ACS Two-Gyro mode coronography test

Details ACS Two-Gyro mode coronography test ACS Two-Gyro mode coronography test

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10460c&link_type=abstract

HST Proposal ID #10460

Computer Science

Performance

Hst Proposal Id #10460

Scientific paper

This test of the coronagraphic procedure will be run soon after entering the two gyro mode. It duplicates observations that have been taken in normal 3-gyro mode in proposals 9667 or 9668 and is simalar to the 2-Gyro test of Feb 2005. One orbit is used to measure the light which gets around the coronagraph in four filters. The second orbit is a test of the repeatibility and the third orbit replicates the others but at a different roll angle to permit a more detailed analysis of the coronagraphic performance. We include two pairs of HRC earth flats, immediately following the coronagraphic observations, taken with the coronagraph in place to measure the exact position of the spot, which sometimes moves several pixels. The coronagraphic observations include a USE OFFSET incorporating the information gained from the earth flats. The actual execution date is unknown, but the indicated target has been chosen top be observable in August. If necessary, a new target will be selected before the observation. ***** SCHEDULERS ***** Please choose either visits 1-5, 11-15, or 21-25 based on visibility of the targets.

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