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IKAROS JAXA Solar Sail mission
punkboi
post Mar 29 2010, 07:19 PM
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QUOTE (Vultur @ Mar 28 2010, 10:09 PM) *
IKAROS sounds really cool, is there any website to find more info on it?


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

Photos: http://jda.jaxa.jp/jda/p3_e.php?mode=level...mp;mission=9095

Description Page: http://www.jspec.jaxa.jp/e/activity/ikaros.html


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pandaneko
post Apr 23 2010, 02:34 PM
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Here is a movie about the Ikaros. It is a bit long, but it should give you some idea.

http://www.youtube.com/watch?v=7_6HOqBkP2o

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punkboi
post May 8 2010, 07:36 AM
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Akatsuki and IKAROS about to be transported to the VAB for mating to H-2A rocket

http://twitter.com/ikaroskun/status/13593614219

And here are photos showing the aluminum plates containing 63,248 names and a Planetary Society-provided DVD containing 89,000 names (that were submitted online between December of last year and March 22) being installed onto IKAROS
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JTN
post May 11 2010, 08:50 PM
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(We don't seem to have a dedicated IKAROS thread, so...)
QUOTE (pandaneko @ Apr 23 2010, 02:34 PM) *
Here is a movie about the Ikaros. It is a bit long, but it should give you some idea.
http://www.youtube.com/watch?v=7_6HOqBkP2o

In Japanese (which I can't understand), but that implies that a free-flying craft will be deployed from IKAROS just to take photos of the deployed sail. (Around 9:30.) K3wl.

Anyone know of an English-language (or translatable) resource that describes in detail what instruments/equipment (e.g., cameras, radios) are on board IKAROS? The press kit just mentioned is the best I've seen so far, but there's hints of stuff in the video that's not mentioned there (such as the aforementioned free-flyer).

I'm impressed how much functionality they've crammed onto the sail itself -- it's not just a passive sail, it has solar cells, a dust counter, "liquid crystal device that controls attitude by changing light reflection characteristics", etc. Hope it all works.
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Juramike
post May 16 2010, 10:19 PM
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JAXA set to launch a solar sail technology demonstration mission:
space.com article: http://www.space.com/businesstechnology/ja...ion-100516.html


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Paolo
post May 31 2010, 05:08 PM
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IKAROS has been spun up to 25 rpm in preparation for sail deployment within the next few days.
The counterweights that will draw out the sail masts have been deployed (see pictures in http://www.jspec.jaxa.jp/ikaros_channel/bn004.html


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akibow
post 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


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akibow
post 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.

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nprev
post Jun 6 2010, 06:24 PM
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Argh. Thanks very much, Akibow.

The IKAROS team is going about the deployment slowly & cautiously, and that's eminently sensible. It's gonna be done right!


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akibow
post Jun 6 2010, 11:41 PM
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related article.
http://www.planetary.org/blog/article/00002527/


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akibow
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akibow
post 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


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akibow
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Paolo
post Jun 7 2010, 06:50 PM
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my impression is that IKAROS, in its current semi-deployed status is just spinning up like a propeller due to solar radiation pressure, which in itself would be proof that the sail is working


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akibow
post 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


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akibow
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punkboi
post Jun 8 2010, 07:44 AM
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Sail Deployment Schedule for IKAROS

(SUCCESSFUL) June 2 (Wednesday) evening - midnight: pre-deployment check sail (motor and commissioning)

(SUCCESSFUL) June 3 (Thursday) evening - the night: the early development of first stage sail deployment

(SUCCESSFUL) June 4 (Friday) evening - midnight: Day 2 Official first stage sail deployment

June 08 (Tuesday) evening - midnight: Day 3 Official second (and final) stage sail deployment

Tuesday, June 09 (Wednesday) evening - midnight: Review of second stage sail deployment

http://www.isas.jaxa.jp/home/IKAROS-blog/


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BrianJ
post Jun 8 2010, 03:21 PM
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Another fascinating mission from JAXA :-) Hope it all goes well.

Can anyone tell me if it is planned to put IKAROS into orbit around Venus? Is it possible?
Or will there be a flyby?

Is there any information available about how much force/acceleration the sail experiences due to solar wind and radiation pressure?

Thanks and regards,
Brian
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