Physics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001stis.rept....2w&link_type=abstract
Instrument Science Report STIS 2001-02, 19 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph
Scientific paper
STIS CCD, FUV-MAMA and NUV-MAMA observations in the globular cluster NGC 2808 were performed with a pattern of POS TARG offsets in order to determine the geometric distortion by measuring the offsets of the same stars at different positions on the detector. This test (proposal 8511) is similar to the one done during Servicing Mission Orbital Verification #2 (SMOV2) for the CCD and FUV-MAMA, but is published here for the first time for the NUV-MAMA. For the CCD, the fit to the distortion shows polynomial coefficients that are quite similar to the SMOV2 results. The original observations for the FUV and NUV-MAMA (visits 52 and 53 respectively) were repeated since only one guide star was used following a guide star acquisition failure for Visits 02 and 03. For the FUVMAMA the geometric distortion results differ slightly from the SMOV2 ones, with a significantly different X scale; the pattern of distortion is however very similar. The NUVMAMA distortion field is similar in shape to that of the FUV-MAMA, but the amplitude of the distortion field is slightly larger and can exceed 2 pixels at the detector corners. Coefficients for use in combining dithered images are presented for the three STIS detectors.
Goudfrooij Paul
Malumuth Eliot
Walsh Jonathan R.
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