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3.1 Spectrograph Rotation, Auto-Guider and Telescope Limitations

The spectrograph can be rotated +/- 90 degrees from the default EW slit position. This must be done by hand while the telescope is at the zenith. The telescope operator is responsible for this operation to ensure that it is done in a safe manner and that the clamps are securely fastened. The position angle readout is in degrees using the classical definition (NS slit is zero degrees with increasing PA going from N towards E). Normally about ten minutes is required to change the position angle and rearrange the instrument cables during the night.

The telescope is equipped with an automatic guider capable of guiding on stars of magnitude

Guide star coordinates are found using a special program, gstar, on the SUN workstation that searches on-disk AGK2/SAO catalogues or the ST Guide Star List on CD-ROM. The telescope operators will find guide stars and the observer need not pre-select guide stars. Full capabilities exist to electronically transfer object coordinates to the telescope control computer from outside the Observatory. Observers can email their coordinate lists to coords@noao.edu. See Appendix II. Contact Dave Summers (Internet: summers@noao.edu) for details.

The guider also contains a quartz lamp and HeNeA combination for calibration of spectra. The lamps and ND filter wheels are fully integrated into the TCS (Telescope Control System) software, using a graphical user interface (GUI).


kessel@noao.edu
Wed Aug 2 13:05:25 MST 1995