Gordon_R
Honorary Master
https://www.cnet.com/news/asteroid-suddenly-shows-off-a-comet-like-tail/
Reference: https://en.wikipedia.org/wiki/6478_Gault
An asteroid discovered decades ago may have become a comet in recent months, according to telescope observations that spotted a tail accompanying the space rock.
The newly intriguing object is named Asteroid (6478) Gault, and observations from December and early January show it has developed a tail.
"A possible scenario is that there was a collision between Gault and another object, releasing material into space, that we see like a tail/trail," astronomer Gianluca Masi said in a blog post for the Virtual Telescope Project, which managed to catch the object with its Italy-based telescope.
Reference: https://en.wikipedia.org/wiki/6478_Gault