WFPC2 Cycle 6 Cal: Internal Monitor - Visflats

Details WFPC2 Cycle 6 Cal: Internal Monitor - Visflats WFPC2 Cycle 6 Cal: Internal Monitor - Visflats

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6906s&link_type=abstract

HST Proposal ID #6906

Computer Science

Performance

Hst Proposal Id #6906

Scientific paper

Twice a month, internal flat fields {VISFLATs} were obtained using the visible cal-channel lamp with the photometric filter set plus a couple of narrow-band filters. The images were used to monitor WFPC2's flat field response as well as to build a high S/N flat field database, which provided information on the pixel to pixel response in the cameras and any possible long-term contamination-induced changes. However, due to the degradation of the VISFLAT lamp, these observations have been significantly scaled back. In September and October, two pairs of observations will be done to include intflats. Each pair consists of a set of visflats taken before and after a decon. Then, prior to the servicing mission, another pair of observations will be obtained, and another pair in March 1997. For VISFLAT observations: The LRF {FR533N} exposures, one at each gain, taken after decon 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. ON HOLD: 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 5 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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