ICEINSPACE
Most Read Articles
Moon Phase
CURRENT MOON Waning Gibbous
98.3%
The Sun Now
Time Zones
Sydney
7:46 pm
Perth
5:46 pm
Auckland
9:46 pm
New York*
5:46 am
Paris*
11:46 am
GMT
9:46 am




Go Back   IceInSpace > General Astronomy > Astronomy and Amateur Science

Reply
 
Thread Tools Rate Thread
  #1  
Old 08-01-2018, 04:30 PM
gary
Registered User

gary is offline
 
Join Date: Apr 2005
Location: Mt. Kuring-Gai
Posts: 4,832
Mirror casting for the Giant Magellan Telescope (GMT)

In a 6 Jan 2018 article at ieee.org, Celia Gorman reports on the casting
of the seven mirrors for the Giant Magellan Telescope (GMT) at the
University of Arizona.

The work takes decades and the first mirror was cast back in 2005.

Each mirror cost US$20 million and takes more than two years to make.

Story and video here :-
https://spectrum.ieee.org/video/aero...gest-telescope
Reply With Quote
  #2  
Old 08-01-2018, 04:46 PM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 16,627
Very cool. I wonder if the ESO one will be partly operational by then as it is more modular.
Reply With Quote
  #3  
Old 08-01-2018, 10:09 PM
xelasnave's Avatar
xelasnave
Gravity does not Suck

xelasnave is online now
 
Join Date: Mar 2005
Location: Tabulam
Posts: 10,451
Wow the price.
Thanks Gary.
So I thought how to build a big scope cheap.
A saterlite made from a shaped ballon a coating if reflective mirror stuff cover with fibre glass ...remove the ballon and there is you primary mirror.
A wonky surface but you make it a diameter of 500 feet an a long focal length by a sat following with the camera ...gear to keep them lined up.
Then softeware to correct anomolies by averaging the image from the little less than perfect mirror surface.
All you have get up there is a ballon something to fill it mirroring and fibre glass..well carbon fibre.
ALEX
Reply With Quote
  #4  
Old 09-01-2018, 05:50 AM
skysurfer's Avatar
skysurfer
Dark sky rules !

skysurfer is offline
 
Join Date: Dec 2011
Location: 52N 6E (EU)
Posts: 896
Well, seven single 8m mirrors making a 24m composite mirror are much more difficult than 984 1.4m hexagonal segments making a 39m composite main mirror which makes the E-ELT on Cerro Armazones, Chile.
Reply With Quote
  #5  
Old 10-01-2018, 07:48 AM
multiweb's Avatar
multiweb (Marc)
ze frogginator

multiweb is offline
 
Join Date: Oct 2007
Location: Hinchinbrook
Posts: 16,627
Right on time.





That little video with the forklift carrying one element of a 39m diameter total array just shows how clever the concept of a modular system is. Transport logistics won't be as daunting as the Arizona project. Hopefully it performs as well optically.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 07:46 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Advertisement
Interest Free Finance
Advertisement
Lunatico Astronomical
Advertisement
SkyWatcher WiFi Adaptor
Advertisement
Atik Horizon
Advertisement
FLI Cameras and Imaging Accessories
Advertisement
NexDome Observatories
Advertisement
Bintel
Advertisement
OzScopes Authorised Dealer
Advertisement
SkyWatcher 2018 Catalogue
Advertisement
Astronomy and Electronics Centre
Advertisement