IKAROS JAXA Solar Sail mission |
IKAROS JAXA Solar Sail mission |
Mar 29 2010, 06:09 AM
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#31
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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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#32
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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 26 2011, 09:49 PM
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#33
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Mine was taken from the press kit too -- I think yours has more pixels but is just upsampled. Which is not to say that upsampling to make the image occupy more space on the screen doesn't help in interpreting the image; I just don't think it actually contains any more data.
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Feb 8 2011, 09:10 AM
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#34
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
Page 20:
4: Supplementary information Significance of solar power sailing: This is expected to lead to flexible operation of probes. It is also expected to provide enough electrical power in the vicinity of Jupitor and beyond. P |
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Feb 8 2011, 09:20 AM
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#35
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
Page 21:
There are graphs and other structures with this page, but they are self-explanetary. So, my translation is only about IKAROS specs, as follows. Main body size: 1.6 m in diam. and height 0.8 m Membrane size:s 20m by 20 m, and membrane thickess of 7.5μm Mass: 308kg, of this 16kg is the membrane mass Orbit: direct flight to Venus Orbit determination: range fidings and Doppler measurements Attitude control: by spin Propulsion: vapour and liquid equilibrium thruster and gas jet thrusters Mission duration: longer than 6 months Comms: 2 LGAs and 1 MGA P |
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Feb 9 2011, 09:03 AM
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#36
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
I will skip pages 22 and 23 as they are too obvious.
Page 24: Supplementary info on GAP 1. Small table header from left to right: GRB name, trigger time, distance, alpha, beta, angle of entering, simultaneous observation 2. With the 3 graphs here vertical axis is intensity, horizonrtal time in seconds Main text (jist of it) as follows: GAP is a ganma ray burst polariser detector. It also achives simultaneous Compton scattering counting. Power was switched one month after launch. Data is stored in memory and sent back to earth. No mulfunction to date. GAP detects polarisation of megnetic field. P |
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Feb 9 2011, 09:24 AM
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#37
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
Page 25:
4: Supplementary info on GAP (Here, I am only translating gists of what this page says, P) Primary objective of GAP is to measure polarisation of ganma ray bursts and try to understand the mechanism. However, it is only 4 months in operation and we have not yet meaure enough of these bursts. Following report (what follows?, P) is based on the collaborative work with all those GRB satellites around the world with a view to determining the directions of these bursts. Earlier page's list has data from Russian Konus satellie (K), US Fermi satellite (F), and US-Italy Swift satellite (S). For example, the burst, GRB 100826A (detected on 26 August 2010) was determined to be within the region surrounded by the blue frame with the graph here. Due to polarisation measurements IKAROS is providing additional accuracy. P |
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Feb 9 2011, 10:01 AM
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#38
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
Page 26:
4: Supplementary info on VLBI (multi tone transmitter) Result of of experiments: Succeeded in obtaining about 20 times more accuracy of orbit determination compared with earlier JAXA measurements (Hayabusa and AKATSUKI), with the thermal noise level of 50 pico seconds. Objectives of the experiments: This is a mission devoted to try out DDOR(Delta differential one-way range) techniques. Basically, very far radio emitting stars are used and the very long baseline interferrometry and triangulation is involved. Participants are as follows: University of Tasmania: Hobart26m DSN: DSS34 34m,DSS45 34m, DSS43 70m ESA: Cebreros 35m New Norcia 35m ATNF: Mopra 22m, ATCA 22m Shanghai Observatory: Urmuchi 25m, Shanghai 25m, Konmei 40m Japan, 32m, 34m, 34m and 64 m) NASA JPL is quite active in this technology, and for instance, NASA DSN were deeply involved, when required, with DDOR determination of Akatsuki, almost everyday. Collaboration has been done before, but we lacked this essential element, multi tone transmitter, and this time we developped a dedicated transmitter and used it with 8 organisations' 15 antennas with 24 pases. Comparison (orbit information) between Akatsuki and IKAROS data is as follows: Akatsuki: precision : (thermal noise) 700 pico seconds accuracy : 1 to 2 nano seconds IKAROS: precision: (thermal noise) 50 pico seconds accuracy: 50 to 150 pico seconds This comparison was made around August 2010 P |
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