Re: Centroid Error

Posted by karenacollins on Sep 10, 2016; 6:59am
URL: http://astroimagej.170.s1.nabble.com/Centroid-Error-tp503p505.html

Hi Max,

Are the images properly calibrated? In other words, does the background
happen to have negative values? If so, the centroid will not work. In
that case, re-calibrate the images with appropriate bias, and/or darks,
and/or flats. If this is not the problem, please post an example of a
screen shot showing the aperture T1 placement on the star. Also post the
Sky/Pixel_T1 value from the measurements table for that image and
aperture number.

Karen