What causes these kinds of artifacts?

They’re certainly colorful!

These are from a part of the NOAO Community Pipeline that tries to detect satellites and other long, streaky objects. It often detects large galaxies and masks them.

Thanks! :slight_smile:

Is there an easy way to see such affected galaxies in their original glory?

You can try looking at the Single Image Cutouts.

In DR8 we (mostly) fixed this.