Computer Science – Performance
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10445c&link_type=abstract
HST Proposal ID #10445
Computer Science
Performance
Hst Proposal Id #10445
Scientific paper
This test of the coronagraphic procedure duplicates observations that have been taken in normal 3-gyro mode in proposal . It will take place in the period February 21st to 23rd 2005, or February 28th to March 2nd. The available roll angles depend on the dates. Earth flats with the coronagraph in place are taken every week as part of proposal 10377. The last observation taken before entering 2-Gyro mode should ideally be 2 days before this proposal starts. If the interval is shorter there will not be enough time to generate the best offset but if it is longer there is a greater chance for an intervening spot movement. 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. Repeat 3-gyro measurements and compare
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