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Telescope parameters

The following are classified as telescope specific information:

• GP_X0: X-coordinate for the guide-probe origin (AAT specific).
• GP_Y0: Y-coordinate for the guide-probe origin (ATT specific).
• DRZ: differential atmospheric refraction at the zenith such that .
• LATOBS: the latitude of the observatory.
• SCALE0: the linear scaling factor from the sky to the mask (radians/mm) -- similar to Scale
• SCALE1: the non-linear term for more precise scaling -- should be zero at WHT.
• SCALE2: the power term for the scaling -- should be zero at WHT

The command SET FIELD prompts the user to enter a description of the field-centre coordinates, RA, DEC, EQUINOX, EPOCH and POSITION_ANGLE.