I investigated diff_id 65024, skycell 1383.111 to find out some of the causes of the false Mops Detections.

The following is a rough count of the different classifications of detections:

type	number
burntool	49
cosmic ray	20
star wing	88
star core	37
"ok"	40

"ok" is misleading. "ok" refers to things that look like stars - and some might be real things, but most are not. I did not investigate further. Most, when I investigated further, ended up being cosmic rays that were convolved into roundish stars.

Here are some examples from each of the categories.

Burntool

There are 4 detections on this burn.

Cosmic ray hit

There are 2 cosmic rays here, each resulting in a detection.

Star wings

2 bright stars, the wings are detected (also, a burntool in the far right)

Star cores

These are subtractions that are not quite lined up.

"OK"

Sometimes these are real, most of the time these are actually not real (if you look at the warps).