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Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 22 > Chapter 17: Calibration Statusand Plans > 17.10 SM4 and SMOV4 Calibration

17.10
After the successful repair of the STIS during SM4, a plan for verification and preliminary calibration was executed during the subsequent period of Servicing Mission Observatory Verification (SMOV4). The SMOV4 plan for STIS focused on ensuring that observers can obtain data of sufficient quality to meet their scientific goals, but some of the more time consuming calibration observations that do not affect the planning of observations and which can be applied retroactively, (e.g., high signal-to-noise pixel-to-pixel flats and high precision sensitivity determinations for all central wavelength settings), were deferred and included in the Cycle 17 calibration plan. As a result the initial calibration precision for STIS data products delivered early in Cycle 17 is less than that which will ultimately be obtainable when the final calibration reference files become available for those observations. Significant updates to the calibration will be announced on the STIS webpage and reported in STIS Space Telescope Analysis Newsletters (STANS).
 
A summary of preliminary STIS SMOV4 activities follows.
STIS-01: Modes and Data Interface Checks
STIS-02: Memory Load and Dump
STIS-03: Science Data Buffer Check with Self-Test
STIS-04: Mechanism Mini-Functional
STIS-05: CCD Anneal
STIS-06: CCD Functional
STIS-07: CCD Bias and Dark Monitor
STIS-08: Aperture Wheel and Lamp Functional Tests
Thermal drifts are measured using repeated observations of the 0.2X0.2 aperture interspersed throughout the test.
STIS-09: STIS to FGS Alignment
STIS-10: CCD Optical Format Verification
Measurement of the location of the CCD spectra and images on the detector for each CCD spectral element (G230LB, G230MB, G430L, G430M, G750M, G750) and MIRVIS using the HITM calibration lamps.
STIS-11: External Focus Check
Evaluation of the STIS PSF at the aperture plane using small slit (0.1X0.09) ACQ/PEAK images and point source images with the F28X50OII filter.
STIS-12: Corrector and Focus Alignment
STIS-13: CCD Spectroscopic Image Quality and ACQ Tests
STIS-14: CCD CTE Check
Lamp exposures are taken at multiple positions along the 0.05X31ND slit, and read-out using amplifiers D and B, to search for, and compare, CTE losses as a function of Y-position on the detector.
STIS-15: CCD Spectroscopic Throughputs
STIS-16: CCD Image and Pointing Stability
STIS-17: FUV-MAMA HV Recovery
The FUV-MAMA voltage is ramped-up in stages while taking dark exposures and using on-board count rate monitors to protect against anomalies. Fold analysis is performed after it has been verified that the voltage can be safely ramped-up to the required level.
STIS-18: NUV-MAMA HV Recovery
The NUV-MAMA voltage is ramped-up in stages while taking dark exposures and using on-board count rate monitors to protect against anomalies. A fold analysis is performed after it has been verified that the voltage can be safely ramped-up to the required level.
STIS-19: FUV-MAMA Dark Measure
Characterization of the FUV-MAMA glow as a function of detector warm-up through the acquisition of a series of darks spanning the 5-orbit SAA-free period.
STIS-20: NUV Dark Monitor
STIS-21: FUV-MAMA Optical Format Verification
Measurement of the location of the FUV spectra on the detector for each FUV-MAMA spectral element (G140L, G140M, E140M, and E140H) using the HITM calibration lamps.
STIS-22: NUV-MAMA Optical Format Verification
Measurement of the location of the NUV spectra on the detector for each NUV-MAMA spectral element (G230L, G230M, E230M, E230H, and PRISM) using the HITM calibration lamps.
STIS-23: FUV-MAMA Image Quality
Checks the cross dispersion PSF using point source spectra of G140L obtained at multiple positions along a long slit.
STIS-24: NUV-MAMA Image Quality
Checks the cross dispersion PSF using point source spectra of G230L obtained at multiple positions along a long slit.
STIS-25: MAMA Spectroscopic Throughputs
STIS-26: MAMA Image Stability
For more information on the STIS SMOV4 plans, see the STIS SMOV4 webpage.

Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 22 > Chapter 17: Calibration Statusand Plans > 17.10 SM4 and SMOV4 Calibration

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