Pc PSF and Focus Monitoring 2

Details Pc PSF and Focus Monitoring 2 Pc PSF and Focus Monitoring 2

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.3230w&link_type=abstract

HST Proposal ID #3230

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Hst Proposal Id #3230

Scientific paper

The objective of this calibration test is to observe one or two bright stars each week to monitor the point spread function and focus changes caused by desorption or other changes in the ST-WFPC system. The stars are chosen to be within approximately 1 degree of ST targets so that a minimal length slew is required. The stars are sufficiently bright that the exposure times are extremely short allowing the observations to be carried out totally on gyros with negligible jitter and/or drift. These observations are short enough to fit into small (one 18 minute, or two 9 minute) gaps in the SMS. It is hoped that one or two filters can be exposed in each SMS, and it is unnecessary to run more than the two filters in any one SMS. The point-spread functions are necessary for accurate photometric measurement and clean deconvolution of all WFPC images. As an added bonus one gets precise information on the rate of desorption of the OTA.

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