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Mission: Hayabusa 2
Phil Stooke
post Today, 03:38 AM
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It is possible that the window will show a sphere (or shape model) with a latitude-longitude grid, indicating the orientation of the asteroid in the images (rather than the position of the asteroid), or when closer in, the position of the WA image on the asteroid.

Phil


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... because the Solar System ain't gonna map itself.
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pandaneko
post Today, 04:31 AM
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What follows is the translation of the pop-up caption of the display area, to the best of my ability, and as precisely
as possible.

"The position and the size of Ryugu as seen by the camera. In the vicinity of Ryugu Hayabusa will be
approaching it while capturing Ryugu's external appearance."

Position? , why should it matter?
Size?, we know it by now.

P
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mcmcmc
post Today, 06:24 AM
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Caught!

QUOTE
From now on, the asteroid's gravity will dominate the area (Hill area: within about 90 km from the asteroid) will enter!

https://twitter.com/haya2_jaxa/status/1009368813429592064
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pandaneko
post Today, 07:16 AM
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Ryugu like thing is now seen in the window we have been talking about!

P


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mcmcmc
post Today, 07:19 AM
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QUOTE (Phil Stooke @ Jun 21 2018, 03:38 AM) *
It is possible that the window will show a sphere (or shape model) with a latitude-longitude grid, indicating the orientation of the asteroid in the images (rather than the position of the asteroid), or when closer in, the position of the WA image on the asteroid.

Phil


I think this old PDF explains what is going to happen, although I can't translate it (see p.19):
http://fanfun.jaxa.jp/jaxatv/files/20180419_hayabusa2.pdf

Probably by "schematic" they mean a 3d model.

I think the box will show Hayabusa attitude w.r.t Ryugu during various operations. I whink it will look a lot like a Star Trek Enterprise screen! :-)

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pandaneko
post Today, 08:01 AM
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I think information on training will be of interest to forum members. My translation will follow for the few pages
on training as follows.

P

Page 16:

Operation training

・LSS(Landing Site Selection) training

Aim: Find out, from technically and scientifically meaningful viewpoint, if our limited resources inluding time
can actually land the mother ship and rovers onto the asteroid surface. 

・IRIO (Real-time Integrated Operation) training:

Use of simulator for landing and proximity operations in critical situation in real time to increase proficiciency
of operation members.
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pandaneko
post Today, 08:30 AM
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Page 17:

RIO training objectives:

We want to increase the operational proficiency of operating members by giving them advance trainings
in order to reduce risk and increase success probability in critical mission phase.

* Operator training for special phases such as descending towards the ground surface.
* Confirming on-site actions in nominal cases in critical operations  
* Tool operators skill increase in use of tools such as GCP-NAV
* Monitoring of contingency cases and reactions  
* Operators readiness for emergencies 
* Team integration/building by JAXA and manufacturers members 
* Verification and confirmation of ground tools

1. Interface confirmation

2. Exracting areas for further improvements in tools
GCP-NAV: Ground Control Point Navigation

3. Feedback into real operation
3.1 Identification of improvements in operation manual
3.2 Brushing up of contingency plan in navigation control and guidance

GNC: Guidance Navigation and Control

P
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pandaneko
post Today, 09:02 AM
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Page 18

Types of RIO training

A: TRIO(RIO training dry run inside JAXA
Franework/contents/date of training

* Dry-run 1 (10 times)/

Training within JAXA by making use of hardware simulator(HIL)verification procedures/ January to June 2017

* Dry-run 2 (10 times)/

Training within JAXA by making use of image feedback functions with image generator/ July 2017- May 2018

B: RIO (actual realtime training)

Franework/contents/date of training

Session 1: October to December 2017
Session 2: January to May 2018

* Small scale training (3 times)
Training for GNC related tools in critical operation

* Middle scale training (11 times)
Training for specific imaginary cases in critical operation

* Large scale training (9 times)
24 hour non-stop operation for all major phases in descending operation

Total number of training sessions 43. Further 4 trainings are planned before May 2018 (total: 47 training
sessions)

P
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pandaneko
post Today, 09:30 AM
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Having translated this document so far I am no longer sure exactly what they are doing.

What I can say for sure is that page 19 is dedicated to computer generated imaginary Ryugu pictures called
Ryugoroid.

Page 20 is a complicated chart and I am not going to spend time on translating it, but I will come to that
in a moment after what follows. This is the translation of page 21, most notable statment on that page.

Page 21:

GCP-NAV:

Feedback control from the ground station using generated images.

Pre-genarated asteroid model (database of outer shape and specific points) is compared/matched with
the real images from Hayabusa, thereby estimating the position of Hayabusa to send control signals.

It seems to me that position of Hayabusa is the utmostimportance to JAXA. I do not understand it,
but back to page 20's chart. Here at the bottom right is an image generator. Frurther to the left are screens.

My current guess is that interactively generated and corrected images (owing to the real images from Hayabusa)
are fed into the screen we are watching. So, what we see on the display window may not be the real thing, but
very close to real asteroid.

What do I mean by that...?

P
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mcmcmc
post Today, 09:55 AM
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Your effort is very appreciated, but I presume we'll get the official English version of the PDF within 24 hours, as already happened 2 times.

But I can't find a page listing all the available PDFs, both in english and japanese, does it exist?
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pandaneko
post Today, 10:00 AM
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I have annotated parts of the chart on page 20, but unsure if this will go up as it may be a little large.

It represents the simulator.

In case it does, the big chunk in green dotted square is the electrical Hayabusa

The square at the bottom left contains various monitors, which includes the image monitor they are watching
and my guess is that it is the same display monitor that we can watch.

Image generator perhaps has a built-in database of the asteroid called Ryugoid, I think.

Why cannot they simply show us real images? Is it that difficult to do that?

P
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pandaneko
post Today, 10:02 AM
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I forgot to upload my annotation.

Yes, its size is just below the limit.

P


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