ACS Distortion derived from RAS-HOMS Measurements

Details ACS Distortion derived from RAS-HOMS Measurements ACS Distortion derived from RAS-HOMS Measurements

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acs..rept....2c&link_type=abstract

Instrument Science Report ACS 2002-02, 20 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Stsci

Scientific paper

In the February 2001 calibration campaign at Ball Aerospace, measurements were made using RAS-HOMS. Two sets of measurements were performed to derive the ACS distortion patterns. A Ronchi ruling was placed at the image plane to provide a reference square grid. Also a series of laser point images were placed at measured positions to simulate stellar images. The ruling measurements define the shape of the distortion while the laser images give the absolute location in the vehicle frame. Analysis of the two sets of data provides the complete solution for the ACS detectors. We describe how the various aperture positions are defined and their properties calculated. Results of the analysis are supplied to the Science Instrument Aperture File and the ACS Image Distortion Coefficients calibration table.

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