Author Topic: JAXA - Akatsuki - Venus Climate Orbiter (PLANET-C) (Read 305976 times)

TheFallen · « **Reply #120 on:** 12/07/2010 07:45 am »

Some distant shots of Earth and the Moon that Akatsuki took on October 26...

http://www.stp.isas.jaxa.jp/venus/

Fuji · « **Reply #121 on:** 12/07/2010 12:07 pm »

Akatsuki has been entered the "safe hold mode".
Medium-gain antenna wasn't available. Low-gain antenna only.
Due to very limited telemetory information, situation has remained more uncertain.

Yomiuri report.
http://translate.google.com/translate?u=http%3A%2F%2Fwww.yomiuri.co.jp%2Fscience%2Fnews%2F20101207-OYT1T00851.htm&sl=ja&tl=en&hl=&ie=UTF-8

Edit: JAXA press briefing information.
It seems Middium-gain is available 40sec/10min (rotaiting per 10 minutes).
Medium-gain 512bps, Low-gain 8 bps.
Orbit data would be confirmed tomorrow noon.

Bubbinski · « **Reply #122 on:** 12/07/2010 02:01 pm »

This reminds me of the time when Magellan entered orbit around Venus....as I recall from radio news reports at the time JPL lost contact with the probe for a while and the probe was in safe mode.

Hope everything's going to be all right with Akatsuki.

robertross · « **Reply #123 on:** 12/07/2010 03:02 pm »

Quote from: Fuji on 12/07/2010 12:07 pm

Akatsuki has been entered the "safe hold mode".
Middium-gain antenna wasn't available. Low-gain antenna only.
Due to very limited telemetory information, situation has remained more uncertain.

Yomiuri report.
http://translate.google.com/translate?u=http%3A%2F%2Fwww.yomiuri.co.jp%2Fscience%2Fnews%2F20101207-OYT1T00851.htm&sl=ja&tl=en&hl=&ie=UTF-8

Edit: JAXA press briefing information.
It seems Middium-gain is available 40sec/10min (rotaiting per 10 minutes).
Middium-gain 512bps, Low-gain 8 bps.
Orbit data would be confirmed tomorrow noon.

FYI: 'Medium'

Low, Medium, High...Gain Antennas.

TheFallen · « **Reply #124 on:** 12/08/2010 01:21 am »

It's Nozomi all over again...

http://www.planetary.org/blog/article/00002809/

Akatsuki failed to enter Venus orbit.

robertross · « **Reply #125 on:** 12/08/2010 01:47 am »

Quote from: TheFallen on 12/08/2010 01:21 am

It's Nozomi all over again...

http://www.planetary.org/blog/article/00002809/

Akatsuki failed to enter Venus orbit.

"BUMMER" is right (as per the article)

Must be some long faces in Japan (and now one in Canada)

Bubbinski · « **Reply #126 on:** 12/08/2010 01:52 am »

Yikes! And it won't be near Venus for 7 years.

Is the craft on a trajectory where they can at least adjust it to fly by a near earth asteroid or two, or perhaps Earth/Moon or Mercury? Maybe that will salvage something out of this mission.

Very bad news indeed.

Lsquirrel · « **Reply #127 on:** 12/08/2010 05:20 am »

http://admin.brightcove.co.jp/viewer/jp1.24.04.00.2010-11-30210623/BrightcoveBootloader.swf?purl=http%3A%2F%2Fwww.nikkei.com%2Fvideo%2F%3Fbclid%3D67421386001%26bctid%3D702380967001&%40videoPlayer=702380967001&autoStart=false&bgcolor=%23FFFFFF&flashID=myExperience&height=547&isUI=true&isVid=true&lineupID=67421386001&playerID=57544160001&publisherID=46434333001&videoID=702380967001&width=790

ugordan · « **Reply #128 on:** 12/08/2010 07:52 am »

A real shame for the mission. I had a sinking feeling this would be the result knowing the spacecraft entered safe mode at some point and it required the vast majority of the burn to be completed to get captured by Venus.

This month didn't exactly get off with a good start for aerospace.

johnxx9 · « **Reply #129 on:** 12/08/2010 08:57 pm »

Akatsuki probe overshoots Venus, attempt to be remade in 6 years

Quote

Officials said that they believe that when Akatsuki was approaching its orbital entry point and engaged its reverse thrusters, the thrusters cut off before the probe could sufficiently reduce its speed, and the probe is now heading away from the planet.

Quote

Another attempt will be made to put Akatsuki into orbit around Venus when the probe comes close to the planet again in six years' time.

Quote

Akatsuki was launched in May. After coming within 550 kilometers of Venus on Dec. 7, it initiated its reverse thrusters and started to change course. But soon afterwards, the probe moved into Venus' shadow, and communications were cut off. A connection was later established via a low-gain antenna on the probe that is automatically activated in emergencies, but for some time the probe's status remained largely unknown.

Quote

The probe's reverse thrusters needed to be fired for at least 9 minutes and 20 seconds, but appear to have stopped after only two to three minutes.

Quote

Akatsuki will again approach Venus in December 2016 and January 2017. Ordinarily it would end up about 3.7 million kilometers away from the planet, but its trajectory can be modified to bring it closer.

Fuji · « **Reply #130 on:** 12/08/2010 08:59 pm »

Two minutes and 23 seconds after OME injection, X-axis was suddenly rotating 360 deg.

http://translate.google.com/translate?u=http%3A%2F%2Fjournal.mycom.co.jp%2Farticles%2F2010%2F12%2F09%2Fplanet-c_detail%2F&sl=ja&tl=en&hl=&ie=UTF-8

Salo · « **Reply #131 on:** 12/09/2010 10:15 pm »

Yomiuri Shimbun:
JAXA scratching head over Akatsuki failure
Suspected engine trouble casts shadow
Hopes dashed during 20-minute silence

Salo · « **Reply #132 on:** 12/09/2010 10:23 pm »

Akatsuki probe began unexpectedly spinning after firing thruster

Quote

The Akatsuki probe is thought to have spun in the direction indicated by the white arrows.
The cone on the right side is part of the ceramic thruster.
Image courtesy of JAXA, with modifications.

Fuji · « **Reply #133 on:** 12/10/2010 03:17 am »

Quote from: Fuji on 12/08/2010 08:59 pm

Two minutes and 23 seconds after OME injection, X-axis was suddenly rotating 360 deg.

Data was corrected by JAXA.
From "Two minutes and 23 seconds" to 152 sec.
From "360 deg" to 42 deg.

Fuel feeding anomaly is discussing now.

Salo · « **Reply #134 on:** 12/10/2010 01:04 pm »

Mainichi Daily News:
Akatsuki's fuel pressure plunged before failure to enter Venus orbit: JAXA

Fuji · « **Reply #135 on:** 12/10/2010 08:08 pm »

AKATSUKI's first shots of Venus taken during health check
http://www.isas.jaxa.jp/e/topics/2010/1210.shtml

seshagirib · « **Reply #136 on:** 12/11/2010 08:06 am »

ohh....feels like a rerun of the Hayabusa return trip all over again

TheFallen · « **Reply #137 on:** 12/13/2010 01:21 am »

According to the link below, IKAROS made its flyby of Venus from a distance of 80,000 km on December 8...

http://www.isas.jaxa.jp/home/IKAROS-blog/i....php?itemid=786

I thought the solar sail wasn't suppose to fly past Venus till December 18. Oh well.

Salo · « **Reply #138 on:** 12/18/2010 07:58 pm »

Nozzle may have doomed Akatsuki, but could also save it.
Japanese space probe most likely overshot Venus due to engine trouble.
Akatsuki orbit failure laid to broken engine nozzle.

Salo · « **Reply #139 on:** 12/29/2010 07:28 am »

Yomiuri Shimbun: Faulty valve caused Akatsuki failure
Mainichi Daily News: Failure of Venus probe Akatsuki likely due to faulty valve