Author Topic: H-IIA - Akatsuki - Venus Climate Orbiter (PLANET-C) - May 20, 2010  (Read 271839 times)

Offline yoichi

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http://global.jaxa.jp/projects/sat/ikaros/topics.html#topics4577

Apr. 30, 2015 Updated
IKAROS wakes up from hibernation mode for the 4th time

The IKAROS seemed to wake up from its hibernation mode in mid March 2015, and JAXA searched for it based on its attitude and orbit prediction to receive its radio waves. On April 23 (Thu.), we successfully found the IKAROS, which is flying at a distance of about 120 million kilometers from the Earth.
 We will continue to receive data from the IKAROS until May to confirm its condition and analyze the information.

The IKAROS, launched in May 2010, completed its mission, and is now revolving around the sun about every 10 months. Power generation is insufficient for seven months out of 10 so the IKAROS goes into hibernation mode for this period by shutting down instruments. For the remaining three months, the IKAROS is awake with enough power so that we can receivedata from it.

« Last Edit: 05/02/2015 08:49 am by yoichi »

Offline plutogno

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Offline plutogno

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Offline catdlr

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July 2015 Venus Climate Orbiter "Akatsuki" course correction operation

Published on Aug 4, 2015
Orbit correction operation of the Venus Climate Orbiter "Akatsuki" was carried out in July 31, 2015.
The course correction was able to perform as planned.
It will be re-introduced into the Venus in December 7, 2015.

Tony De La Rosa

Offline Star One

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Tiny thrusters to do heavy lifting as Japanese probe approaches Venus

Quote
While acknowledging the Dec. 7 maneuver is risky, Imamura said “we do not think of this operation as very dangerous.”

The smaller thrusters aboard Akatsuki generate just 5 pounds of thrust, a fraction of the power provided by the probe’s main engine. Even with four of the rocket jets operating — there are two sets of four pointing forward and aft from Akatwuki’s main body — the secondary thrusters do not have the energy to put the spacecraft into its originally planned orbit.

Instead, Akatsuki will go into a higher orbit than intended, and the change has some impact to the craft’s science mission, Imamura said.

Rather than taking about 30 hours to complete a lap around Venus — as was planned after the botched 2010 arrival — Akatsuki will complete one orbit every 15 days. Another maneuver in March will nudge Akatsuki closer to Venus, placing the probe in a nine-day orbit.

Imamura said three of Akatsuki’s five cameras were recently switched on for the first time in more than four years, and they appeared to be in good health. The other two cameras will be activated once the probe is in orbit at Venus.

Engineers plan to instruct Akatsuki to turn its cameras toward Venus immediately after the insertion burn in a bid to collect “contingency” imagery of the planet in case the maneuver fails.

http://spaceflightnow.com/2015/11/18/tiny-thrusters-to-do-heavy-lifting-as-japanese-probe-approaches-venus/

Offline Zed_Noir

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Tiny thrusters to do heavy lifting as Japanese probe approaches Venus
<snip>

JAXA don't have any other options. Either roasting the thrusters or abort the mission.

Offline Fuji

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Akatsuki VOI Realtime Simulation.
http://www.lizard-tail.com/isana/orbview/misc/akatsuki_orbit_insertion.html

Akatsuki wiill be VOI burn tomorrow.  1145 sec burn will be the longest for Akatsuki's RCS.

Offline plutogno

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Offline Fuji

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VOI burn will be start at December 6, 23:51 (UTC).

Online Galactic Penguin SST

Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery. Current Priority: Chasing the Chinese Spaceflight Wonder Egg & A Certain Chinese Mars Rover

Online Galactic Penguin SST

10 minutes to the critical 20 minutes long VOI burn; spacecraft conditions are nominal as it slipped into Venus' shadow some minutes ago.
Astronomy & spaceflight geek penguin. In a relationship w/ Space Shuttle Discovery. Current Priority: Chasing the Chinese Spaceflight Wonder Egg & A Certain Chinese Mars Rover

Offline russianhalo117

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10 minutes to the critical 20 minutes long VOI burn; spacecraft conditions are nominal as it slipped into Venus' shadow some minutes ago.
Live webcast:

Offline russianhalo117

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VOI Burn 1 has started

Offline russianhalo117

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im touching wood that the burn goes well

Offline TheFallen

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Watch those four thrusters burn...

Offline russianhalo117

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VOI-R1 (Retro-1) Burn has reached scheduled completion.

SC now being auto commanded to rotate 180 degrees to present the other side of thrusters for backup VOI-R1c (Retro 1 Contingency) burn.

Standing by for AOS between Earth and SC for SC and VOI-R1 burn status.

If found required VOI-R1c burn will be commanded by the ground.
« Last Edit: 12/06/2015 11:18 pm by russianhalo117 »

Offline russianhalo117

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Attitude change for VOI-R1c complete.

Now awaiting AOS.
« Last Edit: 12/06/2015 11:18 pm by russianhalo117 »

Offline TheFallen

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First burn complete. Screenshot of Akatsuki rotating to allow a second burn with rear thrusters if necessary.

Offline russianhalo117

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Approaching VOI-C3

Offline russianhalo117

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in VOI-C3

Handshakes underway

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