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Proceedings Paper

Overview of the Advanced Camera for Surveys on-orbit performance
Author(s): Holland C. Ford; Mark Clampin; George F. Hartig; Garth D. Illingworth; Marco Sirianni; Andre R. Martel; Gerhardt R. Meurer; William Jon McCann; Pamela C. Sullivan; Frank Bartko; Narcisco Benitez; John Blakeslee; Rychard Bouwens; Tom Broadhurst; Robert A. Brown; Christopher J. Burrows; Douglas Campbell; Edward S. Cheng; Paul D. Feldman; Marijn Franx; David A. Golimowski; Caryl Gronwall; Randy A. Kimble; John E. Krist; Michael P. Lesser; Dan Magee; George Miley; Marc Postman; Marc D. Rafal; Piero Rosati; William Brian Sparks; Hien D. Tran; Zlatan I. Tsvetanov; Paul Volmer; Richard L. White; Robert A. Woodruff
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Paper Abstract

We present an overview of the ACS on-orbit performance based on the calibration observations taken during the first three months of ACS operations. The ACS meets or exceeds all of its important performance specifications. The WFC and HRC FWHM and 50% encircled energy diameters at 555 nm are 0.088" and 0.14", and 0.050" and 0.10". The average rms WFC and HRC read noises are 5.0 e- and 4.7 e-. The WFC and HRC average dark currents are ~ 7.5 and ~ 9.1 e-/pixel/hour at their operating temperatures of - 76°C and - 80°C. The SBC + HST throughput is 0.0476 and 0.0292 through the F125LP and F150LP filters. The lower than expected SBC operating temperature of 15 to 27°C gives a dark current of 0.038 e-/pix/hour. The SBC just misses its image specification with an observed 50% encircled energy diameter of 0.24" at 121.6 nm. The ACS HRC coronagraph provides a 6 to 16 direct reduction of a stellar PSF, and a ~1000 to ~9000 PSF-subtracted reduction, depending on the size of the coronagraphic spot and the wavelength. The ACS grism has a position dependent dispersion with an average value of 3.95 nm/pixel. The average resolution λ/Δλ for stellar sources is 65, 87, and 78 at wavelengths of 594 nm, 802 nm, and 978 nm.

Paper Details

Date Published: 24 February 2003
PDF: 14 pages
Proc. SPIE 4854, Future EUV/UV and Visible Space Astrophysics Missions and Instrumentation, (24 February 2003); doi: 10.1117/12.460040
Show Author Affiliations
Holland C. Ford, Johns Hopkins Univ. (United States)
Mark Clampin, Space Telescope Science Institute (United States)
George F. Hartig, Space Telescope Science Institute (United States)
Garth D. Illingworth, Univ. of California/Santa Cruz/Lick Observatory (United States)
Marco Sirianni, Johns Hopkins Univ. (United States)
Andre R. Martel, Johns Hopkins Univ. (United States)
Gerhardt R. Meurer, Johns Hopkins Univ. (United States)
William Jon McCann, Johns Hopkins Univ. (United States)
Pamela C. Sullivan, NASA Goddard Space Flight Ctr. (United States)
Frank Bartko, Bartko Science and Technology (United States)
Narcisco Benitez, Johns Hopkins Univ. (United States)
John Blakeslee, Johns Hopkins Univ. (United States)
Rychard Bouwens, Univ. of California/Santa Cruz (United States)
Tom Broadhurst, Racah Institute of Physics/Hebrew Univ. (Israel)
Robert A. Brown, Space Telescope Science Institute (United States)
Christopher J. Burrows, Consultant (United States)
Douglas Campbell, NASA Goddard Space Flight Ctr. (United States)
Edward S. Cheng, NASA Goddard Space Flight Ctr. (United States)
Paul D. Feldman, Johns Hopkins Univ. (United States)
Marijn Franx, Leiden Univ. (Netherlands)
David A. Golimowski, Johns Hopkins Univ. (United States)
Caryl Gronwall, Johns Hopkins Univ. (United States)
Randy A. Kimble, NASA Goddard Space Flight Ctr. (United States)
John E. Krist, Space Telescope Science Institute (United States)
Michael P. Lesser, Univ. of Arizona (United States)
Dan Magee, Univ. of California/Santa Cruz (United States)
George Miley, Leiden Univ. (United States)
Marc Postman, Space Telescope Science Institute (United States)
Marc D. Rafal, National Radio Astronomy Observatory (United States)
Piero Rosati, European Southern Observatory (Germany)
William Brian Sparks, Space Telescope Science Institute (United States)
Hien D. Tran, Johns Hopkins Univ. (United States)
Zlatan I. Tsvetanov, Johns Hopkins Univ. (United States)
Paul Volmer, Ball Aerospace & Technologies Corp. (United States)
Richard L. White, Space Telescope Science Institute (United States)
Robert A. Woodruff, Boeing-SVS Inc. (United States)


Published in SPIE Proceedings Vol. 4854:
Future EUV/UV and Visible Space Astrophysics Missions and Instrumentation
J. Chris Blades; Oswald H. W. Siegmund, Editor(s)

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