Space Telescope Science Institute
Cycle 19 Phase II Proposal Instructions
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HST Phase II Proposal Instructions for Cycle 19 > Chapter 9: Space Telescope Imaging Spectrograph (STIS) > REFERENCE INFORMATION > 9.9 STIS Coordinate System
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
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