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COS Coordinate System
Space Telescope Science Institute
Cycle 20 Phase II Proposal Instructions
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HST Phase II Proposal Instructions for Cycle 20 > Chapter 12: Cosmic OriginsSpectrograph (COS) > REFERENCE INFORMATION > 12.17 COS Coordinate System

12.17 COS Coordinate System
Knowledge of the COS 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 relative to the COS apertures.
Figure 12.1: COS Aperture Coordinate System

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