Author Topic: H-IIA - Akatsuki - Venus Climate Orbiter (PLANET-C) - May 20, 2010  (Read 271848 times)

Online robertross

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Again, second test burn result is no joy. Thrust level was small.
May be engine throat was heavy dameged.

Next option will be using the RCS. In this case, to reduce the spacecraft weight oxidizer will be dumped. Planned Venus orbit will be need to change. Some of the science objective will not achieved.


That's too bad. Thanks Fuji.

Offline bolun

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September 15, 2011 Updated

AKATSUKI: Second orbit maneuver engine test result

JAXA conducted the second jet thrust test(*1) from the orbit maneuver engine (OME) aboard the Venus Climate Orbiter "AKATSUKI" (PLANET-C) on Sept. 14 (Japan Standard Time.) Through analysis of acquired test data, we found that acceleration by the jet thrust was less than the expected value similarly to the first test result.
Based on those test results, we would like to study the measures to be taken.

The satellite is in condition after the second test.

*1: The second test aimed at reconfirming the status of the jet thrust from the OME. The test duration was about five seconds as planned.

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

Offline bolun

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September 30, 2011 Updated

AKATSUKI scheduled to perform orbit maneuver in Nov. to meet with Venus

The Venus Climate Orbiter “AKATSUKI” (PLANET-C) conducted a trial jet thrust of its onboard orbit maneuver engine (OME) twice on September 7 and 14, but acceleration by the thrust was only about one ninth of expectations, and the generated thrust was also only about 40 Newton. With these results, we found that we cannot gain enough specific impulse for orbit maneuvering by the OME. Also, we suspect that the OME may have gradually been damaged; therefore, we decided not to use the OME. We will carry out the orbit maneuver using the reactoion control system (RCS) thruster to meet Venus in 2015. We plan to conduct a peri-Venus orbit maneuver in early November.

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

Offline Fuji

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To reduce the spacecraft weight oxidizer (approximately 64kg) will be dumped in october.

RCS thruster are 23 Newton X 4.

Offline sdsds

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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"!
— 𝐬𝐝𝐒𝐝𝐬 —

Offline yoichi

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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.

Offline Fuji

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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.

Offline bolun

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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

Offline Fuji

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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)

Offline Fuji

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

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

Offline Fuji

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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)

Offline bolun

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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

Online catdlr

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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.

Tony De La Rosa

Offline yoichi

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

Offline plutogno

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

Offline yoichi

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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.
« Last Edit: 09/11/2012 12:49 pm by yoichi »

Offline Spiff

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I always consider space to be the FIRST frontier.

Offline yoichi

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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.

Offline plutogno

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

Offline russianhalo117

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That is what I get out of the JAXA translation.

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