Overview of the advanced camera for surveys on-orbit performance

Holland Ford, Mark Clampin, George Hartig, Garth Illingworth, Marco Sirianni, Andre Martel, Gerhardt Meurer, Wm Jon McCann, Pam Sullivan, Frank Bartko, Narciso Benitez, John Blakeslee, Rychard Bouwens, Tom Broadhurst, Robert Brown, Chris Burrows, Doug Campbell, Ed Cheng, Paul Feldman, Marijn FranxDavid Golimowski, Caryl Gronwall, Randy Kimble, John Krist, Michael Lesser, Dan Magee, George Miley, Marc Postman, Marc Rafal, Piero Rosati, William Sparks, Hien Tran, Zlatan Tsvetanov, Paul Volmer, Rick White, Robert Woodruff

Research output: Contribution to journalConference articlepeer-review

68 Scopus citations


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 inches and 0.14 inches, and 0.050 inches and 0.10 inches. 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 inches 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 wavelength of 594 nm, 802 nm, and 978 nm.

Original languageEnglish (US)
Pages (from-to)81-94
Number of pages14
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2002
EventFuture EUV/UV and Visible Space Astrophysics Missions and Instrumentation - Waikoloa, HI, United States
Duration: Aug 22 2002Aug 23 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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