Close approach
Gateway Arch-sized asteroid 2020 XM1
28 LD · ~167 m
28 LD
lunar distances from Earth
10,694,008 km
distance from Earth’s center
93–300 m
estimated diameter
Gateway Arch
roughly the size of
2020 XM1 · ~167 mGateway Arch · 192 m
100 m
Drawn to scale.
2020 XM1 passes about 28× the distance to the Moon from Earth (10,694,008 km). It is 93–300 m across (estimated). If a rock this size hit Earth, the result would be destruction across a metropolitan region, with a crater kilometers wide — or a major tsunami from an ocean impact. This is a routine close approach with no known impact risk.
For the background, read Impact risk in Asteroids.
Get a heads-up on the next close approach
Asteroid Alerts sends a push when something worth seeing happens — a big fireball, a close asteroid pass, a meteor shower peak or an aurora storm. Free.
One email a week
What’s passing, what’s visible, what hit.