Log results

[Don Waters]

https://openphdguiding.org/logs/dl/PHD2_logs_fs2z.zip

Would appreciate your suggestions.

It seems to me that I still have periodic error although I have run PEC on the mount. I will verify.

The DEC seems is drifting. I am correcting only one direction. Could I have the direction wrong?

Thank you.

(I also not that the RMS error is different on the screen shot than it is in the log.)

[Brian Valente]

Hi Don

Yes, you still have substantial PE in your RA, approx 20", so the PE process you used may not have worked correctly (or at all)

Regarding your Dec, I think you are correct that you are guiding in the wrong direction for those last runs.it shows no corrections 

in an earlier run on pier side east, you can see it's working as intended

however when your guidestar goes above the lock position, there are no corrections because that would require guides to the south

PS in the future it would help if you included the calibration run in your guidelogs

Brian

--
You received this message because you are subscribed to the Google Groups "Open PHD Guiding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to open-phd-guidi...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/open-phd-guiding/4faeb1b4-b8e3-42d6-a508-9095680ba27an%40googlegroups.com.

--

Brian 

Brian Valente

astronomy portfolio https://www.astrobin.com/users/bvalente/ 

[Bruce Waddington]

Declination drift reverses direction depending on the details of how you are mis-aligned on the celestial pole.  Do you have a permanent setup or do you set up and polar align each night?  If the former, you can look at the history of your guiding sessions and see the hour-angle of the mount when the drift direction changes.  Hour-angle is defined as the angular RA distance between the celestial meridian and the scope pointing position.  When you do a polar alignment, you can intentionally make most of the polar alignment error in altitude rather than azimuth.  If you do that, the direction of Dec reversal will occur when your target is close to the celestial meridian.

Bruce