Anyway, these images are from observations of NGC 2371. The hover images are both WFPC2 data and they are 12 years apart, the first being from 1995 and the second from 2007. I'm sure it's not some kind of artifact. It's also present in some raw ACS/WFC data from 2009 which I'm not sure whether it's corrected for geometric distortion but I included the image anyway with it lined up as best I could. Not a lot of movement between the 2007 and 2009 observations.
I thought it could be some kind of trans-Neptunian object but when I compared it to those I realized it moves a lot more slowly. So maybe it is just a nearby star and the movement is just parallax. I'm sure the HLA is full of hopelessly dim little oddities like this.
WFPC2 ACS/WFC
![Image](http://geckzilla.com/astro/NGC2371_crop_2009.jpg)