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The James Webb Space Telescope
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Darth Beaver Send message Joined: 20 Aug 99 Posts: 6728 Credit: 21,443,075 RAC: 3 |
isn't Chandra in the same boat to far out to refuel the cryogenic system and why it's nearly kaput ? running out of the coolant .... |
tullio Send message Joined: 9 Apr 04 Posts: 8797 Credit: 2,930,782 RAC: 1 |
An X-ray telescope should not need any coolant. An infrared like Spitzer yes. I believe JWST operates in near infrared but I don't think it needs a coolant. The Lagrange points are used to be far from the Earth and the radiation it emits. Tullio |
Darth Beaver Send message Joined: 20 Aug 99 Posts: 6728 Credit: 21,443,075 RAC: 3 |
I'm not shore which one it is but i thought they had to cool it down to almost absolute zero to be able to see the background signal you could be right about it being spitzer , but i m shore i read it will run out of coolent so it will be useless and it's to far away to refuel ... |
tullio Send message Joined: 9 Apr 04 Posts: 8797 Credit: 2,930,782 RAC: 1 |
I think it is still used in a low resolution capability. It can be cool out there in space. Tullio |
Darth Beaver Send message Joined: 20 Aug 99 Posts: 6728 Credit: 21,443,075 RAC: 3 |
Yep Tullio -178 c is cold alright you would think that would be cold enough but nada |
KC5VDJ - Jim the Enchanter Send message Joined: 17 May 99 Posts: 81 Credit: 4,083,597 RAC: 0 |
Thanks for the link Julie. Whatcha talkin 'bout Willis?! There are THREE Hubbles, and they are still up there, and operational. Two of them were pointing down instead of up, and NRO handed them off to NASA two years ago after admitting they exist. This probably means a Webb type scope is already in orbit. Why would NRO give up their Hubbles otherwise? Delidded i7-4790K (CLU/CLU) at 4.7GHz @ 1.310Vcore 24/7, 32GB DDR3-2400, Corsair H100i v2, Gigabyte Z97X-Gaming G1 WIFI-BK, MSI Radeon RX 480 Gaming 4G, HX-650 PSU, Corsair 750D |
betreger Send message Joined: 29 Jun 99 Posts: 11416 Credit: 29,581,041 RAC: 66 |
There are THREE Hubbles, and they are still up there, and operational. Two of them were pointing down instead of up, and NRO handed them off to NASA two years ago after admitting they exist. Documentation? If true I missed that one. |
tullio Send message Joined: 9 Apr 04 Posts: 8797 Credit: 2,930,782 RAC: 1 |
I think they are still on the ground. NRO wanted to donate them to NASA but NASA does not have the money to convert them to astronomical observations. The JWST has a much bigger multimirror. Tullio |
KC5VDJ - Jim the Enchanter Send message Joined: 17 May 99 Posts: 81 Credit: 4,083,597 RAC: 0 |
There are THREE Hubbles, and they are still up there, and operational. Two of them were pointing down instead of up, and NRO handed them off to NASA two years ago after admitting they exist. http://www.washingtonpost.com/national/health-science/nasa-gets-military-spy-telescopes-for-astronomy/2012/06/04/gJQAsT6UDV_story.html http://nasawatch.com/archives/2012/06/nro-gives-nasa.html http://www.redorbit.com/news/space/1112548083/nro-gives-nasa-two-hubble-sized-telescopes/ http://www.space.com/20955-nasa-spy-satellite-telescopes-missions.html http://www.americaspace.com/?p=20825 http://www.planetary.org/blogs/guest-blogs/jason-davis/nasa-gets-two-hand-me-down.html The last link at The Planetary Society, surmizes that these are actually two more that were part of the Keyhole program, which currently has 15 birds in orbit, probably of this type. Oh, and I guess my wetware had a glitch. These two have never been launched. Still in cold storage. I'm sure you can find more links. Delidded i7-4790K (CLU/CLU) at 4.7GHz @ 1.310Vcore 24/7, 32GB DDR3-2400, Corsair H100i v2, Gigabyte Z97X-Gaming G1 WIFI-BK, MSI Radeon RX 480 Gaming 4G, HX-650 PSU, Corsair 750D |
betreger Send message Joined: 29 Jun 99 Posts: 11416 Credit: 29,581,041 RAC: 66 |
Thanx |
Julie Send message Joined: 28 Oct 09 Posts: 34060 Credit: 18,883,157 RAC: 18 |
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Gary Charpentier Send message Joined: 25 Dec 00 Posts: 31012 Credit: 53,134,872 RAC: 32 |
I think they are still on the ground. NRO wanted to donate them to NASA but NASA does not have the money to convert them to astronomical observations. The JWST has a much bigger multimirror. Talked to a friend, who says the scuttlebutt around JPL is there are two replacements for Hubble in the works. That likely means they are shopping around for proposals for the detection equipment to attach to the already built mirror and what they should be pointing it at once in orbit. Don't know if the mirror spec is for UV, Optical or IR. I'm sure it has been in storage long enough that they will have to recoat it anyway. |
Julie Send message Joined: 28 Oct 09 Posts: 34060 Credit: 18,883,157 RAC: 18 |
Revolutionary Microshutter Technology Hurdles Significant Challenges Considered among the most innovative technologies to fly on the Webb telescope, the microshutter assembly is created from micro-electro-mechanical technologies and comprises thousands of tiny shutters, each about the width of a human hair. rOZZ Music Pictures |
Julie Send message Joined: 28 Oct 09 Posts: 34060 Credit: 18,883,157 RAC: 18 |
Update: James Webb Space Telescope "Pathfinder" Backplane's Path to NASA The “central backbone†of NASA's James Webb Space Telescope practice-model recently took a cross-country trip to be part of a simulation of putting together vital parts of the telescope. The pathfinder recently traveled a path across the country from California to Maryland. James Webb Space Telescope pathfinder backplane in the cleanroom The center section of the "pathfinder" (test) backplane of NASA's James Webb Space Telescope arrived at the Goddard Space Flight Center in July 2014, to be part of a simulation of putting together vital parts of the telescope. In this photograph, the backplane is hoisted into place in the assembly stand in NASA Goddard's giant cleanroom, where over the next several months engineers and scientists will install two spare primary mirror segments and a spare secondary mirror. By installing the mirrors on the replica, technicians are able to practice this delicate procedure for when the actual flight backplane arrives. Installation of the mirrors on the backplane requires precision, so practice is important. Click links to watch the pictures. rOZZ Music Pictures |
anniet Send message Joined: 2 Feb 14 Posts: 7105 Credit: 1,577,368 RAC: 75 |
Thanks for the update Julie :) it's hard waiting though... I really need to pace my excitement on these long term things :) |
Julie Send message Joined: 28 Oct 09 Posts: 34060 Credit: 18,883,157 RAC: 18 |
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Julie Send message Joined: 28 Oct 09 Posts: 34060 Credit: 18,883,157 RAC: 18 |
Making Room for Webb's Mirrors Engineers inside the world's largest clean room at NASA's Goddard Space Flight Center in Greenbelt, Maryland are working on the engineering test unit or "Pathfinder," for the James Webb Space Telescope. Webb’s Pathfinder acts as a spine supporting the telescope primary mirror segments. The Pathfinder is a non-flight prototype. To install the mirrors onto the center structure, the pathfinder must be first be over-deployed, that means engineers must secure two of the struts against the wall so they have plenty of room to work. Click link to view the pic rOZZ Music Pictures |
Julie Send message Joined: 28 Oct 09 Posts: 34060 Credit: 18,883,157 RAC: 18 |
A "NIRSpec-tacular View" of NASA's Webb Telescope Instrument A NASA photographer recently captured a "NIRSpec-tacular" photo of an instrument that will fly aboard NASA's James Webb Space Telescope when it launches in 2018. Click link to watch the photo. rOZZ Music Pictures |
Julie Send message Joined: 28 Oct 09 Posts: 34060 Credit: 18,883,157 RAC: 18 |
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Julie Send message Joined: 28 Oct 09 Posts: 34060 Credit: 18,883,157 RAC: 18 |
NASA Engineers Conduct Low Light Test on New Technology for Webb Telescope NASA engineers inspect a new piece of technology developed for the James Webb Space Telescope, the micro shutter array, with a low light test at NASA's Goddard Space Flight Center in Greenbelt, Maryland. Developed at Goddard to allow Webb's Near Infrared Spectrograph to obtain spectra of more than 100 objects in the universe simultaneously, the micro shutter array uses thousands of tiny shutters to capture spectra from selected objects of interest in space and block out light from all other sources. James Webb Space Telescope's "Mirror Mattress" The backplane of NASA's James Webb Space Telescope looks like the springs in a mattress. In this photo, you see the central part of the three-part backplane, tilted to its side, much like a mattress being carried. Click links to watch the photos rOZZ Music Pictures |
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