WFPC2 Cycle 5 Cal: Internal Monitor - Visflats

Details WFPC2 Cycle 5 Cal: Internal Monitor - Visflats WFPC2 Cycle 5 Cal: Internal Monitor - Visflats

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6189b&link_type=abstract

HST Proposal ID #6189

Computer Science

Performance

Hst Proposal Id #6189

Scientific paper

Twice a month, internal flat fields {VISFLATs} will be obtained using the visible cal-channel lamp with the photometric filter set plus a couple of narrow-band filters. The images will be used to monitor WFPC2's flat field response as well as to build a high S/N flat field database, which will provide information on the pixel to pixel response in the cameras and any possible long-term contamination-induced changes. The Woods' filter {F160BW} VISFLAT exposures will allow monitoring of its visible transmission {a check for pinholes} and the LRF {FR533N} exposures, one at each gain, will provide a monitor of the ADC's performance. Histograms generated from the ramp filter flats will be used to trace the ADC transfer curve. In addition to the monitor observations, an initial filter-sweep is done to obtain VISFLATs in all visible filters; these will be compared to the Cycle 4 filter-sweep data to verify that none of the filters are developing any problems and to provide a check of the calchannel's longterm stability.

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