Wf/pc Cycle 3 Cal: WFC Flats NARROW.2

Physics

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Hst Proposal Id #5013

Scientific paper

This program takes 'uniformly illuminated' images of the Earth to obtain information on the pixel-to-pixel variations in the gain of the WFC chips. These EARTH-CALs will be used for flat field corrections. Roughly half of the required narrow-band filters are obtained, both with and without neutral density to allow correction of wide-band earthcals taken with neutral density filters. Combinations are F375N F375N,F122M F375N,F8ND F487N F487N,F122M F487N,F8ND F502N F502N,F122M F502N,F8ND F588N F588N,F122M F588N,F8ND F673N F673N,F122M (on same filt wheel as F8ND) F889N F889N,F122M F889N,F8ND at 20 exposures for those taken with a second filter, and 30 exposures for those taken without a second filter.

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