Akatsuki Venus Climate Orbiter |
Akatsuki Venus Climate Orbiter |
Mar 13 2010, 11:29 AM
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#1
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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 |
I thought it was time to start a separate thread on this mission, launching soon
some good medium-resolution images of the spacecraft are available on JAXA digital archives http://jda.jaxa.jp/jda/p3_e.php?time=N&...mp;mission=4066 |
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Guest_Enceladus75_* |
Dec 9 2010, 06:08 PM
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#2
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Guests |
No one here is suitable qualified to make such a judgement. True, but surely a degree of speculation as to what may have caused the problems with Atasuki is warranted. The evidence so far points to a dificulty with the thrusters. Didn't Hyabusa and Nozomi both also have thruster problems? |
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Dec 10 2010, 01:03 PM
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#3
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Member Group: Members Posts: 817 Joined: 17-April 10 From: Kamakura, Japan Member No.: 5323 |
True, but surely a degree of speculation as to what may have caused the problems with Atasuki is warranted. The evidence so far points to a dificulty with the thrusters. Didn't Hyabusa and Nozomi both also have thruster problems? JAXA have examined the records, fuel flow and engine temp etc etc. As a result, they found that fuel pressure started drecreasing immediately after the retro started. The power dropped accordingly. Heilum gas was supposed to maintain the tank pressure, but it did not. The same thing happned with NOZOMI in 1998. They suspect design faults with the pipings and valves. So, my guess is that all the hope has been lost for another try in 6 years. Pandaneko |
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Dec 10 2010, 08:11 PM
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#4
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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 |
So, my guess is that all the hope has been lost for another try in 6 years. the problem with propellant pressure and thruster misfire was not what doomed Nozomi. Nozomi was crippled by a series of hardware failures and mishaps in the years it spent orbiting the Sun. It lost most of its capabilities to communicate with Earth as well as thermal control, which let hydrazine freeze. Hopefully the same will not happen to Akatsuki. Still, I can't see the link between the pressure loss and asymmetric thrust and spin |
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Dec 10 2010, 08:18 PM
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#5
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
the problem with propellant pressure and thruster misfire was not what doomed Nozomi. Nozomi was crippled by a series of hardware failures and mishaps in the years it spent orbiting the Sun. It lost most of its capabilities to communicate with Earth as well as thermal control, which let hydrazine freeze. Hopefully the same will not happen to Akatsuki. Still, I can't see the link between the pressure loss and asymmetric thrust and spin I think people were thinking of the fact that Nozomi achieved insufficient velocity when leaving the Earth-Moon system, which is why it was not already orbiting Mars when it was crippled by those mishaps. -------------------- |
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