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Space Telescope Imaging Spectrograph
STIS-13

ACTIVITY TITLE: CCD Spectroscopic Image Quality and ACQ Tests

ID: STIS-13

APPLICABLE SMOV REQUIREMENTS: L.10.5.2.2, 10.4.5.3.4

DESCRIPTION: Check image quality along the 52x0.1 slit in combination with the G230LB grating. The target star will be positioned at several positions along the slit including 52X0.1 (nominal center position), 52X0.1E1 (CTE position) and 51X0.1D1 (MAMA acquisitions near low background for FUV MAMA). Several other positions on the far side of the CCD detector will be included pending available observing time in the allocated two orbits. Positioning of the target will be done utilizing PATTERN and offsets of 0.1” between three positions.

Sufficient targets will be selected, and contingency visits prepared, to allow this activity to occur any time during the BEA period.

IMPLEMENTATION METHOD: Stored commanding

DEPENDENCIES: Must execute after STIS-11 (after STIS-12 if corrector/focus alignment needed). Test should be deferred or repeated if significant change in the HST Focus and/or STIS corrector position is found to have been needed.

DURATION: 2 external orbits

DATA REQUIREMENTS: 0.4 Gbits

ANALYSES & EXPECTED RESULTS: Analysis will be with IDL tools in collaboration with Don Lindler. Plots will be made to compare centering from previous SMOV and calibration tests. Test may have to be repeated if HST focus significantly away from nominal.

COMMENTS: Old versions: SMOV3B-STIS02 8958 (but added E1 and D1 peakups), also subset of SMOV2-STIS18 7077. Note that current procedure utilizes CR-SPLIT=NO in order to get 8 three position measures along the slit. Could be changed to 4 five position measures.

AUTHOR/telephone/email: T. Gull/301-286-6184/Theodore.R.Gull@nasa.gov

DATE: September 28, 2007