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The HST Focal Plane and the GHRS Apertures

GHRS Instrument Handbook


Design and Construction of the GHRS

We provide here a description of the instrument in largely pictorial terms. More illustrations and full technical descriptions of the GHRS may be found in the references (see Section on page 122).

Figure 6.1: The Hubble Space Telescope and its components. The locations of important elements are shown.

Figure 6.2: The focal plane of HST and the definitions of the V2, V3, U2, and U3 axes in the coordinate system of the spacecraft.

Figure 6.3: Locations of GHRS apertures relative to spacecraft axes. Note that the sense of the x and y motions are shown by the arrows, but that the zero point for each aperture (LSA and SSA) is located at its center. COSTAR has not changed the layout of the entrance apertures, but it has altered the way in which the sky is imaged onto the focal plane. The sense of the change is that the signs of motion in both coordinates, V2 and V3 (or U2 and U3) are reversed.

Figure 6.4: Optical Schematic of the GHRS.

Figure 6.1: - The Hubble Space Telescope and its components. The locations of important elements are shown.
Figure 6.2: - The focal plane of HST and the definitions of the V2, V3, U2, and U3 axes in the coordinate system of the spacecraft.
Figure 6.3: - Locations of GHRS apertures relative to spacecraft axes. Note that the sense of the x and y motions are shown by the arrows, but that the zero point for each aperture (LSA and SSA) is located at its center. COSTAR has not changed the layout of the entrance apertures, but it has altered the way in which the sky is imaged onto the focal plane. The sense of the change is that the signs of motion in both coordinates, V2 and V3 (or U2 and U3) are reversed.
Figure 6.4: - Optical Schematic of the GHRS.