Re: Astrometry Settings Issue - Limit Max Peaks in 8-bit Images
Posted by
karenacollins on
Mar 27, 2021; 9:01am
URL: http://astroimagej.170.s1.nabble.com/Astrometry-Settings-Issue-Limit-Max-Peaks-in-8-bit-Images-tp1530p1533.html
Hi Matt,
Thanks for the image. After running a plate-solve on your image, I
realized what is causing the stars with greater than 250 peak counts
to be included in the plate-solve. As it turns out, the median
filter is applied before the max peak count cut, and I expect you
have that option enabled. If you really want to cut on the actually
pixel values, you can disable the median filter option and see that
the stars you circled are not included in the plate solve (i.e. will
have no blue circle). That said, the plate-solve seems to complete
fine with or without the brighter stars included.
This sequence of operations could be considered backwards, but it's
a limitation of the implementation because the median filter, if
enabled, needs to run before the source detection routine runs, so I
think we are stuck with the awkwardness, unless the median filter is
disabled.
Karen
On 3/26/2021 9:14 AM, mketi [via
AstroImageJ] wrote:
Hi Karen,
It looks like the forum environment does not accept FITS files, so
I'll send it to your email.
I've annotated the saturated objects that are circled in the plate
solve animation. Hopefully the annotations show up on other
computers, though I do see some entries in the FITS header. The
troubled plate solving setting is Limit Max Peaks = 250. I'll also
include a screenshot of everything that I used.
Thank you again!
Matt