STIS-11 External Focus Check

Details STIS-11 External Focus Check STIS-11 External Focus Check

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11386p&link_type=abstract

HST Proposal ID #11386. Cycle 17

Computer Science

Scientific paper

This proposal will check the STIS focus and alignment using two tests. In the first test, ACQ/PEAK exposures with the G230LB are used to dither the 0.1x0.09 aperture across a point source to sample the PSF. Relative counts at different wavelengths give a measure of PSF shape at different wavelengths. Full frame comparison exposures will also taken using the 0.1X0.09 and 52X2 apertures, and the relative aperture throughputs will give an estimate of the image quality at the STIS aperture plane. In the second test, the target is imaged onto the STIS CCD using the narrow-band F28x50OII filter. Comparison with previous OII images will be done to estimate the state of the focus.;

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