Centroid Position as a Function of Total Counts in a Windowed CMOS Image of a Point Source
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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 983386
- Report Number(s):
- LLNL-PROC-434021; TRN: US201014%%307
- Resource Relation:
- Conference: Presented at: SPIE Astronomical Instrumentation 2010, San Diego, CA, United States, Jun 27 - Jul 02, 2010
- Country of Publication:
- United States
- Language:
- English
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