WFC3 SMOV Proposals 11419, 11426, 11431, and 11446: On-Orbit Darks

Details WFC3 SMOV Proposals 11419, 11426, 11431, and 11446: On-Orbit Darks WFC3 SMOV Proposals 11419, 11426, 11431, and 11446: On-Orbit Darks

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009nicm.rept...16b&link_type=abstract

WFC3 Instrument Science Report 2009-16, 20 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3

Scientific paper

This report summarizes the basic on-orbit characteristics of the SMOV UVIS dark frames. We investigate the dark current, the hot pixels, and describe the superdark. The average on-orbit dark current is measured to be 1.62e-/pix/hr with a standard deviation of 0.29 for chip#1 (amps A & B) and 1.70 e-/pix/hr with a standard deviation of 0.34 for chip#2 (amps C & D). Compared to ground tests, the dark current is 5x higher than expected yet well below the CEI spec of 20 e-/pix/hr. We discuss details of various checks to investigate possible causes for the higher rate. In addition to the overall increased dark rate we find a number of dark frames with extremely elevated dark current (>4 e-/pix/hr) for which we provide details of our investigation. We chose the hot pixel cutoff to be 20 e-/hr and measure a hot pixel rate of 530 hot pixels/day. We find that >70% of the hot pixels are fixed after an anneal.

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