Author Topic: JAXA Hayabusa2 Mission : General Thread  (Read 245490 times)


Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #301 on: 10/16/2018 10:43 am »
Found this document about MASCOT2, which will derive from MASCOT and will explore the moon of an asteroid (Didymoon); quite similar to MASCOT, apart from solar panel and rechargeable batteries, not installed on MASCOT due to time- and mass-constraints.


ftp://ssh.esac.esa.int/pub/mkueppers/AIMScienceMeeting/Presentations/Session%204/25_Ulamec_Mascot2.pdf

Online plutogno

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #302 on: 10/16/2018 12:03 pm »
Found this document about MASCOT2, which will derive from MASCOT and will explore the moon of an asteroid (Didymoon)

that mission has not been approved by ESA, and a reduced version is now being studied, which may never fly in the end.
I wouldn't be holding my breath for it...

Offline mcgyver

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Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #304 on: 10/22/2018 09:08 am »
Hayabusa 2 Press conference
about TD1-R1-A and TD1-R3
2018/10/23(Tue) 16:00-17:00(JST)
2018/10/23(Tue) 07:00-08:00(UST)


press release in english
http://www.hayabusa2.jaxa.jp/en/enjoy/material/press/Hayabusa2_Press20181023_ver6_en.pdf
« Last Edit: 10/23/2018 09:44 am by yoichi »

Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #305 on: 10/23/2018 10:00 am »
Japanese press release is out:
http://fanfun.jaxa.jp/jaxatv/files/20181023_hayabusa2e.pdf

LRF properly worked at low altitude during TD1-R1a:  used between 27m and 25m, well matching with LIDAR reading (page 9).

Next time a target marker/ball will be used.


Tomorrow TD1-R3 will be performed:
24/10 03:00 JST: descent starts
24/10 23:00: 5000m
25/10 12:00: lowest altitude

GMT times:
23/10 18:00 Descent starts
24/10 14:00 5000m
25/10 03:00 Lowest altitude


Follow the events on the simulator! :-)
https://programmi.000webhostapp.com/hayabusa2/simulator/simulator3.html



Google Translate:

On the 23rd to 25th October, we perform the third rehearsal for touchdown.
■ Goal
• Confirm the accuracy of navigation guidance control at low altitude by doing the following.
• Feed back measured values by LRF (laser range finder) to the control of the spacecraft.
• If the condition is satisfied, detach the target marker.
• Track detached target markers


Sequence:
1)Using LIDAR While speed Descent with 10 cm
2)Altitude about 25 m LRF advanced control start
3)To the asteroid's rotation speed For horizontal synchronization Thrust thruster injection
4)Push the TM toward the ground surface To separate it Drop a few meters into
5)TM is tracked by the camera While maintaining a height of about 20 m Possession
6)After tracking TM Rise, altitude 20 km Back to home position


Target Markers (TM) features:
• [/size]Size of body (ball): diameter about 10 cm
• Retroreflective film on the surface
• 4 bars: rolling prevention
• A large number of polyimide globules inside
• First to be separated: B
• Inside the target marker, a sheet with a name written on the project from an ordinary person is loaded






Next press conference scheduled 8 november, and possibly 6 december.
« Last Edit: 10/23/2018 10:06 am by mcgyver »

Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #306 on: 10/23/2018 10:18 am »
This file logs some telemetries from Hayabusa:
https://programmi.000webhostapp.com/hayabusa2/simulator/ONC_A-log.txt


Last 12+1 columns are the cumulative times the thrusters have been on and the calculated vertical speed.
It should be possible to see there when the horizontal thrusters will be turned on to match the horizontal speed of the asteroid... but I don't know which ones they are!


Telemetries are recorded from this JAXA file.
« Last Edit: 10/23/2018 12:24 pm by mcgyver »

Offline mcgyver

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Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #308 on: 10/24/2018 01:02 am »
TD1-R3 operation plan

Offline yoichi

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« Last Edit: 10/24/2018 05:33 am by yoichi »

Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #310 on: 10/24/2018 06:42 am »
Descent confirmed by the simulator. ;-)



Detailed schedule of the mission is now online: http://www.hayabusa2.jaxa.jp/en/topics/20181024e_TD1-R3_Schedule/
This time it won't be just a "almost-touch & go", but the spacecraft will stay at 20m altitude for around 20 minutes, from 02:30 to 02:50 UTC.



« Last Edit: 10/24/2018 06:54 am by mcgyver »

Offline yoichi

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #311 on: 10/24/2018 07:20 am »

Offline eeergo

-DaviD-

Offline yoichi

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Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #314 on: 10/24/2018 12:47 pm »
At 20m altitude we will have these sizes in pixel for various objects (within brackets the altitude of initial visibility as 1 pixel and the possible time of happening):


ONC-W camera:
MASCOT: 15 (300m - 01:45 UTC)
MINERVA: 9 (150m - 02:20 UTC)
Target marker: 5



ONC-T camera:
MASCOT: 150  (3000m - 18:45 UTC )
MINERVA: 93 (1500m 22:40 UTC)
Target marker:  51
« Last Edit: 10/24/2018 01:38 pm by mcgyver »

Offline eeergo

Re: JAXA Hayabusa2 Mission : General Thread
« Reply #315 on: 10/24/2018 12:53 pm »
Under 10 km.

Under 6 km about 3 hours later.
« Last Edit: 10/24/2018 01:27 pm by eeergo »
-DaviD-

Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #316 on: 10/24/2018 01:29 pm »
My "extended and recalculated schedule" (not double checked... let's hope math is ok...):



24/10 14:00: 5000m, slow down to 10 cm/s
24/10 18:50: 3000m, MASCOT visibility in ONC-T
24/10 22:37: 1500m, MINERVA visibility in ONC-T
25/10 01:20: 500m
25/10 02:02: 300 m, MASCOT visibility in ONC-W
25/10 02:00: 250m
25/10 02:22: 150m, MINERVA visibility in ONC-W
25/10 02:30: Lowest altitude: 20m; hovering for 20 minutes
25/10 02:50: Ascent starts at 50 cm/s

25/10 02:53: 100m, target marker visibility loss in ONC-W
25/10 02:54: 150m, MINERVA visibility loss in ONC-W
25/10 02:59: 300 m, MASCOT visibility loss in ONC-W
25/10 03:20: 900m
25/10 03:22: 1000m, target marker visibility loss in ONC-T
25/10 03:39: 1500m, MINERVA visibility loss in ONC-T
25/10 04:10: 2600m
25/10 04:29: 3000m, MASCOT visibility loss in ONC-T


MASCOT visibility window:
ONC-T: 24/10 18:50  - 25/10 04:29 (9h29m)
ONC-W: 25/10 02:02 - 25/10 02:59 (57m)

MINERVA visibility window:
ONC-T: 24/10 22:37 - 25/10 03:39   (5h2m)
ONC-W: 25/10 02:22 - 25/10 02:54 (32m)


Target marker visibility window:
ONC-T: 25/10 02:50 - 25/10 03:22 (32m)
ONC-W: 25/10 02:50 - 25/10 02:53 (3m)



Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #317 on: 10/24/2018 02:34 pm »
Sucessfully slowed down to 0.1m/s from initial 0.4 m/s, although at 4500m rather than 5000m.

Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #318 on: 10/24/2018 02:37 pm »
It depends on difference between "HP Altitude" (distance from CoG) and "Near-Point Altitude" (altitude from ground),which is of course half the diameter of Ryugu, i.e. 450m.
LIDAR is now reading around 4500m, so slowing down was expected at 5000HPA/4500NPA.
« Last Edit: 10/24/2018 02:39 pm by mcgyver »

Offline mcgyver

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Re: JAXA Hayabusa2 Mission : General Thread
« Reply #319 on: 10/24/2018 07:41 pm »
From press release:


Upside down:



Descent realtime images:
http://www.hayabusa2.jaxa.jp/en/galleries/onc/nav20181024
« Last Edit: 10/24/2018 07:52 pm by mcgyver »

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