The on-orbit performance of the galaxy evolution explorer

Patrick Morrissey, David Schiminovich, Tom A. Barlow, D. Christopher Martin, Brian Blakkolb, Tim Conrow, Brian Cooke, Kerry Erickson, James Fanson, Peter G. Friedman, Robert Grange, Patrick N. Jelinsky, Siu Chun Lee, Dankai Liu, Alan Mazer, Ryan Mclean, Bruno Milliard, David Randall, Wes Schmitigal, Amit SenOswald H.W. Slegmund, Frank Surber, Arthur Vaughan, Maurice Viton, Barry Y. Welsh, Luciana Bianchi, Yong Ik Byun, Jose Donas, Karl Forster, Timothy M. Heckman, Young Wook Lee, Barry F. Madore, Roger F. Malila, Susan G. Neff, R. Michael Rich, Todd Small, Alex S. Szalay, Ted K. Wyder

Research output: Contribution to journalArticlepeer-review

292 Citations (Scopus)


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 1°.25 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.

Original languageEnglish
Pages (from-to)L7-L10
JournalAstrophysical Journal
Issue number1 II
Publication statusPublished - 2005 Jan 20

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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