The James Webb Space Telescope

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Profile Julie
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Message 1559330 - Posted: 20 Aug 2014, 7:59:45 UTC

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.



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Message 1565774 - Posted: 1 Sep 2014, 18:14:57 UTC

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.
Access into a clean room to get a close-up view of a complicated, high-value scientific instrument is carefully controlled, but NASA photographers get such exclusive entry all the time. Photographer Chris Gunn took this image of the NIRSpec instrument inside the giant cleanroom at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
The Near-Infrared Spectrograph or NIRSpec is a multi-object spectrograph, which is a tool for observing many objects in the cosmos simultaneously. The NIRSpec takes in light from around 100 distant objects and records their spectra (band of colors produced when sunlight is passed through a prism), separating the light into its components using prisms and other optical devices.
The NIRSpec will join three other Webb science instruments that will be mounted on the Integrated Science Instrument Module (ISIM). The ISIM structure is like the frame of a in a car providing support for the engine and other components.
In the photo, the NIRSpec is the large silver mass on the right-hand side. The silver frame-like object on the left side is part of the ISIM structure.


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Message 1565817 - Posted: 1 Sep 2014, 19:14:55 UTC

Must be pretty special cooking foil!
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Message 1565821 - Posted: 1 Sep 2014, 19:20:34 UTC - in response to Message 1565817.  

Must be pretty special cooking foil!


+1!
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Message 1571419 - Posted: 13 Sep 2014, 13:03:13 UTC

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.
Eighteen hexagonal polished metal segments that together comprise the largest mirror on the Webb telescope will rest on the backplane.
This is the center section of the actual backplane that will fly on the Webb telescope. The backplane also has two "wings" or other sections that attach to each side. The photograph was taken at Northrop Grumman's clean room in Redondo Beach, California.
The Webb's giant mirrors will collect light from galaxies farther away and further back in time than ever seen before.


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Message 1571993 - Posted: 14 Sep 2014, 22:11:32 UTC

The Webb telescope or any infrared telescope; can they recast their images so they will appear as regular visible wavelength images? I imagine that they couldn't completely do that. Some images would just be missing too much info but would it be close?
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Message 1572084 - Posted: 15 Sep 2014, 5:24:57 UTC

It is normal to re-map an IR (or indeed any other non-visible EM radiation) image into the visible part of the spectrum - it is easier for us humans to see what is going on when looking at a picture than looking at the data as a load of numbers...
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Message 1572118 - Posted: 15 Sep 2014, 7:11:34 UTC - in response to Message 1572084.  

Will they be the beautiful pictures that we see from Hubble?
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Message 1572159 - Posted: 15 Sep 2014, 10:33:49 UTC - in response to Message 1572118.  

Will they be the beautiful pictures that we see from Hubble?



Even better is my guess:) The JWST is much more sophisticated than the Hubble.
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Message 1572257 - Posted: 15 Sep 2014, 17:25:54 UTC

Many of the most spectacular pictures from Hubble are composites of false-colour IR plus visible, or enhanced colour visible so there is no reason not to expect the same technologies to be applied, but given the greater resolution of the JWT with even greater visual effect.
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Message 1582601 - Posted: 6 Oct 2014, 16:32:19 UTC

James Webb Space Telescope Sunshield Test Unfolds Seamlessly

The sunshield separates the observatory into a warm, sun-facing side (reaching temperatures close to 400 degrees Farenheit), and a cold side (185 degrees below zero) where the sunlight is blocked from interfering with the sensitive telescope instruments. It provides the instruments with an effective sun protection factor, or SPF, of one million.
The sunshield’s membrane layers, each as thin as a human hair, are made of Kapton, a tough, high-performance plastic coated with a reflective metal. On orbit, the observatory will be pointed so that the sun, Earth and moon are always on one side, with the sunshield acting as an umbrella to shade the telescope mirrors and instruments from the warmer spacecraft electronics and the sun.


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Message 1582724 - Posted: 6 Oct 2014, 20:56:46 UTC - in response to Message 1582601.  

+++
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Message 1590709 - Posted: 23 Oct 2014, 14:07:04 UTC

James Webb Space Telescope's Heart Survives Deep Freeze Test

Part II

After 116 days of being subjected to extremely frigid temperatures like that in space, the heart of the James Webb Space Telescope, the Integrated Science Instrument Module (ISIM) and its sensitive instruments, emerged unscathed from the thermal vacuum chamber at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
The Webb telescope's images will reveal the first galaxies forming 13.5 billion years ago. The telescope will also pierce through interstellar dust clouds to capture stars and planets forming in our own galaxy. At the telescope's final destination in space, one million miles away from Earth, it will operate at incredibly cold temperatures of -387 degrees Fahrenheit, or 40 degrees Kelvin. This is 260 degrees Fahrenheit colder than any place on the Earth’s surface has ever been. To create temperatures that cold on Earth, the team uses the massive thermal vacuum chamber at Goddard called the Space Environment Simulator, or SES, that duplicates the vacuum and extreme temperatures of space. This 40-foot-tall, 27-foot-diameter cylindrical chamber eliminates the tiniest trace of air with vacuum pumps and uses liquid nitrogen and even colder liquid helium to drop the temperature simulating the space environment.


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Message 1593941 - Posted: 29 Oct 2014, 18:54:19 UTC

Webb Telescope Mirrors: Stepping Stones to the Cosmos


Scientists and engineers placed two NASA James Webb Space Telescope test primary mirror segments onto the support structure that will hold them, where they resemble stepping stones, as seen in this photo.
There are four types of mirrors that will fly aboard NASA's James Webb Space Telescope: The primary, secondary, tertiary and fine steering mirrors.
Together they will direct light into sensitive instruments, like stepping stones towards new discoveries about the cosmos.
Highly trained engineers and technicians from NASA, Exelis, and Northrop Grumman lifted the two test primary mirror segments in the photograph onto the support structure, working in a giant clean room at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
Both mirrors are made from beryllium. These primary mirror "test" segments are also flight spares. One of the mirrors is coated with a microscopically fine film of gold just like the actual flight mirrors, while the other is not. For the testing these mirrors will undergo, it is not critical that they all be gold-coated. The gold coating will enable the mirrors to most efficiently reflect the infrared light from distant galaxies.


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Message 1594305 - Posted: 30 Oct 2014, 10:54:18 UTC - in response to Message 1593941.  

Very nice,
Thanks Julie
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Message 1594323 - Posted: 30 Oct 2014, 11:49:26 UTC

Welcome Merle:)
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Message 1597763 - Posted: 6 Nov 2014, 18:33:52 UTC

NASA's Webb Telescope Pathfinder Telescope Fully Assembled

Inside a giant clean room at NASA's Goddard Space Flight Center in Greenbelt, Maryland, the pathfinder telescope, a practice section of the James Webb Space Telescope, stands fully assembled. Teams of engineers built and aligned the pathfinder telescope to rehearse assembly and testing before the actual telescope is built. After the team installs the test sensors and completes their final close out, the pathfinder telescope will be shipped to NASA's Johnson Space Center in Houston, Texas for cryo-optical testing.



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Message 1601054 - Posted: 14 Nov 2014, 12:14:59 UTC - in response to Message 1549489.  

All three? OK.


U mean ALL 5 of lagrange points...YES!

And only 2 are stable enough, so those 2 are able to have JWST in it! ;)

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Message 1601061 - Posted: 14 Nov 2014, 12:43:12 UTC - in response to Message 1551957.  

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.


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.

the atricles just say it's Hubble size telescopes...not that they ARE Hubble copies... :/

thanks for the links, but don't troll.

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Message 1609141 - Posted: 4 Dec 2014, 17:49:19 UTC

NASA's Webb Telescope ISIM Gets Cubed for Gravity Test


The James Webb Space Telescope's ISIM structure recently endured a "gravity sag test" as it was rotated in what looked like giant cube in a NASA clean room.
The Integrated Science Instrument Module (ISIM) that will fly on the Webb telescope was rotated upside down inside a cube-like structure in the cleanroom at NASA's Goddard Space Flight Center in Greenbelt, Maryland. The purpose of "cubing" the ISIM was to test it for "gravity sag," which is to see how much the structure changes under its own weight due to gravity.


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Message boards : Science (non-SETI) : The James Webb Space Telescope


 
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