19 July 2010 Centroid precision as a function of total counts in a windowed CMOS image of a point source
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Abstract
We obtained 960,200 22-by-22-pixel windowed images of a pinhole spot using the Teledyne H2RG CMOS detector with un-cooled SIDECAR readout. We performed an analysis to determine the precision we might expect in the position error signals to a telescope's guider system. We find that, under non-optimized operating conditions, the error in the computed centroid is strongly dependent on the total counts in the point image only below a certain threshold, approximately 50,000 photo-electrons. The LSST guider camera specification currently requires a 0.04 arcsecond error at 10 Hertz. Given the performance measured here, this specification can be delivered with a single star at 14th to 18th magnitude, depending on the passband.
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Ron Wurtz, Scot Olivier, Vincent Riot, Brandon J. Hanold, Donald F. Figer, "Centroid precision as a function of total counts in a windowed CMOS image of a point source", Proc. SPIE 7742, High Energy, Optical, and Infrared Detectors for Astronomy IV, 774228 (19 July 2010); doi: 10.1117/12.857659; https://doi.org/10.1117/12.857659
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