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Hayabusa - The Return To Earth, The voyage home
odave
post Nov 28 2005, 03:08 PM
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...starting a new thread for Hayabusa's sampling feedback and the return voyage.

After its nail-biting success in November, will there be enough fuel for the Falcon to make it home?


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odave
post Dec 8 2005, 04:01 PM
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Lots of good info in those new translations - the volunteer work is much appreciated! For those who haven't read it yet, there is some hope for getting some kind of sample back:

QUOTE
Asahi: What do you think of the possibility that the sample were stirred up by the landing and actually gathered? [...]

Kawaguchi: Escape velocity from Itokawa is equivalent to the speed of a pencil dropped from 0.5 millimeter height. It would only bounce up 0.5mm on earth, but on Itokawa where the gravity is small it would jump up more than 10 meters. Buton the second touchdown, the vehicle actually touched the ground for only a second and ascended back, so the sampler horn ascended with the sample, thus the sample would not have reached the capsule. In the touchdown on 20th the vehicle landed on the surface for substantially long time, so we think it is highly probable that the sample that were stirred up have entered the capsule.


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ljk4-1
post Dec 9 2005, 05:08 PM
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Status of the Hayabusa

December 7, 2005

Japan Aerospace Exploration Agency


As has been reported, it is estimated that part of a series of
attitude and orbit control commands to restore the Hayabusa from its
safe-hold mode have not gone well, and the functions of its major
systems, including its attitude and communication network, have
significantly deteriorated. However, on Nov. 29, a beacon line through
a low gain antenna was restored.

On Nov. 30, we started a restoration operation by turning on and off
the radio frequency modulation through the autonomous diagnostic
function. Subsequently, on Dec. 1, telemetry data were acquired at 8
bits per second through the low gain antenna, although the line was
weak and often disconnected. According to the data transmitted so far,
the attitude and orbit control commands sent on Nov. 27 did not work
well due to an unknown reason, and either major attitude control
trouble or a large electric power loss seems to have occurred. It is
estimated that the overall power switching systems for many pieces of
onboard equipment were reset as their temperature dropped
substantially due to the evaporation of leaked propellant, and also
because of a serious discharge of electricity from the batteries of
many sets of onboard equipment and systems due to declining power
generation. Details are still under analysis.

On Dec. 2, we tried to restart the chemical engine, but, even though
a small thrust was confirmed, we were not able to restore full-scale
operations. Consequently, the cause of the anomaly on Nov 27 is still
under investigation, and we suspect that one of the causes could be
the malfunction of the chemical engine.

On Dec. 3, we found that the angles between the axis of the onboard
high gain antenna (+Z angle) and the Sun, and also that with the earth,
had increased to 20 to 30 degrees. As an emergency attitude control
method, we decided to adopt a method of jetting out xenon for the ion
engine operation. Accordingly, we immediately started to create the
necessary operation software. As we completed the software on Dec. 4,
we changed the spin speed by xenon jet, and its function was confirmed.
Without delay, we sent an attitude change command through this
function.

As a result, on Dec. 5, the angle between the +Z axis and the sun, and
the earth, recovered to 10 to 20 degrees, and the telemetry data
reception and acquisition speed was restored to the maximum 256 bits
per second through the mid gain antenna.

After that, we found that there was a high possibility that the
projectile (bullet) for sampling had not been discharged on Nov. 26,
as we finally acquired a record of the pyrotechnics control device
for projectile discharging from which we were not able to confirm
data showing a successful discharge. However, it may be because of the
impact of the system power reset; therefore, we are now analyzing the
details including the confirmation of the sequence before and after
the landing on Nov. 26.

As of Dec. 6, the distance between the Hayabusa and the Itokawa is
about 550 kilometers, and that from the earth is about 290 million
kilometers. The explorer is relatively moving from the Itokawa toward
the earth at about 5 kilometers per hour.

We are now engaging in turning on, testing, and verifying onboard
equipment of the Hayabusa one by one to start the ion engine. We
currently plan to shift the attitude control to one using the Z-axis
reaction wheel, and restart the ion engine. The restart is expected to
happen no earlier than the 14th. We are currently rescheduling the
plan for the return trip to earth. We need to study how to relax the
engine operation efficiency. We will do our utmost to solve the
problem with the attitude control (such as the restoration of the
chemical engine), then find a solution for the return trip.

Since Nov. 29, our reports have been limited due to difficulties in
confirming telemetry data. We apologize for any inconvenience.
We will inform you as soon as the ion engine is restarted.


This page URL:

http://www.jaxa.jp/press/2005/12/20051207_hayabusa_e.html

---------------------------------------------------------------------

Publisher : Public Affairs Department
Japan Aerospace Exploration Agency (JAXA)
Marunouchi Kitaguchi Building,
1-6-5, Marunouchi, Chiyoda-ku, Tokyo 100-8260
Japan
TEL:+81-3-6266-6400

JAXA WEB SITE :

http://www.jaxa.jp/index_e.html


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and coarse. But the longest intercourse with Nature, though in her rudest moods, does
not thus harden and make coarse. A hard, sensible man whom we liken to a rock is
indeed much harder than a rock. From hard, coarse, insensible men with whom I have
no sympathy, I go to commune with the rocks, whose hearts are comparatively soft."

- Henry David Thoreau, November 15, 1853

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Posts in this topic
- odave   Hayabusa - The Return To Earth   Nov 28 2005, 03:08 PM
- - ElkGroveDan   QUOTE (odave @ Nov 28 2005, 03:08 PM)...start...   Nov 28 2005, 03:16 PM
- - RNeuhaus   Recent News from Matsuura Newspaper 2005.11.28 ...   Nov 28 2005, 09:56 PM
|- - ElkGroveDan   QUOTE (RNeuhaus @ Nov 28 2005, 09:56 PM)This ...   Nov 28 2005, 10:09 PM
- - RNeuhaus   According to the article of the space.com. By Dece...   Nov 28 2005, 10:18 PM
- - mike   It would certainly be interesting if Hayabusa foll...   Nov 28 2005, 10:38 PM
- - Joffan   I'm not sure that sitting in Itokawa's sha...   Nov 29 2005, 01:06 AM
- - mike   Yeah, I remembered the solar panels need some sola...   Nov 29 2005, 02:16 AM
- - Ishigame   I would tell you some bad news… JAXA says Hayabusa...   Nov 29 2005, 08:04 AM
|- - odave   Good translation! Worrying news, though. The...   Nov 29 2005, 03:40 PM
|- - hugh   QUOTE (odave @ Nov 29 2005, 03:40 PM)Kawaguch...   Nov 30 2005, 12:40 PM
- - nop   Sorry for multi-posting. If your friends are work...   Nov 29 2005, 04:51 PM
- - odave   QUOTE (ljk4-1 @ Nov 29 2005, 01:44 PM fr...   Nov 29 2005, 07:03 PM
- - Orlin Denkov   QUOTE Probe returning to Earth after asteroid land...   Nov 29 2005, 10:41 PM
- - TheChemist   Probably not good things There are two press r...   Nov 29 2005, 11:09 PM
- - nop   Dear 5thstar (if you read this forum), ljk4-1, oda...   Nov 30 2005, 03:16 AM
|- - RNeuhaus   QUOTE (nop @ Nov 29 2005, 10:16 PM)Dear 5thst...   Nov 30 2005, 04:00 AM
- - deglr6328   Grist for the Moomaw mill ... This from the Nat...   Dec 1 2005, 12:04 AM
- - BruceMoomaw   Oh dear, oh dear, oh dear. Pride goeth before a l...   Dec 1 2005, 12:35 AM
|- - helvick   Nice detailed update from Emily over at The Planet...   Dec 1 2005, 12:48 AM
- - RNeuhaus   Dramatic news extracted from Planetary.org: At t...   Dec 1 2005, 02:24 AM
- - mike   If Hayabusa's thrusters persist in being only ...   Dec 1 2005, 04:18 AM
|- - ElkGroveDan   QUOTE (mike @ Dec 1 2005, 04:18 AM)If Hayabus...   Dec 1 2005, 05:40 AM
||- - ljk4-1   Would it be possible to send out a probe to snag H...   Dec 2 2005, 07:53 PM
|- - Bob Shaw   QUOTE (mike @ Dec 1 2005, 05:18 AM)If Hayabus...   Dec 2 2005, 08:34 PM
- - RNeuhaus   There many options. Wait for a while until before ...   Dec 2 2005, 08:31 PM
|- - Bob Shaw   QUOTE (RNeuhaus @ Dec 2 2005, 09:31 PM)There ...   Dec 2 2005, 08:45 PM
- - odave   5thstar's blog has a few new Hayabusa updates....   Dec 3 2005, 02:06 PM
|- - RogueEngineer   QUOTE (odave @ Dec 3 2005, 11:06 PM)Hopefully...   Dec 7 2005, 12:58 PM
- - BruceMoomaw   Are they actually saying that they themselves acci...   Dec 7 2005, 02:07 PM
- - RNeuhaus   December 7, 2005 05:42 PM According to the L/D of...   Dec 7 2005, 02:31 PM
- - nop   More translations have been added on the comment a...   Dec 8 2005, 12:29 AM
- - Harder   The Dec 8 update of the Y.M. Column is now online....   Dec 8 2005, 01:35 PM
|- - odave   From the above: QUOTE During its operation Dr. Ku...   Dec 8 2005, 02:48 PM
|- - tedstryk   QUOTE (odave @ Dec 8 2005, 02:48 PM)From the ...   Dec 8 2005, 03:36 PM
|- - odave   QUOTE (tedstryk @ Dec 8 2005, 10:36 AM)I have...   Dec 8 2005, 03:46 PM
- - odave   Lots of good info in those new translations - the ...   Dec 8 2005, 04:01 PM
|- - ljk4-1   Status of the Hayabusa ...   Dec 9 2005, 05:08 PM
- - RNeuhaus   Hope that Hayabusa has a match fire on their side ...   Dec 9 2005, 05:17 PM
|- - The Messenger   Since the xenon was not intended to be used as an ...   Dec 9 2005, 07:11 PM
|- - ljk4-1   FATE OF JAPAN'S TROUBLED ASTEROID PROBE UNCERT...   Dec 12 2005, 08:03 PM
|- - odave   QUOTE (The Messenger @ Dec 9 2005, 02:11 PM)S...   Dec 12 2005, 08:35 PM
- - amezz   Press Conference about Hayabusa present status, wi...   Dec 13 2005, 05:49 PM
- - elakdawalla   Just added this to my blog, I thought I'd add ...   Dec 13 2005, 11:44 PM
- - BruceMoomaw   I very much doubt it will be around by then, and I...   Dec 14 2005, 02:33 AM
|- - ljk4-1   So - would another nation be willing and able to r...   Dec 14 2005, 02:38 AM
||- - amezz   QUOTE (ljk4-1 @ Dec 14 2005, 06:38 AM)If...   Dec 14 2005, 10:46 AM
||- - ljk4-1   *** JAXA MAIL SERVICE *** Japa...   Dec 14 2005, 12:17 PM
||- - Bob Shaw   QUOTE (amezz @ Dec 14 2005, 11:46 AM)Yes...   Dec 17 2005, 01:54 PM
||- - MahFL   "Except for the return element, Hayabusa has ...   Dec 17 2005, 08:11 PM
|- - lyford   QUOTE (BruceMoomaw @ Dec 13 2005, 06:33 PM)I ...   Dec 14 2005, 03:17 AM
- - elakdawalla   Shin-ya Matsuura's transcript is up in Japanes...   Dec 14 2005, 02:40 AM
- - elakdawalla   A cooperative translation project is taking place ...   Dec 14 2005, 03:47 AM
- - lyford   QUOTE If the ion engines are ignited again by the ...   Dec 14 2005, 04:47 AM
- - lyford   From the translation: At first when I read the int...   Dec 14 2005, 05:50 AM
- - nop   English version of JAXA press release: http://www....   Dec 14 2005, 12:18 PM
|- - abalone   QUOTE (nop @ Dec 14 2005, 11:18 PM)Guys, wait...   Dec 14 2005, 12:28 PM
- - djellison   All sounds a little bit Nozomi-ish really I just...   Dec 14 2005, 12:45 PM
|- - ljk4-1   QUOTE (djellison @ Dec 14 2005, 07:45 AM)All ...   Dec 14 2005, 05:11 PM
|- - nop   QUOTE (ljk4-1 @ Dec 15 2005, 02:11 AM)Sp...   Dec 14 2005, 05:42 PM
|- - ljk4-1   QUOTE (nop @ Dec 14 2005, 12:42 PM)Nozomi is ...   Dec 14 2005, 06:09 PM
- - djellison   It'd be cheaper, and the results would be bett...   Dec 14 2005, 06:16 PM
|- - ljk4-1   QUOTE (djellison @ Dec 14 2005, 01:16 PM)It...   Dec 14 2005, 07:11 PM
|- - djellison   QUOTE (ljk4-1 @ Dec 14 2005, 07:11 PM)So...   Dec 14 2005, 08:30 PM
|- - ljk4-1   Science/Astronomy: * Asteroid Probe Yields Insigh...   Dec 14 2005, 08:42 PM
|- - ljk4-1   QUOTE (djellison @ Dec 14 2005, 03:30 PM)Some...   Dec 16 2005, 04:16 PM
- - RNeuhaus   Indeed yes, but we are still with diaper in space ...   Dec 14 2005, 06:25 PM
- - RNeuhaus   Example for Hayabusa return starting in June 2007 ...   Dec 16 2005, 04:01 PM
|- - nop   QUOTE (RNeuhaus @ Dec 17 2005, 01:01 AM)The q...   Dec 16 2005, 05:28 PM
- - Phil Stooke   ljk4-1 : "QUOTE(djellison @ Dec 14 2005...   Dec 16 2005, 06:42 PM
|- - ljk4-1   QUOTE (Phil Stooke @ Dec 16 2005, 01:42 PM)lj...   Dec 16 2005, 06:48 PM
- - edstrick   The Hayabusa orbits plot is in sun-earth-fixed ROT...   Dec 17 2005, 05:44 AM
- - deglr6328   Heathens! How dare you try to explain away Hay...   Dec 17 2005, 08:52 AM
|- - lyford   QUOTE (deglr6328 @ Dec 17 2005, 12:52 AM)Heat...   Dec 19 2005, 07:02 AM
- - BruceMoomaw   Well, it did everything NEAR did on only about 2/3...   Dec 17 2005, 09:18 PM
|- - Bob Shaw   QUOTE (BruceMoomaw @ Dec 17 2005, 10:18 PM)We...   Dec 17 2005, 10:04 PM
|- - Holder of the Two Leashes   QUOTE (BruceMoomaw @ Dec 17 2005, 03:18 PM)We...   Dec 18 2005, 02:05 AM
||- - hugh   QUOTE (Holder of the Two Leashes @ Dec 18 200...   Dec 19 2005, 12:30 AM
|- - tedstryk   QUOTE (BruceMoomaw @ Dec 17 2005, 09:18 PM)We...   Dec 18 2005, 04:11 AM
|- - odave   And also remember that this is primarily an engine...   Dec 18 2005, 08:13 PM
- - BruceMoomaw   Let me amend: ALMOST everything. (Its best photos...   Dec 18 2005, 03:11 AM
- - edstrick   Hayabusa returned a huge amount of infrared spectr...   Dec 19 2005, 07:00 AM
|- - Holder of the Two Leashes   QUOTE (edstrick @ Dec 19 2005, 01:00 AM)Hayab...   Dec 19 2005, 05:32 PM
|- - tedstryk   QUOTE (Holder of the Two Leashes @ Dec 19 200...   Dec 20 2005, 05:34 AM
- - The Messenger   Does anyone have any insight into why reaction whe...   Dec 19 2005, 03:33 PM
- - Phil Stooke   Even if Hayabusa only returned a quarter of NEAR...   Dec 19 2005, 07:19 PM
|- - ljk4-1   Would it have been easier to have Hayabusa touch d...   Dec 19 2005, 07:43 PM
- - edstrick   Holder of the Two Leashes: "The reason it ...   Dec 19 2005, 07:38 PM
|- - Holder of the Two Leashes   QUOTE (edstrick @ Dec 19 2005, 01:38 PM)I not...   Dec 19 2005, 08:54 PM
- - RNeuhaus   Minerva would do much better the job with imaging ...   Dec 19 2005, 07:51 PM
- - Joffan   QUOTE (Holder of the Two Leashes @ Dec 19 200...   Dec 19 2005, 10:31 PM
|- - Holder of the Two Leashes   QUOTE (Joffan @ Dec 19 2005, 04:31 PM)I thoug...   Dec 19 2005, 11:45 PM
- - lyford   And NEAR never found a Red Light District, either....   Dec 20 2005, 02:43 AM
- - edstrick   Holder of the Two Leashes: "...One other th...   Dec 20 2005, 09:31 AM
|- - JRehling   Both missions were successful. Note that they were...   Dec 20 2005, 04:43 PM
|- - Holder of the Two Leashes   QUOTE (edstrick @ Dec 20 2005, 03:31 AM)I gue...   Dec 20 2005, 07:29 PM
|- - The Messenger   QUOTE (edstrick @ Dec 20 2005, 02:31 AM)Where...   Dec 21 2005, 02:34 PM
- - BruceMoomaw   Hawaii's Jeffrey Bell has been telling me for ...   Dec 20 2005, 10:12 PM
- - Phil Stooke   I just noticed this, though it may not be brand ne...   Dec 30 2005, 06:32 PM
- - ljk4-1   Maybe if we wait a few million years, we'll ge...   Jan 3 2006, 05:11 PM
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