Seeing measurements at the Multiple Mirror Telescope obtained with a very high quality 1.8-m primary mirror

Frederic H. Chaffee; Richard H. Cromwell

doi:10.1117/12.19167

1 July 1990 Seeing measurements at the Multiple Mirror Telescope obtained with a very high quality 1.8-m primary mirror

Frederic H. Chaffee, Richard H. Cromwell

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19167
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

Image-quality data are presented which were gathered at the University of Arizona's Multiple Mirror Telescope (MMT) using a very high quality 1.8-m mirror, for median image sizes of 0.72 arcsec in 8-sec integrations. The measured image is judged to have been degraded by 0.48 arcsec from that allowed by the free atmosphere by such factors as errors in telescope focus, collimation, mirror support, mirror seeing, and the combined optical figure of the five mirror surfaces required to bring the light to the image-analysis CCD. These data imply the appropriateness of a total optical error budget of 0.2 arcsec for 8-m diameter telescopes currently being designed.

Citation Download Citation

Frederic H. Chaffee and Richard H. Cromwell "Seeing measurements at the Multiple Mirror Telescope obtained with a very high quality 1.8-m primary mirror", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19167

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