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Proceedings Paper

Giant Magellan Telescope: overview
Author(s): Matt Johns; Patrick McCarthy; Keith Raybould; Antonin Bouchez; Arash Farahani; Jose Filgueira; George Jacoby; Steve Shectman; Michael Sheehan
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Paper Abstract

The Giant Magellan Telescope (GMT) is a 25-meter optical/infrared extremely large telescope that is being built by an international consortium of universities and research institutions. It will be located at the Las Campanas Observatory, Chile. The GMT primary mirror consists of seven 8.4-m borosilicate honeycomb mirror segments made at the Steward Observatory Mirror Lab (SOML). Six identical off-axis segments and one on-axis segment are arranged on a single nearly-paraboloidal parent surface having an overall focal ratio of f/0.7. The fabrication, testing and verification procedures required to produce the closely-matched off-axis mirror segments were developed during the production of the first mirror. Production of the second and third off-axis segments is underway. GMT incorporates a seven-segment Gregorian adaptive secondary to implement three modes of adaptive-optics operation: natural-guide star AO, laser-tomography AO, and ground-layer AO. A wide-field corrector/ADC is available for use in seeing-limited mode over a 20-arcmin diameter field of view. Up to seven instruments can be mounted simultaneously on the telescope in a large Gregorian Instrument Rotator. Conceptual design studies were completed for six AO and seeing-limited instruments, plus a multi-object fiber feed, and a roadmap for phased deployment of the GMT instrument suite is being developed. The partner institutions have made firm commitments for approximately 45% of the funds required to build the telescope. Project Office efforts are currently focused on advancing the telescope and enclosure design in preparation for subsystem- and system-level preliminary design reviews which are scheduled to be completed in the first half of 2013.

Paper Details

Date Published: 17 September 2012
PDF: 16 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84441H (17 September 2012); doi: 10.1117/12.926716
Show Author Affiliations
Matt Johns, Giant Magellan Telescope Organization Corp. (United States)
Patrick McCarthy, Giant Magellan Telescope Organization Corp. (United States)
Keith Raybould, Giant Magellan Telescope Organization Corp. (United States)
Antonin Bouchez, Giant Magellan Telescope Organization Corp. (United States)
Arash Farahani, Giant Magellan Telescope Organization Corp. (United States)
Jose Filgueira, Giant Magellan Telescope Organization Corp. (United States)
George Jacoby, Giant Magellan Telescope Organization Corp. (United States)
Steve Shectman, Giant Magellan Telescope Organization Corp. (United States)
Michael Sheehan, Giant Magellan Telescope Organization Corp. (United States)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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