27 Apr 2024, 22:41 [ UTC - 5; DST ]
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Post subject: Re: James Web Telescope Posted: 12 Feb 2022, 13:49 |
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Joined: 12/10/07 Posts: 30849 Post Likes: +10796 Location: Minneapolis, MN (KFCM)
Aircraft: 1970 Baron B55
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Username Protected wrote: CCD cameras also benefit from cooling the sensor. Also shot noise (thermionic emission) is temperature dependent. True. Since they quit using film, most observatory cameras use cyrogenically cooled detectors which allows for much longer exposure times than you could have at room temperature.
_________________ -lance
It's easier to fool people than to convince them that they have been fooled.
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Post subject: Re: James Web Telescope Posted: 16 Mar 2022, 21:03 |
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Joined: 02/08/08 Posts: 5544 Post Likes: +3553 Location: Seattle
Aircraft: A36
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Alignment Milestone, Optics Working Successfully Exciting news. Image here.
_________________ -Bruce bruceair.wordpress.com youtube.com/@BruceAirFlying
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Post subject: Re: James Web Telescope Posted: 17 Mar 2022, 08:19 |
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Joined: 10/03/08 Posts: 3292 Post Likes: +1230 Location: HPN/NY
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Username Protected wrote: I thought that alignment was supposed to take a few months? "Over the next six weeks, the team will proceed through the remaining alignment steps before final science instrument preparations. The team will further align the telescope to include the Near-Infrared Spectrograph, Mid-Infrared Instrument, and Near InfraRed Imager and Slitless Spectrograph. In this phase of the process, an algorithm will evaluate the performance of each instrument and then calculate the final corrections needed to achieve a well-aligned telescope across all science instruments. Following this, Webb’s final alignment step will begin, and the team will adjust any small, residual positioning errors in the mirror segments. The team is on track to conclude all aspects of Optical Telescope Element alignment by early May, if not sooner, before moving on to approximately two months of science instrument preparations. Webb’s first full-resolution imagery and science data will be released in the summer." From the NASA news material posted.
_________________ http://www.scottdyercfi.com
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Post subject: Re: James Web Telescope Posted: 17 Mar 2022, 10:09 |
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Joined: 02/10/12 Posts: 6830 Post Likes: +7944 Company: Minister of Pith Location: Florida
Aircraft: Piper PA28/140
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Username Protected wrote: It works! Hope that's not Starman's headlight.
_________________ "No comment until the time limit is up."
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Post subject: Re: James Web Telescope Posted: 17 Mar 2022, 10:32 |
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Joined: 02/08/08 Posts: 5544 Post Likes: +3553 Location: Seattle
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Take a close look at the large image I linked to earlier ( here). To quote Dave Bowman at the end of 2001: A Space Odyssey, "My god, it's full of stars." In this case, distant galaxies of many types. Although this is a test image, it recalls the famous Hubble deep-field image
_________________ -Bruce bruceair.wordpress.com youtube.com/@BruceAirFlying
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Post subject: Re: James Web Telescope Posted: 17 Mar 2022, 12:25 |
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Joined: 02/08/08 Posts: 5544 Post Likes: +3553 Location: Seattle
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From a BBC story: Quote: The "spike" structures were a function of the design of Webb's primary mirror, explained Mark McCaughrean from the European Space Agency (Esa).
"The shape of those 18 hexagons imprints a faint diffraction pattern that makes bright stars look like spiky snowflakes - this isn't a problem for the science, but will give Webb images a very distinctive look," he told BBC News.
"Indeed, the fact that we can see those spikes so crisply also confirms that the mirrors have been perfectly lined up - this is brilliant news."
_________________ -Bruce bruceair.wordpress.com youtube.com/@BruceAirFlying
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Post subject: Re: James Web Telescope Posted: 17 Mar 2022, 12:29 |
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Joined: 05/11/10 Posts: 9337 Post Likes: +12120 Company: ? Most always. I like people. Location: KFIN Flagler, FL
Aircraft: 1991 Bonanza A36
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Username Protected wrote: From a BBC story: Quote: The "spike" structures were a function of the design of Webb's primary mirror, explained Mark McCaughrean from the European Space Agency (Esa).
"The shape of those 18 hexagons imprints a faint diffraction pattern that makes bright stars look like spiky snowflakes - this isn't a problem for the science, but will give Webb images a very distinctive look," he told BBC News.
"Indeed, the fact that we can see those spikes so crisply also confirms that the mirrors have been perfectly lined up - this is brilliant news." Wooh... Thank goodness. When I saw those spiky things I thought surely we were going to have to put a mask on the telescope...
_________________ Bible In Poems BibleInPoems.com BNice
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Post subject: Re: James Web Telescope Posted: 17 Mar 2022, 14:06 |
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Joined: 04/26/13 Posts: 19981 Post Likes: +19741 Location: Columbus , IN (KBAK)
Aircraft: 1968 Baron D55
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Username Protected wrote: From a BBC story: Quote: The "spike" structures were a function of the design of Webb's primary mirror, explained Mark McCaughrean from the European Space Agency (Esa).
"The shape of those 18 hexagons imprints a faint diffraction pattern that makes bright stars look like spiky snowflakes - this isn't a problem for the science, but will give Webb images a very distinctive look," he told BBC News.
"Indeed, the fact that we can see those spikes so crisply also confirms that the mirrors have been perfectly lined up - this is brilliant news." So it's blurry by design.
_________________ My last name rhymes with 'geese'.
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Post subject: Re: James Web Telescope Posted: 17 Mar 2022, 21:05 |
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Joined: 01/06/08 Posts: 4702 Post Likes: +2705
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Almost certainly something in the optics or CCD - maybe still to be tuned out by additional alignment. Black holes are too small to see with an optical telescope. There was sort of an image of a black hole using an array of radio telescopes that spanned the whole globe - and its just barely detectable with lots of processing. (the dark spot is still quite a bit larger than teh actual black hole but is a result of how it bends light) https://eventhorizontelescope.org/Username Protected wrote: so I zoomed in on that initial picture. it is captivating.
if you looks closely, you can see a few "rings of light." i.e., a black dot with a ring of starlight around it. could these be black holes, or is this an optical phenomenon?
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