Yes, “don’t mind” that skewing … it has to do with the display engine and is due to a integer rounding problem in the zoom out (I know about it for a while … I just haven’t got to fix it yet as well as many other small bugs). If you zoom in you will see that error doesn’t propagate, see bellow another screenshot:
larryo.org/tmp/m13_solved_z1.jpg
Another thing here to mention is that the shapes of the stars (the marks) you see are these detected from the image not generated from the catalog… so some shift in some cases could be due to image distortion(comma/tracking/etc) since I do a median of the centroid.
Yes, I do calculate residuals and yes I take in account position, timing, atmospheric refraction, etc. And, yes, there is still work left to be done for image/plate distortion correction – but then again you can only do that properly if you have complete specification of your instruments as well as precise measurements on environmental changes. You mean 0”.2 rms with an amateur setup ? As far as I recall that will be a target for a pro .. or maybe I am wrong.
Apart from all this, are not the stars mapped/named correctly?
Again, I don’t advertise this as a research grade software, and maybe not yet or maybe not ever – for now my project is already too big and already makes it difficult for me to follow the entire whole code (a 300k+ lines of code) … I wanted to have a complete set of tools/pointers for the amateur astronomer and once I get this stable look it into improving it module by module. Also, this first version to release it will be a pre-alpha (not even beta) and I know there are and will be lots to fix and improve.
Larry
