Physics
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ota..rept....1l&link_type=abstract
Instrument Science Report OTA 2001-01, 11 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute
Scientific paper
After the last HST refocusing in June 2000, an enhanced OTA focus monitor (8829) began running as a cycle 9 observatory-level calibration to supplement the existing WFPC2 focus checks made as part of their standard photometric / decontamination monitor. The test was designed to improve our understanding of both the HST focus state and of the monitoring itself, allowing us to track and predict OTA focus changes, which during the past two years have been less smooth than anticipated. In addition to providing better temporal sampling, 8829 also utilized STIS imaging which helped quantify an apparent systematic between the two SIs. The program's WFPC2 observations were made in two filters and at two chip positions, also to test systematics. None were found. A review of the focus results show that since the June 2000 refocusing, there has been no meaningful trend in the focus state of HST. As an appendix, findings are presented which do not support the hypothetical scenario of an accumulation of observed coma as the result of a failed secondary mirror actuator.
Gilliland Ron
Krist John
Lallo Matthew
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