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PROCYON, Small satellite asteroid flyby launched with Hayabusa 2
Explorer1
post Dec 7 2014, 07:58 PM
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PROCYON is in the right trajectory too; the initial operations phase has begun.

http://www.spacedaily.com/reports/Flight_S...ROCYON_999.html
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Weywot
post Dec 9 2014, 11:01 PM
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Maybe PROCYON soon needs its own thread.
Next to the JAXA press release, already mentioned above in the spacedaily article, it also has a facebook page.

Some posts are in english, but goole translate helped me with the interesing other statements the last days, that the three-axis attitude control system was successfully tested by starting the RCS. The post is illustrated with some nice ASCII art that shows housekeeping data.

The last post shows the calibration test for the attitude control, with an initial "oversteering" of a deliberate change of 10° from the sun orientation and then as google translate says: "I was able to direct the clean attitude of goal without having to vibration as "After" in Figure!!!" smile.gif Picture here.

I think it's really nice to have such direct reports from the team and the spacecraft. I remember that from other japanese missions, like the blog from the IKAROS mission.
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elakdawalla
post Dec 9 2014, 11:05 PM
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Good idea for a separate thread for PROCYON; I've made one here.

Here's a good article on PROCYON posted today, as well as a paper mentioning some possible targets: 2000 DP107, 2010 LJ14 and 2002 AJ29. Via Twitter, radio astronomer Michael Busch says that 2000 DP107 is a binary asteroid studied extensively by radar in work led by Shantanu Naidu and Jean-Luc Margot.


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Weywot
post Dec 9 2014, 11:21 PM
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Can't even edit my post, already a new thread wink.gif

What I wanted to add:

I somehow miss the LAICA camera system in all PROCYON images and articles. It only shows in some functional block diagrams. Was the "Observation of Geocorona using Lyman Alpha Imaging CAmera" just a proposal, or is it on board the spacecraft? I wonders, since the observation time is said to be 1-2 weeks afer launch in the ppt presentation translated by pandaneko. Thanks btw.

Some other good articles about PROCYON on spaceflight101 (also about ArtSat and Shin'en2) and very extensive one on eoPortal Directory, but all are missing LAICA.
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charborob
post Dec 10 2014, 01:08 AM
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I tried searching for information about the camera carried by PROCYON, but I couldn't find anything too clear about it. What resolution does it have?
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pandaneko
post Dec 15 2014, 02:19 AM
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QUOTE (Weywot @ Dec 10 2014, 08:21 AM) *
Lyman Alpha Imaging CAmera" just a proposal, or is it on board the spacecraft?


I have been away in Taipei, paying my respect to Teresa Teng, an Asiawide famous female singer,
who died at the age of 41. I do not carry IT things (or for that matter even a camera). So,
that is for the delay in my response.

I think the camera is on. That is my gut feeling. I will start translating the gist of what the
control team is saying. By looking at what they have said to date the probe may not yet be
far out enough to look at the earth.

If the camera is installed they will have to be saying something about what our hydrogen extent
is looking like. So far, no mention of it.

I am personally more interested in asteroids. Will this probe be reaching one a lot sooner
than Hayabusa 2? P
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pandaneko
post Dec 15 2014, 06:06 AM
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PROCYON status digest from FB as follows. P

9 December

Reporting on status on 8th.

Travelling at 2.2 million km from earth, it takes 7 seconds for the signals
to reach PROCYON.

We made adjustments to the 3 axix attitude control system and
we are now able to point PROCYON in any ditrection we want, like
pointing the medium gain antenna to earth.

10 December

Almost a week from launch. PROCYON is healthy, but far away. Unless we communicate slowly line is
corrupted by noise. Comms. rate has been 2kbps, from PROCYON.

Today's testing was on the medium gain antenna. We made it and are now able to use
16kbps, still as slow as 1/1000 of smart phone comms.

Yesterday


PROCYON operation stopped during 12-14 December. During this period PROCYON passed through
a region of very strong solar winds. You can get information on solar winds on

http://www.swpc.noaa.gov/products/wsa-enli...wind-prediction

PROCYON is currently at 4 million km from earth.

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Weywot
post Dec 15 2014, 05:05 PM
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QUOTE (pandaneko @ Dec 15 2014, 03:19 AM) *
Will this probe be reaching one a lot sooner than Hayabusa 2?


As Hayabusa2's arrival at 1999 JU3 is planned for June 2018, PROCYON will make its fly by earlier. In the above mentioned paper by Ozaki et al., all possible target asteroids will be reached mid to end of 2016.
The paper was written prior to the launch and as the launch day was not clear, the target asteroid was not selected. Table nr. 4 on page 9 of the paper lists some of the target astroids, of which all require an earth gravity assist. The ones that can be reached directly in a shorter time result in a too short phase of only about one day where the probe can steer by optical navigation. This time sould be more than 3 days, which is only possible for the asteroids reached by the gavity assist scenario.

So we will know the exact fly by date, when the asteroid will be selected and announced by JAXA.
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katodomo
post Apr 8 2015, 04:49 PM
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If I get that right in this Japanese article 2000 DP 107 has been offically announced as the primary candidate target asteroid:

http://senews.jp/satellite/2015/04/07/528
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Explorer1
post Apr 8 2015, 05:33 PM
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Two for the price of one, nice! Short rotation rate on the primary too; it should be possible to see the whole area during the flyby?
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Paolo
post Apr 9 2015, 04:17 PM
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everything you wanted to know about PROCYON's target: Radar Imaging and Characterization of Binary Near-Earth Asteroid (185851) 2000 DP107
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pandaneko
post Apr 10 2015, 11:29 AM
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I have been looking at PROCYON's FB, at least once/week to see what is going on.

I must say I am very unhappy. Only today I learnt through my GOOGLE alert that
JAXA and Tokyo University had a joint press meeting on 6 April to say that
the engine had stopped running.

No mention of when the engine stopped. Does anybody know anything?

No wonder no progress report in their FB. P
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PaulH51
post Apr 10 2015, 12:09 PM
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QUOTE (pandaneko @ Apr 10 2015, 07:29 PM) *
....JAXA and Tokyo University had a joint press meeting on 6 April to say that the engine had stopped running.

Let's hope they can solve the issues and restart the engine ASAP


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Paolo
post Apr 10 2015, 12:15 PM
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the link that katodomo posted above says engine stopped in mid-March after 223 hours in total. they expect (hope for?) recovery by end of April
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Paolo
post Apr 10 2015, 03:02 PM
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from this image of the press event, flyby would be on 12 May 2016
http://image.itmedia.co.jp/mn/articles/150...hi_P1300584.jpg
there is also a short article here, but with little or no new informations


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