ACQUISITION MODES
Following the initial guide star acquisition for your visit, the target location in the aperture plane will be known to an accuracy of 1Ð2 arcseconds. For science observations taken through slits which are less than 3 arcseconds in either dimension and for science observations using the coronographic bars, you will need to use target acquisition (ACQ Mode) and possibly acquisition peak-up exposures (ACQ/PEAK Mode) to center your target. The CCD detector may be used for acquisitions of targets which will be observed in the CCD and MAMA ACCUM Modes and in the MAMA TIME-TAG Mode. Details on the STIS target acquisition modes are in the STIS Instrument Handbook
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The STIS Target Acquisition Exposure Time Calculator (ETC) and Target Acquisition Simulator are tools provided by STScI to help plan acquisitions. Look under ÒToolsÓ on the STIS web page: http://www.stsci.edu/stis
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