JUICE, ESA's L-class mission to the Jovian system |
JUICE, ESA's L-class mission to the Jovian system |
Jul 8 2023, 09:14 AM
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#106
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Member Group: Members Posts: 255 Joined: 28-October 12 Member No.: 6732 |
On 3 July the commissioning of the PEP instrument package was successfully completed, albeit the last sentence of the press release sounds somewhat suspicious.
QUOTE The scientific team behind PEP have checked that the basic systems work but during the journey towards the Jovian system they have to make further functional tests of the instruments’ high-voltage systems.
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Aug 8 2023, 06:51 AM
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#107
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Member Group: Members Posts: 255 Joined: 28-October 12 Member No.: 6732 |
JUICE is currently in Cruise configuration.
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Aug 9 2023, 01:52 AM
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#108
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Member Group: Members Posts: 613 Joined: 23-February 07 From: Occasionally in Columbia, MD Member No.: 1764 |
I don't know any specifics here, but outgassing can take a long time to die away completely (e.g. I think there was measurable thrust from ougassing on MSL for a couple of weeks after launch), and you dont want to power up high voltage systems if there is a residual atmosphere or arcing may occur. So this may just be unhurried prudence. I think some of the covers on Cassini's instruments were only opened/jettisoned several years after launch, after the inner solar system flybys were completed.
On 3 July the commissioning of the PEP instrument package was successfully completed, albeit the last sentence of the press release sounds somewhat suspicious. |
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Aug 9 2023, 04:15 AM
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#109
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
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Aug 9 2023, 05:59 PM
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#110
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Senior Member Group: Members Posts: 1591 Joined: 14-October 05 From: Vermont Member No.: 530 |
Spin-stabilized cropdusting if you're being polite.
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Aug 10 2023, 02:57 PM
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#111
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Junior Member Group: Members Posts: 48 Joined: 8-August 12 Member No.: 6507 |
Spin-stabilized cropdusting if you're being polite. Actually InSight was 3 axis stabilized, not a spinner. If the quote about the farting came from the ops team it was more related to the fact that without reaction wheels we used the 4.5 N thrusters in minimum impulse mode to control pointing for the entire cruise (the the fart reference). We did see outgassing for a lot of cruise (all of the moisture in the MLI and other elements within the aeroshell had to vent out one location in the backshell). |
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Nov 15 2023, 06:04 AM
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#112
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Member Group: Members Posts: 255 Joined: 28-October 12 Member No.: 6732 |
On Friday, Nov. 17, starting at around 15:16 UTC, JUICE will perform a Deep Space Manoeuvre (DSM) lasting about 43 minutes and imparting a change in speed of about 200m/s to the spacecraft, according to WebGeocalc.
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Nov 17 2023, 08:52 PM
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#113
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Member Group: Members Posts: 963 Joined: 15-June 09 From: Lisbon, Portugal Member No.: 4824 |
The maneuver went well, according to today's news from ESA.
JUICE is now positioned for a first: a double Moon-Earth gravity assist flyby on August 2024. Link to ESA article: https://www.esa.int/Enabling_Support/Operat...arth-Moon_flyby Fernando |
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Nov 17 2023, 09:16 PM
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#114
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Senior Member Group: Members Posts: 1591 Joined: 14-October 05 From: Vermont Member No.: 530 |
The maneuver went well, according to today's news from ESA. JUICE is now positioned for a first: a double Moon-Earth gravity assist flyby on August 2024. Link to ESA article: https://www.esa.int/Enabling_Support/Operat...arth-Moon_flyby Might not fire main engine again until Jupiter Orbit Insertion, in 2031. (!) |
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Nov 18 2023, 05:06 AM
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#115
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Senior Member Group: Members Posts: 1276 Joined: 25-November 04 Member No.: 114 |
Does Juice have any bonus targets on way to Jupiter?
I haven't been able to find any mentions of possible targets. |
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Nov 18 2023, 05:27 AM
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#116
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Member Group: Members Posts: 251 Joined: 14-January 22 Member No.: 9140 |
Don't you count Earth as a bonus target?
There's also asteroid 223 Rosa, possibly. But if so, that's six years away. If so, it's quite a large one – only three larger asteroid belt objects have been visited by spacecraft. Rosa is a little smaller than Lutetia. https://www.nasaspaceflight.com/2023/03/jui...roject-manager/ |
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Dec 1 2023, 09:02 AM
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#117
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Member Group: Members Posts: 255 Joined: 28-October 12 Member No.: 6732 |
Today at 15:30 UTC, JUICE is going to perform the second, with a duration of about 134 seconds and a change in speed of approximately 10 m/s much smaller second part of the Deep Space Manoeuvre (DSM), according to WebGeocalc.
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Feb 3 2024, 06:40 AM
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#118
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Member Group: Members Posts: 255 Joined: 28-October 12 Member No.: 6732 |
Payload Checkout Window #1 (PCW1) apparently ended yesterday. Will ESA or the instrument teams give us an update on payload status, I wonder?
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Mar 21 2024, 07:28 AM
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#119
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Member Group: Members Posts: 255 Joined: 28-October 12 Member No.: 6732 |
I don't know any specifics here, but outgassing can take a long time to die away completely ... Exactly, nice article (in Swedish) on the physics of the out-gassing issues of high-voltage instruments in the example of JUICE's JDC instrument, first high-voltage testing in summer. EDIT: A brief account (in Japanese) of the initial post-launch check-out of the JNA instrument, during initial checkout the high-voltage output was limited to about 10 to 15% of the maximum level. After periodic checkouts, the high-voltage output will be gradually boosted to the level required for normal operation in the summer of 2026. |
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Apr 18 2024, 05:41 AM
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#120
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Member Group: Members Posts: 255 Joined: 28-October 12 Member No.: 6732 |
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