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Mission: Hayabusa 2
mcmcmc
post Jun 12 2018, 06:40 PM
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This is the BIGGESTof the rovers/landers, MASCOT.
Minerva-II rover B is half this size, Minerva-II rovers A1 and A2 are quarter this size!!

https://www.youtube.com/watch?v=DbLmmvki_Bo
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pandaneko
post Jun 13 2018, 01:21 AM
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On Hayabusa 2 main web page the flight path is horizontally exergerated 10 times for emphasis. There is a caption to that effect
on the same diagram.

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pandaneko
post Jun 13 2018, 06:23 AM
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Why is it that flight path segments are not straight?

P
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mcmcmc
post Jun 13 2018, 06:53 AM
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QUOTE
We're now less than 1000km from Ryugu! The asteroid is so close, we've had to change our website header so you can see the approach trajectory: the horizontal scale is now 10 x larger than the vertical scale.

https://twitter.com/haya2e_jaxa/status/1006669149832077312
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centsworth_II
post Jun 13 2018, 07:43 AM
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QUOTE (pandaneko @ Jun 13 2018, 02:23 AM) *
Why is it that flight path segments are not straight?
Flight path corrections? (Oh, if you are referring to the arch shape of the sections, given the complexities of orbital dynamics which I understand not at all, I'm surprised they are not some wierd corkscrew shape!)
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pandaneko
post Jun 13 2018, 09:45 AM
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What follows are the minor points I discovered on Hayabusa 2 Fact sheet of April

1. Chemical thrusters:
From lessons learnt from the failure with Akatsuki and Hayabusa piping system has been improved

2. Target marker is now 5 instead of 3 with Hayabusa. The idea of non-bouncing target markers comes from traditional Japanese toy
for girls called "Otedama". See still photos and a short movie. Edible beans are contained in these cloth wrapped objects.

https://goo.gl/XzawBr still pictures

https://www.youtube.com/watch?v=RHDwIL6CAIc short movie


3. Stay length: 18 months instead of 3 months with Hayabusa.

4. Samplings: 2 from surface and 1 from impact site

5. LIDAR: Not just a range finder, also finds topology, gravity, albido(spelling uncertain), range is 30m to 25km

6. ONC-W2 (donation camera) has the same specs as ONC-W1, 1mm/pix at 1m height

7. Rare gas sampling: Metal seal method so that rare gas can be brought back.

8. Sample containers: increased to three from two on Hayabusa

9. Sampling horn has an acute angle ring shaped gutter piece all around the opening so that 1-5mm grains can be accomodated
on touch down. Sudden stop in upward motion may move them into sample containers.

10. DCAM: Low resolution but real time analogue camera and high resolutioon digital camera. They are completely seperate systems
on DCAM. Battery life is 3 hours and comms. range is 10km.

11. Simultaneous interferrometric measurements of Hayabusa 2 position

Japan-Goldstone (east-west) and Japan-Cambbera (north-south) as the base lines greatly contributed to the co-ordinate accuracy
of Hayabusa 2

P

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pandaneko
post Jun 13 2018, 10:36 AM
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They have changed the display appearance of the flight path on Hayabusa 2 main page to suit the actual display in their control room.

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mcmcmc
post Jun 13 2018, 12:34 PM
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After examining source code of JAXA page, I found this raw data file about Hayabusa position:
http://www.hayabusa2.jaxa.jp/hy2sc2/data/hy2_trj.txt

I don't know if "data before today" are real recorded data, or if all of these data are just simulated...

Also found these data for Ryugu, in case anyone is interested:
HY2TRJ.Storage.Ryugu = new Orb.Kepler({
"gm": 2.9591220828559093*Math.pow(10,-4),
"argument_of_periapsis":211.4366,
"eccentricity":0.1902973,
"epoch":2458200.5,
"inclination":5.88397,
"longitude_of_ascending_node":251.58914,
"mean_anomaly":305.97003,
"semi_major_axis":1.1895874

It would be interesting to check if both data groups will be updated in next days.
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pandaneko
post Jun 13 2018, 11:52 PM
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By the look of it next straight ahead is at around 600km when Hayabusa 2 becomes tangential to its planned
flight path. I am running out of my popcorn...

P

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Marcin600
post Jun 14 2018, 03:05 AM
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From press conference
Attached File  2.bmp ( 2.1MB ) Number of downloads: 123
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Marcin600
post Jun 14 2018, 03:12 AM
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Marcin600
post Jun 14 2018, 03:40 AM
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Ryugu seems quite similar to the anticipated shape model.
If the Sun was right behind the ship, it seems that there is a brighter area on the right and a darker one on the left. But these can be artifacts
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mcmcmc
post Jun 14 2018, 07:34 AM
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New press conference held yesterday.
https://www.youtube.com/watch?v=S9nw3bli_Io&t=33s


Presentation in Japanese, lot of veryu interesting info! (Probably English version is coming soon)
http://fanfun.jaxa.jp/jaxatv/files/20180614_hayabusa2.pdf





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MahFL
post Jun 14 2018, 08:41 AM
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QUOTE (mcmcmc @ Jun 14 2018, 07:34 AM) *
New press conference held yesterday.
https://www.youtube.com/watch?v=S9nw3bli_Io&t=33s


Presentation in Japanese, lot of veryu interesting info! (Probably English version is coming soon)
http://fanfun.jaxa.jp/jaxatv/files/20180614_hayabusa2.pdf


Google Translate seems to do a good job translating each slide.
One slide says the image of the asteroid is now 10 pixels across, was 3.
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mcmcmc
post Jun 14 2018, 08:49 AM
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QUOTE (MahFL @ Jun 14 2018, 09:41 AM) *
Google Translate seems to do a good job translating each slide.
One slide says the image of the asteroid is now 10 pixels across, was 3.

Last time I spent hours in copying each slide in google and translating... then the day after they issued the english version.
So I'll wait. :-)
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