开云体育

Very good tutorial, Brian!

Wanted to mention that variations of a few 1/100s of an arcsecond in pixel scale between predicted and measured are really insignificant. In most cases this is way smaller than the error introduced in an astrometry solution by the position errors in the star catalog, seeing conditions, and tracking/guiding. Even a tiny difference in distance between the reducer and the sensor can result in a much larger image scale change, so best not to obsess over getting it right to more than 1 decimal place, especially for PEC training :)

Regards,

? ? -Paul