So 'asteroid' 2020 SO was actually 1960s space junk. It may be the first of many to come.

The detective story of 2020 SO, an erstwhile asteroid now formally identified as a 54-year-old piece of space junk, sounds like a wild yarn today but may become the first installment in a long series.

Source : https://www.space.com/2020-so-space-junk-asteroid-lessons