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In-orbit performance of the COSTAR-corrected Faint Object Camera
Jedrzejewski, R. I.; Hartig, G.; Jakobsen, P.; Crocker, J. H.; Ford, H. C.
AA(Space Telescope Science Inst., Baltimore, MD, US), AB(Space Telescope Science Inst., Baltimore, MD, US), AC(European Space Agency, Noordwijk, Netherlands), AD(European Space Agency, Noordwijk, Netherlands), AE(Space Telescope Science Inst., Baltimore, MD, US)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 435, no. 1, p. L7-L10 (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Angular Resolution, Astronomical Photometry, Faint Object Camera, Hubble Space Telescope, Image Processing, Performance Tests, Aberration, Calibrating, Light (Visible Radiation), Maintenance, Signal To Noise Ratios
Bibliographic Code:


The improvements due to the Corrective Optics Space Telescope Axial Replacement (COSTAR) on imaging with the Faint Object Camera (FOC) on board the Hubble Space Telescope (HST) are presented. The encircled energy performance is dramatically improved, such that 85% of the total light in the Point Spread Function (PSF) is now enclosed within a circle of radius 0.1 sec at 486 nm wavelength, compared to 18% in the spherically aberrated PSF. This is equivalent to a sensitivity increase of 1.6 mag. The effective angular resolution is also improved from 66 to 43 mas at 486 nm. These improvements are slightly offset by a 20% lower total throughput at visible wavelengths. The plate scale is changed from 22.3 mas/pixel to 14.35 mas/pixel, resulting in a decrease in the field of view from 11 x 11/sq arcsec to 7.3 x 7.3/sq arcsec for the workhorse 512 x 512 format.

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