CCD Full-Field Sensitivity Monitor C8

Details CCD Full-Field Sensitivity Monitor C8 CCD Full-Field Sensitivity Monitor C8

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8416m&link_type=abstract

HST Proposal ID #8416

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Hst Proposal Id #8416

Scientific paper

Measure a photometric standard star field in Omega Cen in 50CCD mode every few months to monitor CCD sensitivity over the whole field of view. Keep the spacecraft orientation within a suitable range {+/- 5 degrees} to keep the same stars in the same part of the CCD for every measurement. The second observation is performed at an orientation rotated by 180 degrees with respect to the other observations to study the effect of CTE {to first order}. This test will give a direct transformation of the 50CCD magnitudes to the Johnson-Cousins system for red sources. These transformations should be accurate to 1%. The stability of these transformations will be measured to the sub-percent level. These observations also provide a check of the astrometric and PSF stability of the instrument over its full field of view.

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