IKAROS JAXA Solar Sail mission |
IKAROS JAXA Solar Sail mission |
Mar 29 2010, 06:09 AM
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#101
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Member Group: Members Posts: 202 Joined: 9-September 08 Member No.: 4334 |
IKAROS sounds really cool, is there any website to find more info on it?
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Mar 29 2010, 07:19 PM
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#102
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Member Group: Members Posts: 540 Joined: 25-October 05 From: California Member No.: 535 |
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 -------------------- 2011 JPL Tweetup photos: http://www.rich-parno.com/aa_jpltweetup.html
http://human-spaceflight.blogspot.com |
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Jan 6 2012, 11:07 AM
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#103
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
if I understand correctly today's release, IKAROS has been put into hibernation owing to the large distance from the Earth and Sun, making communication difficult and owing to the quasi-depletion of its reserves of gas for attitude control
http://www.jspec.jaxa.jp/ikaros_channel/bn018.html pandaneko, can you confirm? |
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Jan 21 2012, 09:50 AM
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#104
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
if I understand correctly today's release, IKAROS has been put into hibernation owing to the large distance from the Earth and Sun, making communication difficult and owing to the quasi-depletion of its reserves of gas for attitude control http://www.jspec.jaxa.jp/ikaros_channel/bn018.html The rest of this release follows below. ◆ About the shitft into hibernation mode Ikaros' behaviour after the reverse spin operation is now known to be like: (1) Owing to the gradually increasing reverse spin rate the sun angle has been increasing and IKAROS has transferred from Solar photon pressure priority (*1) navigation mode to inertial guidance priority navigation mode (*2). (2) IKAROS is currently flying on an elliptical orbit around the Sun, and its Solar distance in AU will continue to increase until March 2012 when it passes the furthest point from the Sun. (3) Due to above (1), (2) a decrease in power is expected. As a result of this, if the generated power is less than the consumption power, then IKAROS will go into hibernation mode (i.e., shutting down instruments on board) (4) Even if we tried the spin rate down operation (or, attitude control) by gas jet control our conclusion is that we will not be able to obtain dramatic changes as the remaining amount of fuel is so low. (*1) Solar photon pressure priority mode: IKAROS' attitude is strongly influenced by the Solar photons. Membrane is facing the Sun. (*2) Inertially guided direction priority mode: IKAROS' increasing spin rate is forcing IKAROS to take up the attitude (orientation) that is strongly influennced by this spin rate change. In the case of IKAROS, it is the increasing Sun angle. Based on these behaviours we have not attempted any attitude control since early December and have simply continued to obtain the attitue data as the Sun angle increased, trying to check on the health of IKAROS. Consequently, we are pleased to inform you that IKAROS has entered into hibernation mode by today. From now on, we will try to investigate the possibility of signal reception once after the hibernation. End of this release P |
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