Computer Science
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stis.rept...23b&link_type=abstract
STIS Instrument Science Report 98-23, 14 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph
Scientific paper
This report presents values of the plate scales and anamorphic magnification in the STIS CCD spectroscopic modes. The results of the in-flight geometric distortion test are adapted as the most reliable measure of the CCD camera mode magnification, yielding an imaging mode plate scale of 0.05071 0.0007 arcseconds per pixel. Differences with ray trace results amount to an as-built increased magnification of 1.00335. The measured grating dispersions are compared with the calculated values and show very consistent agreement provided the as-built magnification past the mode select mechanism (MSM) is 1.0027 that of the design. The combination of this result and the geometric distortion plate scale imply that the as-built OTA-MSM magnification is 1.00065 that of the design. The measured dispersions at four grating settings are unusually discrepant; the calculated dispersions are probably more reliable and will be incorporated for use in the calstis pipeline. A simple model incorporating only grating anamorphic magnification gives good agreement with direct ray tracing. The values of dispersion direction plate scales, incorporating the plate scale determination from the geometric distortion test, are derived and presented using this model. An example of the use of the model to determine the plate scale for specific wavelengths is presented.
Baum Stefi
Bowers Charles
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