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Equipment Discussions >> Equipment

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Alan S
professor emeritus


Reged: 10/27/07

Giant Magellan Telescope
      #6043464 - 08/24/13 12:03 PM

Not sure what forum to post this in, but it is equipment...just not a piece any of us will be observing with!

The 3rd off-axis mirror for the GMT is being cast as I type this. I have posted some pictures of the mirror as the glass melts on my blog The Lost Pleiad Observatory and I'll try to keep updating the pics later today as the process unfolds.


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HowardK
Pooh-Bah
*****

Reged: 10/20/10

Re: Giant Magellan Telescope new [Re: Alan S]
      #6043622 - 08/24/13 01:29 PM

Woh

They have cameras in the oven!


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Alan S
professor emeritus


Reged: 10/27/07

Re: Giant Magellan Telescope new [Re: HowardK]
      #6043658 - 08/24/13 01:48 PM

Yes!

In the days before they were able to so effectively monitor the process through "remote" cameras and sensors, they paid graduate students to ride on top of the oven (think merry-go-round) and monitor the systems.

It is truly remarkable.


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careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Giant Magellan Telescope new [Re: Alan S]
      #6043913 - 08/24/13 04:49 PM

Consider that each one of these 7 mirrors is larger than the Hale Telescope or the Bolshoi Telescope, and would have made it the largest telescope in the world 20 years ago, and matches the largest unitary mirror ever made thus far (the two in the Large Binocular Telescope).

Now we all want a cellular spin-cast mirror! (I will settle for a 40-incher though.)


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Alan S
professor emeritus


Reged: 10/27/07

Re: Giant Magellan Telescope new [Re: careysub]
      #6044008 - 08/24/13 05:53 PM

Yes, and they also match the 8.4 meter LSST mirror which is currently being polished at the mirror lab. The LSST mirror is F/1.2 (you read that right) and has 2 surfaces, with differing curvatures. A primary and a tertiary surface on the same piece of glass.

Anyone visiting Tucsn owes it to themselves to take the mirror lab tour.

Alan


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David PavlichAdministrator
Transmographied
*****

Reged: 05/18/05

Loc: Mandeville, LA USA
Re: Giant Magellan Telescope new [Re: Alan S]
      #6044337 - 08/24/13 10:23 PM

The big telescopes fascinate me! The engineering involved to actually make them function is amazing. Thanks for posting.

David


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jmandell
sage


Reged: 06/15/11

Re: Giant Magellan Telescope new [Re: Alan S]
      #6044366 - 08/24/13 10:51 PM Attachment (29 downloads)

Quote:

Yes, and they also match the 8.4 meter LSST mirror which is currently being polished at the mirror lab. The LSST mirror is F/1.2 (you read that right) and has 2 surfaces, with differing curvatures. A primary and a tertiary surface on the same piece of glass.

Anyone visiting Tucsn owes it to themselves to take the mirror lab tour.

Alan




Here's a photo I took while I was at the mirror lab during the U of A's teen astronomy camp back in June:

(I hope you don't mind me posting it here)

Edited by jmandell (08/24/13 10:55 PM)


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Alan S
professor emeritus


Reged: 10/27/07

Re: Giant Magellan Telescope new [Re: jmandell]
      #6044564 - 08/25/13 01:51 AM

Great shot of the LSST mirror! You can see that both surfaces are being simultaneously polished...and if I recall correctly, that was technology that had to be developed specifically for this mirror.

Its great that the teen camp went through there...today's teens are tomorrows astronomers and will be using these telescopes once they are on-line.

Clear skies


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careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Giant Magellan Telescope new [Re: Alan S]
      #6046625 - 08/26/13 09:42 AM

Quote:

...
Anyone visiting Tucson owes it to themselves to take the mirror lab tour.

Alan




Thanks for that suggestion!

I will have to add that to my "bouquet list" (sounds better than "bucket list").


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careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Giant Magellan Telescope new [Re: David Pavlich]
      #6046694 - 08/26/13 10:26 AM

I was 9 years old when I read an account of the casting of the Hale Telescope mirror, and remembered the details vividly ever since.

I have since toured the Palomar Observatory, and seen the molding block from the first failed casting on display at Griffith Observatory. Don't know if I will ever get around to seeing the Corning exhibit in New York.


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jmandell
sage


Reged: 06/15/11

Re: Giant Magellan Telescope new [Re: Alan S]
      #6047587 - 08/26/13 07:43 PM Attachment (10 downloads)

Quote:

Great shot of the LSST mirror! You can see that both surfaces are being simultaneously polished...and if I recall correctly, that was technology that had to be developed specifically for this mirror.

Its great that the teen camp went through there...today's teens are tomorrows astronomers and will be using these telescopes once they are on-line.

Clear skies




It was a truly amazing place to see! All the new projects that are going on are very exciting, and I look forward to seeing the data they produce (especially the GMT )

We also got to see one of the Mirror lab's greatest successes (the Large Binocular Telescope):

Edited by jmandell (08/26/13 07:47 PM)


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davidpitre
Post Laureate
*****

Reged: 05/10/05

Loc: Central Texas
Re: Giant Magellan Telescope new [Re: jmandell]
      #6048463 - 08/27/13 09:38 AM

Alan. That is amazing. Please do keep posting about the progress.

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