NICMOS Coordinate System Conventions
Figure 6.1 shows how the NICMOS cameras are arranged in the HST field of view. The alignment of each camera is not exact, and the internal coordinate systems attached to each of them will differ by small rotations (< 1 degree). The FITS format data files generated for NICMOS observers will have a World Coordinate System specified appropriately for each camera. The adopted coordinate system for the 3 cameras is summarized in Figure 6.1.
Figure 6.1: Common NICMOS Coordinate System
