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When there is a single bad (hot) pixel in the autoguider camera, there will be no guiding signals sent to the mount.? The program will think it is always locked on to the target (bad pixel).

This is the same as turning off autoguiding.? ?So all mount errors: polar alignment off will cause star trails in the DEC axis direction, and RA PE errors will cause stars to wiggle in the RA direction.

You will also get no autoguiding if your Gemini.net applet is set to C +center) or S (slew) rate.? Only G (guide) rate will allow autoguiding to function with Gemini.

In the PHD2 autoguiding program, you can eliminate hot pixels under the Brain icon by selecting 2x2 or 3x3 noise reduction.? ?You can turn off autoguiding in PHD2 under the Brain icon settings too, which you do when taking PE data.??

All the best,

Michael