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JUICE, ESA's L-class mission to the Jovian system
bobik
post Jul 8 2023, 09:14 AM
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On 3 July the commissioning of the PEP instrument package was successfully completed, albeit the last sentence of the press release sounds somewhat suspicious. dry.gif

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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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bobik
post Aug 8 2023, 06:51 AM
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JUICE is currently in Cruise configuration.
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rlorenz
post Aug 9 2023, 01:52 AM
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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.


QUOTE (bobik @ Jul 8 2023, 05:14 AM) *
On 3 July the commissioning of the PEP instrument package was successfully completed, albeit the last sentence of the press release sounds somewhat suspicious. dry.gif

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djellison
post Aug 9 2023, 04:15 AM
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QUOTE (rlorenz @ Aug 8 2023, 06:52 PM) *
(e.g. I think there was measurable thrust from ougassing on MSL for a couple of weeks after launch)


I once heard someone describe InSIGHT cruise as "Farting all the way to Mars"
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stevesliva
post Aug 9 2023, 05:59 PM
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Spin-stabilized cropdusting if you're being polite.
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propguy
post Aug 10 2023, 02:57 PM
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QUOTE (stevesliva @ Aug 9 2023, 10:59 AM) *
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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bobik
post Nov 15 2023, 06:04 AM
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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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nogal
post Nov 17 2023, 08:52 PM
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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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stevesliva
post Nov 17 2023, 09:16 PM
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QUOTE (nogal @ Nov 17 2023, 03:52 PM) *
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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Decepticon
post Nov 18 2023, 05:06 AM
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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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StargazeInWonder
post Nov 18 2023, 05:27 AM
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Don't you count Earth as a bonus target? smile.gif

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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bobik
post Dec 1 2023, 09:02 AM
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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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bobik
post Feb 3 2024, 06:40 AM
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Payload Checkout Window #1 (PCW1) apparently ended yesterday. Will ESA or the instrument teams give us an update on payload status, I wonder? smile.gif
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bobik
post Mar 21 2024, 07:28 AM
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QUOTE (rlorenz @ Aug 9 2023, 02:52 AM) *
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.
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