Passage of an asteroid

https://www.legacysurvey.org//viewer/?ra=213.2594&dec=53.0567&layer=hsc-dr2&zoom=12

If you look in the browser at this area, you can see multiple images of a passing asteroid showing up in green.

Hi. The strange thing is that are very similar on all bright stars, I suggest artifacts

No, you need to go to the viewer, then zoom out. You will see a string of green dots that are images of a passing asteroid taken from each of the overlaid exposures.

Could you post a specific link for this ?

Just click on the link below the image above and it will open the browser at that location. You can actually see the row of green dots in the thumbnail image, but it is easier to see them if you can zoom in and out.