The On-Orbit Performance of the Galaxy Evolution Explorer

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Published 2005 January 17 • © 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation Patrick Morrissey et al 2005 ApJ 619 L7 DOI 10.1086/424734

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Author affiliations

1 Space Astrophysics Laboratory, Mail Stop 405-47, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125

2 Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109

3 Laboratoire d'Astrophysique de Marseille, B.P. 8, Traverse du Siphon, F-13376 Marseille Cedex 12, France

4 Space Sciences Laboratory, University of California, Berkeley, 7 Gauss Way, Berkeley, CA 94720

5 Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218

6 Center for Space Astrophysics, Yonsei University, Seoul 120-749, Korea

7 Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101

8 Infrared Processing and Analysis Center, Mail Stop 100-22, California Institute of Technology, 770 South Wilson Avenue, Pasadena, CA 91125

9 Laboratory for Astronomy and Solar Physics, Code 681, NASA Goddard Space Flight Center, Greenbelt, MD 20771

10 Department of Physics and Astronomy, UCLA, Box 951547, Los Angeles, CA 90095

Dates

  1. Received 2004 May 3
  2. Accepted 2004 July 27
  3. Published
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1538-4357/619/1/L7

Abstract

We report the first year's on-orbit performance results for the Galaxy Evolution Explorer (GALEX), a NASA Small Explorer that is performing a survey of the sky in two ultraviolet bands. The instrument comprises a 50 cm diameter modified Ritchey-Chrétien telescope with a 1fdg25 field of view, selectable imaging and objective-grism spectroscopic modes, and an innovative optical system with a thin-film multilayer dichroic beam splitter that enables simultaneous imaging by a pair of photon-counting, microchannel-plate, delay-line readout detectors. Initial measurements demonstrate that GALEX is performing well, meeting its requirements for resolution, efficiency, astrometry, bandpass definition, and survey sensitivity.

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10.1086/424734