Focus Monitor

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Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9574g&link_type=abstract

HST Proposal ID #9574

Physics

Hst Proposal Id #9574

Scientific paper

The HST focus is monitored using WFPC2/PC1. In principle ACS/HRC should provide superior capability for monitoring the HST focus. Since most of the HST science will shift to ACS in Cycle 11 trending observations are initiated with this program to establish the focus of WFPC2/PC1 {and hence HST} and ACS/HRC {and WFC to a lessor degree} using exposures over full orbits that are taken in parallel. With parallel exposures breathing cancels out for the relative camera offset. This was part of an interim calibration program to bridge the gap between SMOV and regular Cycle 11, but wanted to go so early it was changed to a SMOV proposal.

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