Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7623b&link_type=abstract
HST Proposal ID #7623
Computer Science
Hst Proposal Id #7623
Scientific paper
Using both intflat and visflat observations, this WFPC2 proposal is designed to monitor the pixel to pixel flatfield response and the visflat lamp degradation, as well as detect any possible changes due to contamination. This proposal is a combination and continuation of the Cycle 6 Visflat Monitor and Intflat Monitor proposals {6906, 6907, respectively}, with some significant changes in the visflat portion. To conserve the visflat lamp lifetime, the number and frequency of visflat observations have been significantly reduced compared to previous cycles; the current plan is to obtain a mini-sweep of visflats before and after a decon, twice during the cycle. In addition, visflats taken with a ramp filter, one at each gain, will be done at post-decon visits to provide a check of the A-to-D correction. The intflat portion of this proposal will consist of short monitor visits once a month, along with two sets each of a filter sweep and a linearity test. The intflat images will provide a backup database in the event of complete failure of the visflat lamp as well as allow monitoring of the gain ratios. The monitor visits consist of exposures in the 5 standard broadband filters while the sweep is a complete set of internal flats cycling through both shutter blades and both gains. The linearity test will obtain a series of INTFLAT with both gains and both shutters. Since the INTFLATs have significant spatial structure, any non linearity would appear as a non uniform ratio of INTFLATs with different exposure times. A set of exposures is also taken with gain 7, shutter B, and clocks=YES. Cycle 7 is 22 months long {24 4-week periods, 24 decons}
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