WF/PC2 Cycle 4 Cal: CTE Dither Test

Details WF/PC2 Cycle 4 Cal: CTE Dither Test WF/PC2 Cycle 4 Cal: CTE Dither Test

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5646c&link_type=abstract

HST Proposal ID #5646

Computer Science

Hst Proposal Id #5646

Scientific paper

Previous photometric analysis of the Omega Cen field has revealed an apparent 10% ramp across each CCD in the direction of the columns (parallel register). Flatfielding does not remove the effect nor does it appear to be intrinsic to the flatfields; it is also seen in cosmic ray analysis of long dark frames. The purpose of this proposal is to quantify the effect in an efficient manner by obtaining five images (each offset slightly from the previous one) of the Omega Cen photometric field along the WFPC2 X direction and four images along the Y direction, again each image offset somewhat from the previous ones. The pointings, specified with postargs, will be arranged to ensure the maximum starfield overlap. The F555W filter is used along with the exposure times from the IDT's SMOV dither test, which will facilitate direct comparisons with the earlier data.

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