STIS Target Acquisitions During SMOV

Details STIS Target Acquisitions During SMOV STIS Target Acquisitions During SMOV

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997stis.rept...12k&link_type=abstract

STIS Instrument Science Report 97-12, 5 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph

Scientific paper

We summarize the first results on the analysis of in-flight STIS target acquisition (ACQ and ACQ/PEAK). These results show that the STIS target acquisition (ACQ) is working very accurately for point sources (within 0.5 pixels = 0.025 arcseconds), about 4 times better than specified in the Instrument Handbook. As a result of the accuracy of the ACQ algorithm, we are no longer recommending to perform ACQ/PEAKs for the 0.2 arcsecond wide slits. For diffuse acquisitions the accuracy varies with target size. Although analysis of ACQ/PEAK data is hampered by a flight software problem, we anticipate that peakups will be accurate to roughly ±5% of the slit width (instead of the ±15% pr eviously advertised). We are implementing several enhancements to the flight software that will take effect by mid- August to improve the quality of the acquisitions.

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