James Webb telescope launch info

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Re: James Webb telescope launch info

#101  Postby newolder » Apr 08, 2022 6:50 pm

The Mid Infrared Instrument MIRI has reached operating temperature below 7K and the final instrument alignment procedure can begin...
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Re: James Webb telescope launch info

#102  Postby Macdoc » Apr 09, 2022 1:34 am

:popcorn: can't wait for first real light
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Re: James Webb telescope launch info

#103  Postby newolder » Apr 28, 2022 6:11 pm

Alignment complete for all instruments:
Image
NASA blogpost
...
For this test, Webb pointed at part of the Large Magellanic Cloud, a small satellite galaxy of the Milky Way, providing a dense field of hundreds of thousands of stars across all the observatory’s sensors.
...
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Re: James Webb telescope launch info

#104  Postby hackenslash » Apr 28, 2022 7:54 pm

OMFG! That is beautiful.
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Re: James Webb telescope launch info

#105  Postby newolder » Apr 28, 2022 9:24 pm

Looking at the spectrum of Sol (shown below), where the infrared intensity drops off quickly, and these instrument responses at wavelengths longer than 1.5µm or 1500nm, makes me think there's a fuckload of red & brown dwarf stars in that Magellanic Cloud - or is it possible that some of those dots are gas-giant planets (it's possible to double zoom those images, if one opens them in a tab of their own)? :dunno:
Image

I got this in reply from Mark McCaughrean, Senior Advisor for the JWST team:
The colour in this images is false: they’re each monochromatic images rendered with a colour table to make them “interesting”. The LMC is pretty distant & without knowing how long these integrations are, I’d say they’re just stars. We can’t see Jupiter mass objects at 55kpc.
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Re: James Webb telescope launch info

#106  Postby felltoearth » Apr 29, 2022 10:37 am

newolder wrote:Alignment complete for all instruments:
Image
NASA blogpost
...
For this test, Webb pointed at part of the Large Magellanic Cloud, a small satellite galaxy of the Milky Way, providing a dense field of hundreds of thousands of stars across all the observatory’s sensors.
...

It’s full of stars!


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Re: James Webb telescope launch info

#107  Postby hackenslash » Apr 29, 2022 11:11 am

felltoearth wrote:It’s full of stars!


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:mrgreen: :mrgreen: :mrgreen:
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Re: James Webb telescope launch info

#108  Postby newolder » Apr 29, 2022 11:36 am

The "cross" artefact on the MIRI images is additional to the hexagon diffraction limit of the overall telescope and is caused by internal reflections & diffraction in the IR sensor, as explained here and in this paper: The Quantum Efficiency and Diffractive Image Artifacts of Si:As IBC mid-IR Detector Arrays at 5-10 μm: Implications for the JWST/MIRI Detectors
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Re: James Webb telescope launch info

#109  Postby newolder » Apr 30, 2022 7:09 am

Same view from three different IR space telescopes.

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... and remember:

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Re: James Webb telescope launch info

#110  Postby Macdoc » Apr 30, 2022 8:59 am

Holy fuck :what:
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Re: James Webb telescope launch info

#111  Postby TopCat » May 01, 2022 3:46 pm

At risk of tempting fate, how in hell has it been possible to have a project as long and complicated as the JWST be so comprehensively successful?

Knowing what big expensive complicated projects are usually like, this is a genuine question.

And am I right in thinking that literally everything has worked as intended, so far?

Absolutely no bits not working?? :ask:

Amazing. :cheers: :cheers: :clap:
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Re: James Webb telescope launch info

#112  Postby newolder » May 01, 2022 4:00 pm

It has gone very well but not always as planned.

wiki

There were many delays and cost overruns, including a major redesign in 2005, a ripped sunshield during a practice deployment, recommendations from an independent review board, a threat by the U.S. Congress to cancel the project, the COVID-19 pandemic,[8] and problems with the telescope itself.


internet sources...
On September 8, 2021, ESA announced that the official planned launch date is December 18, 2021. On November 22, 2021, NASA announced that the official planned launch date was delayed by four days to December 22, 2021, following a problem encountered when mating JWST to its payload adapter.

NASA said Monday it fixed minor issues on the $10 billion James Webb Space Telescope, with a project manager hoping for a "boring" status. Flight controllers in Maryland reset Webb's solar panel to draw more power and repointed the telescope to restrict sunlight on six overheating motors. 3 Jan 2022


Definitely amazing though. :cheers: :clap:
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Re: James Webb telescope launch info

#113  Postby Macdoc » May 01, 2022 4:29 pm

At risk of tempting fate, how in hell has it been possible to have a project as long and complicated as the JWST be so comprehensively successful?


Look at the Martian rovers ...

Image
The Adventure Twins
Spirit and Opportunity landed on Mars January 3 and January 24, 2004 PST (Jan. 4 and Jan. 25 UTC). Both rovers lived well beyond their planned 90-day missions. Opportunity worked nearly 15 years on Mars and broke the driving record for putting the most miles on the odometer


The Cassini Mission lasting 2 decades
Image
https://solarsystem.nasa.gov/missions/c ... /overview/

I suspect that it's built into NASA DNA to over engineer and that's part of the reason moving "routine projects" have been handed to third party sources.
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Re: James Webb telescope launch info

#114  Postby Spearthrower » May 01, 2022 4:31 pm

newolder wrote:
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Re: James Webb telescope launch info

#115  Postby TopCat » May 01, 2022 6:50 pm

Macdoc wrote:I suspect that it's built into NASA DNA to over engineer

I've been wondering this. Is that since Challenger, the O-ring debacle and the very public investigation that got Feynman involved?

Boeing is now, of course, the poster boy for the Corner Cutting approach to aircraft design, but NASA does seem to have been doing well for quite a while.
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Re: James Webb telescope launch info

#116  Postby Macdoc » May 02, 2022 10:11 am

O-ring was not a specific design flaw - the ship should not have flown in that temperature....the powers were warned and they went ahead.
https://archive.sltrib.com/article.php? ... type=CMSID

Worth watching this again


I concur on Boeing.
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Re: James Webb telescope launch info

#117  Postby TopCat » May 03, 2022 7:43 am

Macdoc wrote:O-ring was not a specific design flaw - the ship should not have flown in that temperature....the powers were warned and they went ahead.

Yes I know. My point was that with many large, complex, expensive projects, it's usual for senior management to get their reputation so invested in appearing to meet the schedule that other things get compromised.

I'm just seriously impressed that that hasn't happened with the JWST.

I'm possibly answering my own question here - having the thing work successfully (or not) would be the single most visible thing about the project, irrespective of when it was delivered. So maybe the senior management understood this from the start and only ever compromised on the schedule when snags arose, not the spec or the quality.

That's an impressive insight in itself, if true, going by the usual quality of senior project management.
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Re: James Webb telescope launch info

#118  Postby Macdoc » May 03, 2022 10:23 am

I think a complicating factor was the rapid advance of technology over two decades and perhaps "added features" growth. I read a good article on the telescope history but can't recall the details. But yep ..marvelous outcome so far. Seems there is multiple redundancy is a feature as well...no space walks with bifocals for this one.
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Re: James Webb telescope launch info

#119  Postby newolder » Jun 01, 2022 3:21 pm

The countdown to first proper images has reached 41 days (July 12th is the release date) and a super-exciting web page has been built to help keep track. :roll:

LIVE COUNTDOWN!
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Re: James Webb telescope launch info

#120  Postby newolder » Jun 09, 2022 12:38 pm

Micrometer impact causes minor damage to mirror ref C3

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