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Introduction

With the installation of the new A and G box on the JKT it is now possible to autoguide CCD exposures. The standard autoguider (i.e. the same as the INT) can reach an annular region around the target position and can guide on stars with V 12. The autoguider probe is supplied with two filter wheels, one for neutral density/clear filters of different thickness and the other for colour filters of differing thickness. The filters placed in front of the autoguider should be chosen so that the total physical thickness matches that of the CCD filter being used. Note that if the CCD filter wheel is removed at any time after ADAM startup then you must run the ZEROSET command when the filter wheel is back in place otherwise there is a danger of you observing with the wrong filter without realising it.

The WHEEL command is also now implemented on the JKT system (see III.4.4). The consequence of this is that the filter command will now only accept filter names e.g. FILTER V and the telescope focus is automatically adjusted when the filter command is issued.

Note also that the means of defining this focus offset has been clarified. The WHEEL command now requests the physical thickness of the filter and the focus offset. This value will appear in umits of 10 microns in the wheel file.