Mer info:
Asteroid 2023 DZ2 will pass 0.5 lunar distance (half the Earth-moon distance) from Earth’s surface. The relative closeness will enable observers to see the space rock in six-inch (15cm) and larger diameter telescopes.
The space rock is traveling at a speed of 17,426 miles per hour (28,044 km/h), or 7.79 km/second, relative to Earth. While it sounds like a huge speed relative to what we’re familiar with on Earth, it’s a relatively slow asteroid in contrast to other space rocks that astronomers study.
https://earthsky.org/space/200-ft-as...than-the-moon/