coordinates of the target/comparison stars

Posted by guy on Jul 04, 2017; 9:44pm
URL: http://astroimagej.170.s1.nabble.com/coordinates-of-the-target-comparison-stars-tp707.html

Hello,
I did a practice run using the calibrated WASP12b data series, everything seems to work OK, as described in the user guide, however one thing I presently do not understand :
How AIJ keeps track of the target/comparison stars for all the images ? through the pixel coordinates ? through the WCS coordinates if plate-solved images are used? does it recalculates the centroid of the stars for each new image before performing photometry ? does it allow a small translation and/or field rotation between two successive images ? if yes, of which amount ?
Thank you for your attention
Guy