ATLAS telescope discovers first-of-its-kind asteroid with a comet-like tail

We often think of asteroids and comets as distinct types of small bodies, but astronomers have discovered an increasing number of “crossovers.” These objects initially appear to be asteroids, and later develop activity, such as tails, that are typical of comets.

Source:
https://phys.org/news/2020-05-atlas-telescope-first-of-its-kind-asteroid-comet-like.html