WFPC Focus Sweep

Details WFPC Focus Sweep WFPC Focus Sweep

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.3404g&link_type=abstract

HST Proposal ID #3404

Computer Science

Hst Proposal Id #3404 Eng

Scientific paper

This proposal requests the use of PC6 with filters F487N and F889N in order to do a "focus sweep" as approved by the TTSC. There will be a realtime "target acquisition exposure" in order to place the star at the correct location in PC6. Then there will 7 sets of exposures at different secondary mirror despaces in order to measure the focus of the telescope. Prior to each set of exposures, realtime contacts must be established in order to move the secondary mirror. Each set of exposures consists of 4 exposures, a short and a long exposure in F487N and F889N. It is estimated that each set can be completed in one orbit, so eight orbits are required for this proposal. All exposures are to occur in fine lock, be pre-flashed, and not be cosmic ray split.

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