Improvement to Auto-star-selection process

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robert.s...@gmail.com

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May 22, 2026, 10:00:17 PM (12 days ago) May 22
to Open PHD Guiding
It would be nice if there was a parameter to avoid the selection of a guiding star from a ''n'' number of pixels from the border of an image. 
I had several sessions where the main star is choosen only a few pixel from the border of the guiding field of view and I am afraid that the dithering process will move that star away from my field of view.

Robert

Bruce Waddington

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May 22, 2026, 10:17:31 PM (12 days ago) May 22
to Open PHD Guiding
If you are using random dithering (the default), the dithering process will not "push" the primary guide star out of the field of view, it specifically avoids doing that.  In addition, there is a built-in minimum separation from the edge of the frame based on the user-specified search region, and some session manager apps like Nina will let you specify a central region of interest for auto-star selection - although I would say that probably creates as many problems as it tries to solve.  Trying to micro-manage the auto-find process really isn't necessary.

Bruce

robert.s...@gmail.com

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May 22, 2026, 11:04:46 PM (12 days ago) May 22
to Open PHD Guiding
Thanks Bruce, I wasn't aware of that feature. 

Robert

Richard Scott

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May 23, 2026, 4:10:37 PM (12 days ago) May 23
to Open PHD Guiding
Hi Bruce,

This is great information to know and something I haven't seen in the manual. I too have been concerned about this.

Thank you,
Rick
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