Juno at Jupiter, mission events as they unfold |
Juno at Jupiter, mission events as they unfold |
Jul 5 2016, 07:53 PM
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#1
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This topic will consist of discussion of Juno operations post-JOI until end of mission, currently anticipated in Feb 2018.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Oct 18 2016, 03:59 PM
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#2
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Junior Member Group: Members Posts: 51 Joined: 31-December 10 From: Earth Member No.: 5589 |
Would there be any problem with pressurizing the system a couple of days ahead of time before the PRM? Could the system hold pressurization that long?
Propguy, are you still here? |
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Oct 18 2016, 06:59 PM
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#3
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Junior Member Group: Members Posts: 48 Joined: 8-August 12 Member No.: 6507 |
Would there be any problem with pressurizing the system a couple of days ahead of time before the PRM? Could the system hold pressurization that long? Propguy, are you still here? Yes I am still here. I really can't talk much about what has happened other than what was put in the press release. We do pressurize up the system ahead of the burn (in fact since DSM1 it really is a re-pressurization bring the tanks up only 10 psi or so). We had done this same approach for DSM1 and JOI (we left the system open to the pressurization system between DSM1 and DSM2 since they were only 15 days apart, the rest of the time there are pyro isolation valves we use to keep propellant vapors from diffusing into the gas side components and creating issues). When we did the valve firing and pressurization last week two of the check valves stuck closed for a few minutes and then opened. The issue is if the check valves for one propellant tank were to stick close during the burn it would drive the main engine operating conditions outside of the qualified limits and could cause engine failure. Thus to be safe the program deiced to skip PRM this perijove and we are now looking at lots of options for doing a burn on a subsequent perijove. This is a concern but not something that will keep the program from achieving a proper and final science orbit. Sorry I can't say much else since nothing is decided yet. S/C now has generic science sequences loaded and running (i..e gathers science but no specific targeting sequences on board to view any given element or feature) so this becomes a science pass instead. |
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