The asteroid Bennu last passed by Earth on September 23, 1999. During this close approach, it came within approximately 0.003 astronomical units (AU) of our planet, which is about 300,000 miles (480,000 kilometers). Bennu's close encounters with Earth are closely monitored by scientists due to its potential as a Near-Earth Object (NEO) and its potential impact hazard. It's also the target of NASA's OSIRIS-REx mission, which collected a sample from Bennu and is returning it to Earth.
If you are interested, we have made a YouTube video about 101955 Bennu:
youtu.be/lgWNZJn34gw?si=Q-NyzMM15mfNMOh2