Space Telescope Science Institute  9.8 STIS Internal Calibration Targets The Official STIS Aperture List for Cycle 17

9.9 STIS Coordinate System

Knowledge of the STIS coordinate system relative to the spacecraft coordinate system is necessary to use the POSition TARGet <X-value>,<Y-value> Special Requirement properly. The Figure below shows the sense of the U2 and U3 axes for the various STIS apertures.

Figure 9.1: STIS coordinate system

 
Shown projected onto the sky, as used with the POS TARG Special Requirement
9.8 STIS Internal Calibration Targets The Official STIS Aperture List for Cycle 17
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