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In cases where there is no suitable guide star found when using the Guide Star Server, it is possible, before starting an exposure, to use the TV slitviewer to search for possible guide stars in the outer part of the field. The coordinates of the guide star can then be read using the TV cursor, and either the coarse or fine guide probe driven to the correct position to view that guide star.
The following points should be noted:
The detailed procedure is as follows. This example assumes observations using a short slit, and autoguiding using the coarse guide probe. Commands with the ICL prompt are issued from the system computer, commands with the TCS prompt are issued from the Telescope Control System, and commands with the A&G prompt are entered at the A&G terminal.
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