WF/PC2 Cycle 4 Cal: CTE Dither Test - Part II

Details WF/PC2 Cycle 4 Cal: CTE Dither Test - Part II WF/PC2 Cycle 4 Cal: CTE Dither Test - Part II

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5659c&link_type=abstract

HST Proposal ID #5659

Computer Science

Hst Proposal Id #5659

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. This proposal is essentially a copy of 5646 (CTE DITHER); only the filter names and exposure times have been changed. Here, filters F814W and F439W are used along with the exposure times from the IDT's SMOV dither test in order to facilitate direct comparisons with the earlier data.

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