Computer Science
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stis.rept...15s&link_type=abstract
Instrument Science Report STIS 98-15, 17 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph
Scientific paper
An on-orbit flat-field monitoring program was initiated for the MAMA detectors with the goals of comparing the pre-launch flat-field characteristics with those observed on-orbit, measuring the stability of the FUV- and NUV-flats, and creating updates to the reference flats. We found that the NUV-MAMA flat-field images at nominal (1024x1024) resolution are well corrected with pre-launch flats. That same comparison for the FUV-MAMA shows features in the pre-launch flat that make it unsuitible for generic pipeline use, although it resolves some important questions. The output of the flat-field lamps has declined ~15- 20% in less than 12 hours of on-orbit use, which is much larger than that expected. A plan is described for obtaining further on-orbit flat-field exposures in view of potentially much shorter lamp lifetimes, and for exploring alternatives for using the Kr and D2 lamps.
Ferguson Harry
Kaiser Mary Elizabeth
Shaw Dick
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