Autoguiding with a Sky Model in Place?

Wayne Hixson

I recently completed my first APPM model with my Mach2. It really appears to help my pointing and guiding, with round stars on 5-minute unguided subs. However when I tried to introduce guiding with PHD2 or MaximDL, using the same settings as before, my RMS jumps to 1” or more where I was getting under 0.6” without the model. I’m using an OAG with Ultrastar on a 130GTX and f/6.7 field flattener. Any suggestions? Maybe just go without guiding? I like to use for minor corrections and dithering. 


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