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Hubble Space Telescope
Space Telescope Imaging Spectrograph

Monitoring

Monitor Title Monitor Analysis
ACQ
Blind Pointing Lindsay Next TA Expert
Reference Aperture Stability Lindsay Next TA Expert
Lamp
Lamp Count Rate Sonnentrucker Sonnentrucker

Detector Behavior

Several calibration programs are executed every cycle to monitor the behavior of the STIS detectors.

For the CCD, the housing temperature, read noise and hot pixel annealing are monitored on a monthly basis.

For the MAMAs dark rate observations have been taken every two weeks. The NUV continues as before while the FUV measurements are taken every six weeks but with six exposures each time.

Target Acquisitions

Initial Pointing

The quality of the initial pointing of HST is monitored to search for a degradation in the STIS to FGS alignment. All target acquisitions are examined to determine the slew required to center the target in the STIS slit. These slews represent the error in the target coordinates, the error in the guide star positions, and the error in the STIS-to-FGS alignment.

The Fine Guidance Sensors undergo alignment shifts which are generally largest following installation, then decline with time. FGS realignments were performed in Dec 1997 for FGS3, in October 1998 and October 2002 for FGS1r, and in March 2000 and October 2002 for FGS3r. The plots below show the total errors in initial STIS pointings for monthly or bi-monthly periods, sorted according to the FGS which acquired the dominant guidestar.

Year Slew information
2013    Jul       Aug       Sep       Oct       Nov       Dec   
   Jan       Feb       Mar       Apr       May       Jun   
2012    Jul       Aug       Sep       Oct       Nov       Dec   
   Jan       Feb       Mar       Apr       May       Jun   
2011    Jul       Aug       Sep       Oct       Nov       Dec   
   Jan       Feb       Mar       Apr       May       Jun   
2010    Jul       Aug       Sep       Oct       Nov       Dec   
   Jan       Feb       Mar       Apr       May       Jun   
2009    Jul       Aug       Sep       Oct       Nov       Dec   
   Jan       Feb       Mar       Apr       May       Jun   
2004    Jul       Aug       Sep       Oct       Nov       Dec   
   Jan       Feb       Mar       Apr       May       Jun   
2003    Jul       Aug       Sep       Oct       Nov       Dec   
   Jan       Feb       Mar       Apr       May       Jun   
2002 Jan/Feb Mar/Apr May/Jun Jul/Aug Sep/Oct Nov/Dec
2001       Jul/Aug Sep/Oct Nov/Dec

Calibration Plans

For every observing cycle, a suite of calibrations programs is executed in order to create up-to-date calibration reference files.

Details for each suite of programs for cycles:  12  11  10  9  8  7

Status summaries for cycles:  10  9  8  7