Overview and status of the Giant Magellan Telescope project

Rebecca A. Bernstein; Patrick J. McCarthy; Keith Raybould; Bruce C. Bigelow; Atonin H. Bouchez; José M. Filgueira; George Jacoby; Matt Johns; David Sawyer; Stephen Shectman; Michael Sheehan

doi:10.1117/12.2055282

22 July 2014 Overview and status of the Giant Magellan Telescope project

Rebecca A. Bernstein, Patrick J. McCarthy, Keith Raybould, Bruce C. Bigelow, Atonin H. Bouchez, José M. Filgueira, George Jacoby, Matt Johns, David Sawyer, Stephen Shectman, Michael Sheehan

Author Affiliations +

Proceedings Volume 9145, Ground-based and Airborne Telescopes V; 91451C (2014) https://doi.org/10.1117/12.2055282
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

The Giant Magellan Telescope (GMT) is a 25.4-m diameter, optical/infrared telescope that is being built by an international consortium of universities and research institutions as one of the next generation of Extremely Large Telescopes. The primary mirror of GMT consists of seven 8.4 m borosilicate honeycomb mirror segments that are optically conjugate to seven corresponding segments in the Gregorian secondary mirror. Fabrication is complete for one primary mirror segment and is underway for the next two. The final focal ratio of the telescope is f/8.2, so that the focal plane has an image scale of 1.02 arcsec/mm. GMT will be commissioned using a fast-steering secondary mirror assembly comprised of conventional, rigid segments to provide seeing-limited observations. A secondary mirror with fully adaptive segments will be used in standard operation to additionally enable ground-layer and diffraction-limited adaptive optics. In the seeing limited mode, GMT will provide a 10 arcmin field of view without field correction. A 20 arcmin field of view will be obtained using a wide-field corrector and atmospheric dispersion compensator. The project has recently completed a series of sub-system and system-level preliminary design reviews and is currently preparing to move into the construction phase. This paper summarizes the technical development of the GMT sub-systems and the current status of the GMT project.

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Rebecca A. Bernstein, Rebecca A. Bernstein, Patrick J. McCarthy, Patrick J. McCarthy, Keith Raybould, Keith Raybould, Bruce C. Bigelow, Bruce C. Bigelow, Atonin H. Bouchez, Atonin H. Bouchez, José M. Filgueira, José M. Filgueira, George Jacoby, George Jacoby, Matt Johns, Matt Johns, David Sawyer, David Sawyer, Stephen Shectman, Stephen Shectman, Michael Sheehan, Michael Sheehan, "Overview and status of the Giant Magellan Telescope project", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91451C (22 July 2014); doi: 10.1117/12.2055282; https://doi.org/10.1117/12.2055282

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