Computer Science
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept...32b&link_type=abstract
Instrument Science Report WFC3 2009-32, 6 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
I review the image stability tests performed during the Servicing Mission Observatory Verifica- tion (SMOV) campaign for the Wide Field Camera 3 (WFC3). These tests were performed using repeated observations of globular clusters with the telescope oriented at hot and cold thermal attitudes. As expected from ground tests in 2007, the WFC3 image stability is slightly worse than specifications. The maximum drift in the UVIS channel was 1.4 times that of specification, while the maximum drift in the IR channel was 1.3 times that of specification; the largest violations occurred with the telescope at a hot thermal attitude, but during most visits there were no viola- tions of the stability specifications. For comparison, in ground tests, the UVIS channel drifts ex- ceeded specification by 1.3x - 2x, while the IR channel drifts exceeded specification by 1.3x, with the violations occurring nearly constantly during simulations of a hot thermal attitude. The magnitude of image drift in SMOV is thus similar to that observed in ground tests, with the ex- ceptions to the stability specification occurring in 1/6 of the UVIS visits and 1/3 of the IR visits.
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