:30(JST)
2019/04/02(Tue) 05:00-06:30(UST)

press release in japanese
http://fanfun.jaxa.jp/jaxatv/files/20190402_hayabusa2.pdf

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #536 on: 04/02/2019 06:36 am »
Mission Control Live: Hayabusa2 SCI Operation

Mission Control Live: Hayabusa2 SCI Operation 
10:15 AM(JST) - April 5, 2019 
JAXA Sagamihara Campus

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #537 on: 04/03/2019 10:39 am »
http://www.hayabusa2.jaxa.jp/en/enjoy/material/

April 2, 2019:
      Material-original (in Japanese) (Apr. 3, uploaded),
          http://www.hayabusa2.jaxa.jp/en/enjoy/material/press/Hayabusa2_Press20190402_ver5.pdf
  Material-English translation (Apr. 3, uploaded)
          http://www.hayabusa2.jaxa.jp/en/enjoy/material/press/Hayabusa2_Press20190402_ver4_en.pdf
  • Descent operations results (CRA1)
  • Small Carry-on Impactor(SCI) operation

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0
Re: JAXA Hayabusa2 Mission : General Thread
« Reply #538 on: 04/04/2019 04:21 am »
http://www.hayabusa2.jaxa.jp/en/topics/20190403e_SCI_Schedule/

SCI (Small Carry-on Impactor)Operation Schedule

The Small Carry-on Impactor (SCI) operation will take place between April 3 – 6. This is an impact experiment to create an artificial crater in a designated area. Please see the table and figure below for information regarding the operation schedule.

Figure 1: Schematic diagram of the SCI operation part #1. The operation from the home position to SCI separation is shown here. The graph on the left shows the change in the spacecraft position with time. On the right, the spacecraft position is shown in the x-z coordinate system (home position coordinate system). The times listed are the scheduled time and may differ from actual operations. (Image credit: JAXA.)

Figure 2: Schematic diagram of the SCI operation part #2. The operation from SCI separation to the return to the home position is shown. In this figure, the position of the spacecraft in the x-z coordinate system is shown schematically. The time is the scheduled time and may differ from actual operations. (Image credit: JAXA.)

Figure 3: Area selected for creating the artificial crater during the SCI operation. The yellow ellipse in the left figure described as the “CRA1 operation observation area” roughly corresponds to the crater generation area (blue circle in the right figure). (Image credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University, University of Aizu, AIST.)

Offline yoichi

  • Full Member
  • ****
  • Posts: 830
  • Liked: 372
  • Likes Given: 0

Tags: