A Japanese Aerospace Exploration Agency spacecraft named DESTINY+ is
currently scheduled to launch in 2022.
It's mission is to fly by a large (~5-km) near-Earth asteroid designated
3200 Phaethon — "an unusual blue-toned, dust-producing asteroid thought to
be the source of the Geminid meteor stream — and other minor bodies that
might be associated with it."
Another NEO, designated 2005 UD, not only shares orbital characteristics with
3200 Phaethon but has similar distinctive physical properties as shown
by their spectroscopy and polarimetry.
Were 3200 Phaethon and 2005 UD split from the same parent?
DESTINY+ combined with ground-based observations hope to shed light on the question.
Story by Susanna Kohler on 19 June 2020 here :-
https://aasnova.org/2020/06/19/explo...rby-asteroids/