The James Webb Space Telescope

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

To post messages, you must log in.

Previous · 1 · 2 · 3 · 4 · 5 · 6 . . . 8 · Next

AuthorMessage
Profile Chris SCrowdfunding Project Donor
Volunteer tester
Avatar

Send message
Joined: 19 Nov 00
Posts: 40037
Credit: 34,781,337
RAC: 63,841
United Kingdom
Message 1549394 - Posted: 29 Jul 2014, 11:02:38 UTC

We could have had repair missions if they hadn't scrapped the Shuttles far too early!
ID: 1549394 · Report as offensive
Profile tullioProject Donor
Volunteer moderator
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 6296
Credit: 1,677,119
RAC: 1,359
Italy
Message 1549413 - Posted: 29 Jul 2014, 12:41:49 UTC - in response to Message 1549394.  

No, they could not reach a Lagrange point where JWST is headed.
Tullio
ID: 1549413 · Report as offensive
Profile Chris SCrowdfunding Project Donor
Volunteer tester
Avatar

Send message
Joined: 19 Nov 00
Posts: 40037
Credit: 34,781,337
RAC: 63,841
United Kingdom
Message 1549489 - Posted: 29 Jul 2014, 15:05:49 UTC

All three? OK.
ID: 1549489 · Report as offensive
Darth Beaver
Avatar

Send message
Joined: 20 Aug 99
Posts: 6606
Credit: 19,554,589
RAC: 5,281
Australia
Message 1549492 - Posted: 29 Jul 2014, 15:14:12 UTC - in response to Message 1549489.  

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 ....

ID: 1549492 · Report as offensive
Profile tullioProject Donor
Volunteer moderator
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 6296
Credit: 1,677,119
RAC: 1,359
Italy
Message 1549538 - Posted: 29 Jul 2014, 16:50:58 UTC - in response to Message 1549492.  

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
ID: 1549538 · Report as offensive
Darth Beaver
Avatar

Send message
Joined: 20 Aug 99
Posts: 6606
Credit: 19,554,589
RAC: 5,281
Australia
Message 1549612 - Posted: 29 Jul 2014, 23:18:57 UTC - in response to Message 1549538.  

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 ...

ID: 1549612 · Report as offensive
Profile tullioProject Donor
Volunteer moderator
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 6296
Credit: 1,677,119
RAC: 1,359
Italy
Message 1549693 - Posted: 30 Jul 2014, 4:26:01 UTC - in response to Message 1549612.  

I think it is still used in a low resolution capability. It can be cool out there in space.
Tullio
ID: 1549693 · Report as offensive
Darth Beaver
Avatar

Send message
Joined: 20 Aug 99
Posts: 6606
Credit: 19,554,589
RAC: 5,281
Australia
Message 1549769 - Posted: 30 Jul 2014, 9:38:17 UTC

Yep Tullio -178 c is cold alright you would think that would be cold enough but nada

ID: 1549769 · Report as offensive
Profile KC5VDJ - Jim the Enchanter
Avatar

Send message
Joined: 17 May 99
Posts: 81
Credit: 4,083,597
RAC: 0
United States
Message 1551649 - Posted: 2 Aug 2014, 23:33:16 UTC - in response to Message 1450767.  

Thanks for the link Julie.
I will miss Hubble :(


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

ID: 1551649 · Report as offensive
Profile betregerProject Donor
Avatar

Send message
Joined: 29 Jun 99
Posts: 6428
Credit: 15,520,440
RAC: 10,099
United States
Message 1551667 - Posted: 3 Aug 2014, 0:09:11 UTC - in response to Message 1551649.  

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.
ID: 1551667 · Report as offensive
Profile tullioProject Donor
Volunteer moderator
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 6296
Credit: 1,677,119
RAC: 1,359
Italy
Message 1551765 - Posted: 3 Aug 2014, 8:25:10 UTC - in response to Message 1551667.  
Last modified: 3 Aug 2014, 8:25:41 UTC

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
ID: 1551765 · Report as offensive
Profile KC5VDJ - Jim the Enchanter
Avatar

Send message
Joined: 17 May 99
Posts: 81
Credit: 4,083,597
RAC: 0
United States
Message 1551957 - Posted: 3 Aug 2014, 20:44:52 UTC - in response to Message 1551667.  
Last modified: 3 Aug 2014, 20:47:54 UTC

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.
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

ID: 1551957 · Report as offensive
Profile Chris SCrowdfunding Project Donor
Volunteer tester
Avatar

Send message
Joined: 19 Nov 00
Posts: 40037
Credit: 34,781,337
RAC: 63,841
United Kingdom
Message 1551962 - Posted: 3 Aug 2014, 21:00:20 UTC

The National Reconnaissance Office, America's intelligence agency for space-based surveillance, has donated two, partially-completed space telescopes to NASA. According to Paul Hertz, the telescopes are currently sitting quietly in a clean room at ITT Exelis in Rochester, New York.

MOL

Ooooh conspiracies everywhere ....
ID: 1551962 · Report as offensive
Profile betregerProject Donor
Avatar

Send message
Joined: 29 Jun 99
Posts: 6428
Credit: 15,520,440
RAC: 10,099
United States
Message 1551964 - Posted: 3 Aug 2014, 21:06:04 UTC - in response to Message 1551957.  

Thanx
ID: 1551964 · Report as offensive
Profile Julie
Volunteer moderator
Volunteer tester
Avatar

Send message
Joined: 28 Oct 09
Posts: 33496
Credit: 12,344,595
RAC: 10,687
Belgium
Message 1553808 - Posted: 8 Aug 2014, 19:31:52 UTC

Thanx for the links Jim, most interesting:)
rOZZ
Music
Pictures
ID: 1553808 · Report as offensive
Profile Gary CharpentierCrowdfunding Project Donor
Volunteer tester
Avatar

Send message
Joined: 25 Dec 00
Posts: 21099
Credit: 30,565,779
RAC: 21,851
United States
Message 1554075 - Posted: 9 Aug 2014, 2:36:14 UTC - in response to Message 1551765.  

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

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.
ID: 1554075 · Report as offensive
Profile Julie
Volunteer moderator
Volunteer tester
Avatar

Send message
Joined: 28 Oct 09
Posts: 33496
Credit: 12,344,595
RAC: 10,687
Belgium
Message 1555203 - Posted: 11 Aug 2014, 18:50:24 UTC

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.
Assembled on four postage-size grids or arrays, the 250,000 shutters open or close individually to allow only the light from targeted objects to enter Webb’s Near Infrared Spectrograph (NIRSpec), which will help identify types of stars and gases and measure their distances and motions. Because Webb will observe faint, far-away objects, it will take as long as a week for NIRSpec to gather enough light to obtain good spectra.
NIRSpec’s microshutter array, however, enhances the instrument’s observing efficiencies. It will allow scientists to gather spectral data on 100 objects at a time, vastly increasing the observatory’s productivity. When NASA launches the Webb telescope in 2018, it will represent a first for multi-object spectroscopy.

rOZZ
Music
Pictures
ID: 1555203 · Report as offensive
Profile Julie
Volunteer moderator
Volunteer tester
Avatar

Send message
Joined: 28 Oct 09
Posts: 33496
Credit: 12,344,595
RAC: 10,687
Belgium
Message 1556659 - Posted: 14 Aug 2014, 9:48:29 UTC

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.
The pathfinder, a non-flight replica of the Webb telescope’s center backplane was assembled and tested at Northrop Grumman in Redondo Beach, California. The actual flight backplane comes in three segments, a main part and two wing-like parts, all of which will support large hexagonal mirrors on the Webb telescope. The pathfinder only consists of the center part of the backplane.



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
ID: 1556659 · Report as offensive
anniet
Volunteer tester

Send message
Joined: 2 Feb 14
Posts: 6747
Credit: 1,084,731
RAC: 547
Message 1557213 - Posted: 15 Aug 2014, 7:51:14 UTC

Thanks for the update Julie :) it's hard waiting though... I really need to pace my excitement on these long term things :)
ID: 1557213 · Report as offensive
Profile Julie
Volunteer moderator
Volunteer tester
Avatar

Send message
Joined: 28 Oct 09
Posts: 33496
Credit: 12,344,595
RAC: 10,687
Belgium
Message 1557721 - Posted: 16 Aug 2014, 7:54:27 UTC

I really need to pace my excitement on these long term things :)


It's a good exercise for our patience Annie:) (patience=>not my strongest side....)
rOZZ
Music
Pictures
ID: 1557721 · Report as offensive
Previous · 1 · 2 · 3 · 4 · 5 · 6 . . . 8 · Next

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


 
©2017 University of California
 
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.