Author Topic: JAXA - Akatsuki - Venus Climate Orbiter (PLANET-C) (Read 303799 times)

sdsds · « **Reply #160 on:** 10/06/2011 07:46 am »

Emily Lakdawalla, Planetary Society blogger reporting via twitter from the 2011 joint meeting of the Division of Planetary Sciences / European Planetary Science Congress, indicates Takehiko Satoh (JAXA) says latest tests indicate the Akatsuki main engine combustion chamber "no longer exists." That sounds somewhat more extreme than it having "gradually been damaged"!

yoichi · « **Reply #161 on:** 10/19/2011 07:09 am »

http://www.jaxa.jp/projects/sat/ikaros/index_e.html

October 18, 2011 Updated
Result of IKAROS 'reverse spin operation'

On Oct. 18, 2011 (Japan Standard Time), JAXA performed a "reverse spin operation" of the IKAROS. As a result of the jet thrust to shift IKAROS's spin direction to the reverse way for about 20 minutes from 7:20 a.m. on the 18th, the membrane successfully spun in the reverse course without being entangled. The IKAROS is in good shape after reversing its spin, and its spin rate at the time of completing this operation was -0.24rpm.
We are currently evaluating if we will continue the mission. For assessing it more in detail, the following information must be acquired.
1) Attitude related date from the data recorder that accumulated information during the reverse spin.
2) Data necessary for predicting future attitude change.
We will announce the detailed evaluation results as soon as we complete data acquisition and analysis.

Fuji · « **Reply #162 on:** 10/27/2011 01:13 am »

Akatsuki was complete the oxidizer dump operations in Oct. 6, 12, 13th (each 6 min. 9min. 9min).

Three RCS burns are planned in Nov. 1, 10, 21th.
First two burn duration is 600 sec, delta-V is 90 m/s.
Third burn duration will be adjusted based on necessary delta-V.

bolun · « **Reply #163 on:** 11/02/2011 03:31 pm »

November 1, 2011 Updated

AKATSUKI orbit control at perihelion

For the rendezvous with Venus, JAXA performed the first orbit control of the Venus Climate Orbiter "AKATSUKI" using the attitude control thruster (or the reactor control system, RCS) at perihelion. The operation lasted about 10 minutes from 1:22 p.m. on November 1 (Japan Standard Time.)
We will analyze telemetry data acquired throughout the operation this time, then determine the next orbit for the second orbit control scheduled for Nov. 10.

http://www.jaxa.jp/projects/sat/planet_c/index_e.html

Fuji · « **Reply #164 on:** 11/11/2011 04:56 am »

AKATSUKI's second RCS burn was finished as planned in Nov. 10. Burn duration was 544 seconds.
First RCS burn duration was 587.5 seconds.

http://www.isas.jaxa.jp/j/topics/topics/2011/1110.shtml (Japanese)

Fuji · « **Reply #165 on:** 11/22/2011 04:08 am »

AKATSUKI's third RCS maneuver was finished. Burn duration was 342 seconds.

http://www.isas.jaxa.jp/j/topics/topics/2011/1121.shtml (Japanese)

Fuji · « **Reply #166 on:** 01/11/2012 01:33 am »

In Jan 6, IKAROS was enter the hibernation mode.
Due to power generation is limited near aphelion, system was shutdowned.
will be expected retun to the normal mode in early summer.

http://www.jspec.jaxa.jp/ikaros_channel/bn018.html (Japanese)

bolun · « **Reply #167 on:** 01/12/2012 02:00 pm »

January 6, 2012 Updated

IKAROS: Details of reverse spin operation result and hibernation mode

The IKAROS project team carried out the reverse spin operation of the IKAROS on Oct. 18, 2011, and acquired detailed achievements about the operation.
We also observed that the IKAROS went into hibernation mode (meaning that onboard devices are currently shut down due to low power generation) sometime before Jan. 6, 2012, as its operational conditions brought the IKAROS away from the sun and also the angle with the sun has been unfavorable so that it cannot generate enough electricity.
The distance and angle against the sun are expected to be improved from spring 2012, thus power will be restored (from the mode coming out of hibernation.) We are preparing for trial signal receiving from the IKAROS by waiting and looking for appropriate timing around that time frame.

http://www.jaxa.jp/projects/sat/ikaros/index_e.html

catdlr · « **Reply #168 on:** 07/12/2012 05:34 pm »

NASA | Space Geodesy Profile: Chopo Ma

Published on Jul 12, 2012 by NASAexplorer
Space geodesist Chopo Ma explains the science of Very Long Baseline Interferometry (VLBI): using radio emissions from distant galaxies to create a precise reference frame for the Earth.

yoichi · « **Reply #169 on:** 09/10/2012 02:30 pm »

After 8months hibernation (lost communication), JAXA's "Ikaros" spacecraft has founded last weekend.
http://www.jspec.jaxa.jp/ikaros_channel/

plutogno · « **Reply #170 on:** 09/10/2012 07:43 pm »

are you sure about this? I have only read the google translation of the blog, and it is not clear

yoichi · « **Reply #171 on:** 09/11/2012 12:47 pm »

http://www.jaxa.jp/projects/sat/ikaros/index_e.html

September 11, 2012 Updated
IKAROS to wake up from hibernation

The IKAROS was confirmed to have shifted itself into hibernation mode (or shutting down its onboard equipment due to low power generation) sometime before Jan. 6, 2012.
After moving into hibernation mode, the IKAROS team has been searching for the IKAROS twice a month. On Sept. 6 (Thu.), 2012, a radio wave that appeared to be emitted from the IKAROS was detected.
On the 8th (Sat.) it was confirmed to be from the IKAROS, and we made sure that the IKAROS came out from hibernation mode (or recovered.) We are now checking the satellite's status.

Spiff · « **Reply #172 on:** 09/13/2012 12:45 pm »

See also Emily Lakdawalla's blog:

http://www.planetary.org/blogs/emily-lakdawalla/2012/09102155-ikaros-alive.html

yoichi · « **Reply #173 on:** 03/28/2013 02:33 pm »

http://www.jspec.jaxa.jp/e/hottopics/20130328.html

Disorganization of project teams, Space missions "Hayabusa" and "Ikaros"

Space missions "Hayabusa" and "Ikaros" were reviewed by Lunar & Planetary Exploration Group (JSPEC) and concluded the accomplishment of original purposes and project procedures and then disorganization of both project teams, which appreciate world-wide collaboration and support. The space achievements and heritages by both missions will contribute to the following space enterprises. The asteroid material with its curation is transferred to ISAS and devoted to research on space science.

plutogno · « **Reply #174 on:** 03/28/2013 05:31 pm »

what does it mean for IKAROS? team disbanded, no more attempts at contact?

russianhalo117 · « **Reply #175 on:** 03/28/2013 05:37 pm »

That is what I get out of the JAXA translation.

Fuji · « **Reply #176 on:** 03/28/2013 09:31 pm »

Quote from: plutogno on 03/28/2013 05:31 pm

what does it mean for IKAROS? team disbanded, no more attempts at contact?

This anounce is based on the project perspective.
Not finished IKAROS operations.
IKAROS has run out of propellant. So, can't attitude control.Therefore, Next contact oppotunity is NET early summer.

IKAROS Ops. team is still wishing to get the membranae degradation data of the IKAROS for the future Solar Power Sail development.

Robotbeat · « **Reply #177 on:** 06/06/2013 09:56 pm »

Fuji, what is the status of Akatsuki? Still on-track for the orbit-insertion attempt in a couple years?

Thanks!

Additionally, have any more IKAROS contact attempts been made yet? It's almost early summer...

Fuji · « **Reply #178 on:** 06/07/2013 02:38 pm »

Quote from: Robotbeat on 06/06/2013 09:56 pm

Fuji, what is the status of Akatsuki? Still on-track for the orbit-insertion attempt in a couple years?

Thanks!

Additionally, have any more IKAROS contact attempts been made yet? It's almost early summer...

Still no news.
Akatsuki is on-track for the orbit-insertion attempt in 2015.

Same as IKAROS, Communication cantact attempt is limited due to human resources. We need waiting more.

plutogno · « **Reply #179 on:** 06/08/2013 09:59 am »

Akatsuki mission update (Nov 2012)
http://www.lpi.usra.edu/vexag/meetings/archive/vexag_10th/Nov2012/presentations/12_Akatsuki_Imamura.pdf