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akibow
Posted on: Jun 28 2010, 08:51 AM


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You might see a bulletin board here about the sample analysis relation.

Hayabusa Post-Landing & Science Results
http://www.unmannedspaceflight.com/index.p...15&start=15
  Forum: Cometary and Asteroid Missions · Post Preview: #161551 · Replies: 702 · Views: 655474

akibow
Posted on: Jun 28 2010, 04:58 AM


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QUOTE (Hungry4info @ Jun 25 2010, 04:10 AM) *
Physorg is reporting that Japan has found a trace gas in the capsule.
http://www.physorg.com/news196593989.html

Anyone know anything more official?


The press conference was held in the curation facility of JAXA on June 24.
from blog of Shinya Matsuura , Summary and translate by akibow.

June 18th : checked all capsule and separated sample container by CT.
There was a question that "Yesterday, there was a report that there is no sample larger than 1mm. Is it true?"
They announced that:
The purpose is to check the damage of the capsule sealing, and sealing is OK.
1mm-sliced CT was done , and sample is not detected.
But it doesn't mean there is no 1mm-sized sample.
CT check is optimized for O-ring and sample tube structure check, not for internal sample check.
We have data that the grain of 3-5mm or more can be detected if it is a silicate.
It is understood that there is no such size sample.

June 22th: measured pressure in the capsule
After the atmospheric pressure in the inside and outside of the capsule had been arranged, the gas in the capsule was gathered.
The element of the gas has not been understood yet.
It may be from itokawa, may be from atmosphere of earth.
Sealing is worked correctly.
Result of gas analysis will come out with announce of initial analysis.

June 24th:started sample container opening
Opening hatch is scheduled in July.(press release says it tooks one week.)
The person in charge is explaining as follows.
------------
Because it is only one sample, I want to do steadily.
For instance, the wire of the loose stop of the bolt is removed when loosening a bolt and removing, and the bolt is turned. Because there is a possibility that the sample adheres also in the bolt and the loose stop wire, numbering is done after everything is collected and it keeps it. Only removing the screw takes considerable time.
------------

After opening, they search for particles by microscope.
They can pickup 5 or 10 micrometer sized particle.
All parts of capsule is stored.
In the future, it is possible to handle 1 micrometer sized particle

Five men of curation facility and and three men of researcher is working for examination of capsule.
The researcher of NASA is attending work, and the monitor and advice are done.
  Forum: Cometary and Asteroid Missions · Post Preview: #161547 · Replies: 702 · Views: 655474

akibow
Posted on: Jun 8 2010, 07:38 AM


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http://www.isas.jaxa.jp/home/IKAROS-blog/?itemid=551
---- summary ---
Japan Aerospace Exploration Agency (JAXA) will execute the third day of first developnent and the second development.

June 8th evening-midnight (JST) : 3rd day of 1st development + 2nd development
June 9th evening-midnight (JST) : confirm development

second development is full expansion of sail.
http://www.youtube.com/watch?v=7Mb47w0vB04...feature=related
  Forum: Private Missions · Post Preview: #160742 · Replies: 162 · Views: 202260

akibow
Posted on: Jun 7 2010, 07:11 AM


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QUOTE (nprev @ Jun 6 2010, 11:18 AM) *
Okay, so if I did that right that's 13 Jun 1200-1400 GMT?

Hope there's some TV coverage. Haven't heard if NASA TV here in the US is gonna do anything; might have to rely on the good graces of CNN International.


It seems that JAXA relays the control room situation when the explorer returns.
http://www.isas.jaxa.jp/j/topics/topics/2010/0526.shtml
JAXA recruits the entrepreneur who delivers "HAYABUSA" control room relay image.
(June 13th, 1800-2400 JST(13 Jun 0900-1500 UT, movie only, no voice. )

When HAYABUSA touch down on ITOKAWA asteroids, JAXA offered the control room image movie.
And as you know, when landing, JAXA passed on information with HAYABUSA-blog by Japanese and English.
http://www.isas.jaxa.jp/home/hayabusa-live...10&blogid=6

I think these two sources is useful getting realtime information for retun of HAYABUSA.

"NIKO-NIKO DOUGA" broadcast the return of HAYABUSA.
http://live.nicovideo.jp/gate/lv18265557

  Forum: Cometary and Asteroid Missions · Post Preview: #160714 · Replies: 702 · Views: 655474

akibow
Posted on: Jun 7 2010, 05:37 AM


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http://www.isas.jaxa.jp/home/IKAROS-blog/?itemid=550

---translated by akibow---
TODAY'S IKAROS (6th,June)

IKAROS stands by with maintaing first development, length=5m or more.
Under this condition, the spin rate is increasing very slowly.
This is anxious for the developer of IKAROS , though is not an amount that becomes a problem.
it is the one about which it is anxious in a small symptom though it is not an amount that actually becomes a problem on because it is very slow.
The cause is not specified yet.
Many reasons are thought.
For instance, it is accelerated the rotation by the sunlight pressure like the pinwheel,
or an influence of the out gas or might be the one more by another factor.

We obsere this phenomenon by using this standby time. (Y)

6/6 IKAROS
Distance of the sun:1.04AU
Distance of the earth: 6,342,032km and right ascension =- 157.8° and celestial declinations =- 23.0°
Distance of Venus: 1.25AU
Posture: 7.4 rpm and spin rate = sun corner 15.0deg
  Forum: Private Missions · Post Preview: #160713 · Replies: 162 · Views: 202260

akibow
Posted on: Jun 6 2010, 11:41 PM


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related article.
http://www.planetary.org/blog/article/00002527/
  Forum: Private Missions · Post Preview: #160702 · Replies: 162 · Views: 202260

akibow
Posted on: Jun 6 2010, 02:28 PM


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http://www.isas.jaxa.jp/home/IKAROS-blog/?itemid=549
----from IKAROS blog (japanese) , translated by akibow-----
Japan Aerospace Exploration Agency (JAXA) operated IKAROS (launched from Tanegashima Space Center on May 21, 2010(JST) until last night, and normally ended the second day of first-step of sale development.

However, there were some differences between the flight result and the simulation about development.
For more careful second development, we decided to examine the numerical value closely.

Therefore, the third day of first development and the second development is scheduled after Tuesday, June 8(JST).
We will announce schedule of the third day of first development and the second development as soon as we decides it.

The state of the explorer is excellent.

http://twitter.com/ikaroskun
----from IKAROS twitter (japanese) , translated by akibow-----
I'm telling many information to USUDA antenna.
They say that my movement is different from the simuration in pre-launch.
I am safe and energetic though movement seems to be different.
  Forum: Private Missions · Post Preview: #160676 · Replies: 162 · Views: 202260

akibow
Posted on: Jun 5 2010, 09:28 AM


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Now(6/5 0:54 JST) IKAROS is drawing out the sail by the centrifugal force.
The sail is still bundled.
Please refer to the animation below URL.
The bundled sail has been extended to the opening drawing out passing about 10m.
It is a state of about 35 seconds of this animation now.
http://www.youtube.com/watch?v=7Mb47w0vB04...feature=related
  Forum: Private Missions · Post Preview: #160629 · Replies: 162 · Views: 202260

akibow
Posted on: Jun 5 2010, 07:55 AM


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HAYABUSA finished TCM-3. Now aiming Woomera.

2010/06/05 14:38 JST: TCM-3 operation completed, shift the target from Earth's outer rim to WPA
  Forum: Cometary and Asteroid Missions · Post Preview: #160622 · Replies: 702 · Views: 655474

akibow
Posted on: Apr 5 2010, 09:46 AM


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Oh-, the earth is small...!
Though the earth seems to be really small for spaceflight-fan. :-)
  Forum: Cometary and Asteroid Missions · Post Preview: #158127 · Replies: 702 · Views: 655474

akibow
Posted on: Apr 4 2010, 09:08 AM


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Oh----!
my wife is from Higashi, it is a village in the next of two in the Kin-cho.
And I'm from Naha.
  Forum: Cometary and Asteroid Missions · Post Preview: #158096 · Replies: 702 · Views: 655474

akibow
Posted on: Apr 4 2010, 06:50 AM


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message "Posted Apr 1 2010, 09:05 AM" is image of orbit change.
I think that an accurate numerical value is different from this.
I wanted only to show that the orbit was able to be corrected in the direction of the sun even if it cannot accelerate in the direction of the sun.

My estimate computational method is considerably rough.
In addition, ion-engine thrust time is 1.5 days in the magazine "JAXA's". but is 20 hours in another documents.
and I assumed that thrust of the ion engine is 5mN. But it is not so well-grounded.
The ratings thrust of the ion engine is 8.5mN each, but they are damaged.
(prof.Kuninaka says they restrict thrust to 5mN in magazine "JAXA's" .)
And all thrust is not used to decelerate,it accelerates in other directions. And... :-)

about this document,
https://ssl.tksc.jaxa.jp/sss/sss10/pdf/S1-5.pdf (page 21)
orbit(B-T value) is changed about 300km after TCM-3.
New perigee is underground(collision course)?

However, I think that is certain to put HAYABUSA reentry-course by deceleration ion-engine jet during a day, 9 days before flyby.
It seems to be clarified after measuring orbit after TCM-3.
  Forum: Cometary and Asteroid Missions · Post Preview: #158091 · Replies: 702 · Views: 655474

akibow
Posted on: Apr 1 2010, 12:05 AM


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QUOTE (JimOberg @ Apr 1 2010, 04:36 AM) *
Ion drive? Does the geometrical constraint of thrusting along the line-of-sight to sun eliminate this?


If hayabusa decrease speed, its orbit is shrinked and can move toward the sun.
Roughly , if hayabyusa is decreased by 5mN×1.5days at 9 days before, its delta-V is -1.3m/sec.
and hayabusa drops to the Sun in the acceleration of 6mm/sec2, 1.8 million km during 9days.
The arrival time expands by 0.004% because the HAYABUSA that flies at 33km/a second decelerates only by 1.3m/a second, and as a result the fall distance increases by 0.008% (second power at time) .
0.008% of 1.8 million km is about 140km, and it is enough to make the explorer of 200km flyby rush into the atmosphere.

This is a rough prediction, and I think that I can roughly show the concept of the orbit change in the amount of the orbit change when not thinking about the gravity of the earth.
  Forum: Cometary and Asteroid Missions · Post Preview: #157905 · Replies: 702 · Views: 655474

akibow
Posted on: Mar 31 2010, 01:21 PM


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QUOTE (nprev @ Mar 30 2010, 04:12 AM) *
Thank you very much, Subaru. I will always refer to Hayabusa as 'him' from now on! smile.gif

With no hydrazine, I am still curious as to how the fine course corrections will be accomplished, though. Someone mentioned direct venting of the remaining xenon; can this be done @ high volume through the engines? I would be amazed if any vent valves were both controllable and suitably located on the spacecraft to produce the desired results.


They say course correctuon is made by ion-engine.

http://www.jaxa.jp/pr/jaxas/pdf/jaxas031.pdf page 6-8
In Journal "JAXA's", professor Hitoshi Kuninaka says that:
Last orbit change will be done with ion-engine. It takes about 1.5days.
It is scheduled 1 week before reentry, at distance 2 or 3 million km from earth.
It is the last work of the ion-engine.

http://www.jaxa.jp/press/2010/03/20100331_sac_hayabusa.pdf
<press release - Plan for reentry of "Hayabusa" sample capsule>
According to this document, (page 7)
orbit correction is done before 60/42/21/9/3 days before reentry.
The first three operations(TCM0 to TCM2) aim at the 200km flyby course.
and fourth operation (TCM3) is to change target to Australia,
fifth operation (TCM4) is for fine-tuning.
Operation TCM-3 tooks 20 hours, by one ion-engine.(page 8)
Capsule is released 3 hours before reentry.

If ion engine is corrupted during TCM-3 and cannot recover with another engine,
Hayabusa takes escape-sequence (return to the flyby course) using Xenon gas jet. (page 12)
  Forum: Cometary and Asteroid Missions · Post Preview: #157877 · Replies: 702 · Views: 655474

akibow
Posted on: Mar 24 2010, 11:55 PM


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QUOTE (amezz @ Mar 24 2010, 01:13 AM) *
More "native" English report by Junichiro Kawaguchi - here http://www.isas.jaxa.jp/e/enterp/missions/...usa/today.shtml


Sorry, I could not find it.
You should read this document than my unskilled translation.
  Forum: Cometary and Asteroid Missions · Post Preview: #157577 · Replies: 702 · Views: 655474

akibow
Posted on: Mar 23 2010, 03:39 PM


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orbiital information
translated by akibow, parts in parentheses are supplementations by the translator.
----------------------------------
Orbital information
Mar 23rd,2010[updated]

Ion engine of "Hayabusa" is working well.
I'm sorry to have kept you waiting because there were consecutive holidays.

The display of the orbit was detailed down this week.
It is necessary to explain a little.

When reentry of Hayabusa-capsules, capsule should rush according to the spin of earth, for reducing airspeed. If you see the earth from north pole, Hayabusa enters anti-clockwise.

At present, Hayabusa has orbit to pass day side of the earth.
It is necessary to change orbit to pass over the night side of the earth.
The escape direction after swingby reverses.

Hayabusa should not take the collision course to earth, because ion engine might break (and might fix to collision couse to somewhere in the earth.)
So, we change orbit dayside to nightside through south pole side of earth.
(never pass over earth. Refer to lower right figure. )

Ion engine drives until the end of March.
At this point, A big error margin might remain.
So intentionally, we set "temporary target" that pass that away to nightside.

Hayabusa cannnot use chemical thruster, and cannot accerate easily toward/against the sun.
(ion engine jets right-angle direction against the solar panel(=sun).)
So we choose "temporary target" for convenient and accurate orbit correction.
Hayabusa will be guided toward this "temporary target".

At 20th March, estimated closest distance to earth is 460,000 km.
Soonly, passing inside of the stationary orbit surely becomes it.

Junichiro Kawaguchi
project manager of "HAYABUSA".

[CHART]
left-upper:"Change in B parameter"
Distance of the closest point to earth
when trajectory flies at that time.
left-lower:"closest point to earth, plotted on B-plane."
Roughly, holizontal axis is along the equator, leftside is toward the sun.
right-lower:"history of changing orbit (near-earth) by IES drive."
 Trace of trajectory flies. earth is center.
(red is target orbit,round orbit is moon.)
date of horizontal axis shows when trajectory flies starts,
not the day of return earth.
  Forum: Cometary and Asteroid Missions · Post Preview: #157509 · Replies: 702 · Views: 655474

akibow
Posted on: Mar 12 2010, 05:22 AM


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QUOTE (Paolo @ Mar 11 2010, 04:27 AM) *
Sake, not Scotch wink.gif


I cerebrate with awamori.

Official drink for Hayabusa is this?
http://www.isas.ac.jp/ISASnews/No.267/isas.html#op
ISAS use the label of sake for the cover of the flight plan at the explorer launch.
For Hayabusa, they chose sake "Toranoko"(chiid of Tiger, Comparison that shows the valuable one).
They say that asteroids is very valuable thing because it show us the origin of the solar system and evolution.

or this? :-)
http://www.isas.jaxa.jp/home/hayabusa-live/
  Forum: Cometary and Asteroid Missions · Post Preview: #156912 · Replies: 702 · Views: 655474

akibow
Posted on: Mar 7 2010, 12:49 PM


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Hayabusa pushes out and spin the capsule by spring. (like Kaguya-okina/ouna subsatellite)
Separation occur 60,000km from earth, 8 hours before entry.
https://ssl.tksc.jaxa.jp/sss/sss10/pdf/S1-5.pdf
if relative speed is 1m/sec, Roughly, hayabusa is 28.8km/2.3sec behind the capsule.
Hayabusa mainbody enter only 2.3*300m/s(earth rotatio at australia)=700m westside from capsule, I think.
almost same position...


QUOTE (Antdoghalo @ Mar 7 2010, 07:17 AM) *
Anybody know where the main Hayabusa spacecraft excluding the sample capsule will enter Earth atmosphere? unsure.gif

  Forum: Cometary and Asteroid Missions · Post Preview: #156615 · Replies: 702 · Views: 655474

akibow
Posted on: Mar 8 2006, 09:10 AM


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summary of press conference is here
http://smatsu.air-nifty.com/lbyd/2006/03/7...6.html#comments (Japanese)
http://jspace.misshie.jp/index.php?cmd=rea...yD%2F20060307-2 (translation)
  Forum: Cometary and Asteroid Missions · Post Preview: #44569 · Replies: 1136 · Views: 1434064

akibow
Posted on: Mar 8 2006, 03:29 AM


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rolleyes.gif JAXA succeed to get telemetry data from HAYABUSA.

http://www.isas.ac.jp/e/snews/2006/0308.shtml
  Forum: Cometary and Asteroid Missions · Post Preview: #44544 · Replies: 1136 · Views: 1434064


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