Optical quality of the W.M. Keck Telescope

Details Optical quality of the W.M. Keck Telescope Optical quality of the W.M. Keck Telescope

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2199...94w&link_type=abstract

Proc. SPIE Vol. 2199, p. 94-104, Advanced Technology Optical Telescopes V, Larry M. Stepp; Ed.

Physics

Optics

Scientific paper

Astronomical observations are now taking place on the Keck I telescope on a regular basis. We summarize here the status of the Keck I and II optics, and the current wavefront and image quality of the Keck I telescope as measured by in-telescope optical tests. Shack-Hartmann measurements of the individual primary mirror segments yield 80% encircled energy diameters that vary from 0.31 to 0.60 arc seconds. Full width at half maximum measurements of direct segment images obtained on a night of excellent seeing varied from 0.32 to 0.51 arcsec, and the combined image was 0.42 arcsec.

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