FOC Observations during Astigmatism Sweep

Details FOC Observations during Astigmatism Sweep FOC Observations during Astigmatism Sweep

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.3490j&link_type=abstract

HST Proposal ID #3490

Physics

Hst Proposal Id #3490

Scientific paper

This proposal will perform observations through the F486N filter in F/96 mode at four settings of the OTA secondary mirror. The settings are designed to measure the astigmatism by decentering and tilting the secondary mirror in such a way as to keep the coma zero. The settings will be chosen to give measurable astigmatism so as to indicate where the zero astigmatism position is, which is the fully-aligned configuration. The sequence should be performed at each OTA setting. The exposure with F486N filter and no ND's is to expose the pads satisfactorily. The core of the PSF will be saturated. The exposure with ND's is to allow an independent phase retrieval measurement. After the initial acquisition and realtime uplink to move the star to the center of the field, each sequence should take 1 orbit.

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