Platesolve fails near celestial NP

[Rudi]

The other day I was going close to the celestial north pole, and found, that Astroart couldn't platesolve.

Horizontal field = 93.6 arc minutes
Pixel resolution = 1.2 arcsec per pixel
The fit file:
https://www.dropbox.com/s/gjn5bdo21a0aa ... e.fit?dl=0

All my settings in Astroart regardi ng star detection are fine, any other fit solves perfectly.

I even tried expanding ra/dec limits to make a blind solve (size ra = 360 and size dec = 180), but no luck.

Having an idea about the math behind, I could imagine, that an image containing the celestial NP could cause some challenges.

Any suggestions how to make Astroart platesolve this?

[fabdev]

I checked, you're correct, plate solve is not possible near the poles (Dec > ~89). It will be fixed in Service Pack 6 available next month. The problem was indeed the singularity of the pole coordinates.
If you need the prerelease now, let me know by email or PM.
Thanks, Fabio.

[Rudi]

Thanks for the quick reply Fabio

No rush, I’ll just wait for the next SP

[Rudi]

Solves fine now with SP6 - thanks!