Guide Assistant shows periodic error?

[robertson...@gmail.com]

Hello all,

This past week I’m setting up my newly arrived Paramount MX+ mount. After polar alignment using the PHD2 drift tool, I guided for a while then ran Guide Assistant for a long amount of time. Please see the first log in the uploaded file, 2022-01-08 18:44:09. Two quick questions. The Log File Viewer indicates Polar Alignment Error: 2.8’. Is that generally within acceptable limits or should I try to refine that some more?

Second question, while running guide assistant the RA line shows a repeated oscillation. I’m I correct that that is periodic error? PEC correction is my next project if the sky ever clears again (Pacific Northwest).

https://openphdguiding.org/logs/dl/PHD2_logs_tqBF.zip

Thank you,

Robertson

[Brian Valente]

Hi Robertson

Overall your results look quite good. So the first thing I suggest (especially for a new mount) is look at your image results. If you are happy with them, I would probably spend some time imaging and getting familiar with the mount. Then you can decide if things need fiddling

Regarding your two questions:

>>>The Log File Viewer indicates Polar Alignment Error: 2.8’. Is that generally within acceptable limits or should I try to refine that some more?

It looks like PHD is handling your PA misalignment pretty well. It does show your Dec corrections are all in one direction, so it's possible to improve your polar alignment and you may have modest gains there, but it doesn't look like a constraint to your performance

Her's the Dec corrections, all in one direction (sample from your log)

>>>Second question, while running guide assistant the RA line shows a repeated oscillation. I’m I correct that that is periodic error? PEC correction is my next

That is correct, it is periodic error. Assuming your mount's worm period is about 244 seconds, it appears your PE is about 3" point to point

So yes, you could do PEC and it would help a bit. 

However, your residual error (the stuff that can't be guided out) appears to show a roughly 57 second error that is the largest unguidable error. Usually errors this small relate to portions of your mount's gearing, belts, etc. so it may be something to look at with other MyT owners or run by Bisque. 

otherwise looks like some nice guiding results

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Brian 

Brian Valente

portfolio brianvalentephotography.com 

[robertson...@gmail.com]

Thank you Brian, 

That's very encouraging.

Roberson