Interesting object

What’s this? It is close to the end of the image, and possibly a glitch? But looks very cool

Probably an internal reflection in the telescope. Definitely an artifact and not a real astrophysical phenomenon.

Yep, you’ll find that feature a lot in the HSC images; it must be some kind of ghost (internal reflection), possibly from a bright star. We don’t have the individual HSC exposures so it’s not trivial to track down exactly where it’s coming from.