STIS CCD Imaging Sensitivity Monitor

Details STIS CCD Imaging Sensitivity Monitor STIS CCD Imaging Sensitivity Monitor

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7639g&link_type=abstract

HST Proposal ID #7639

Physics

Hst Proposal Id #7639

Scientific paper

A photometric standard star field in Omega Cen is monitored in 50CCD mode every few months to monitor CCD sensitivity over the whole field of view of the STIS CCD. The first three visits execute three months after the preceding one; visit 4 and 5 execute 6 months after their preceding visit. The spacecraft orientation should be kept within a small range {say +/- 5 degrees} to keep the same stars in the same part of the CCD for every measurement. In order to study the effect of CTE, it would be desirable to rotate the image by 180 degrees on the occasion 6 months after the first observation. This proposal should give a check on the long-term, full-field photometric stability of the instrument.

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