Accurate astrometry for images with super-wide fields of view

Cameras with a super-wide field of view, defined here as being at least 20 degrees on one side, are widely used in site testing and time-domain astronomy. However, they intrinsically require optics with non-linear projections, making it challenging to use traditional astrometric methods. We have developed a generalized astrometric method that is applicable to images with super-wide fields of view. We applied the method to images from an all-sky camera and obtained the astrometric solutions. The positional accuracy we achieve in analysing 5170 all-sky images is typically 0.4 pixels in $(x,y)$. Our method is a generalized method suitable for all images with super-wide fields of view.