An asteroid the size of a school bus is set to zoom by the Earth on Tuesday, traveling several times faster than a speeding bullet.

The asteroid, named 2025 BS4, is said by NASA’s Jet Propulsion Laboratory to be roughly 22 feet in diameter, with JPL’s Center for Near-Earth Object Studies (CNEOS) estimated that it could be between 17 and 40 feet across.

The average American school bus is roughly 35 to 40 feet long, for reference.

The asteroid has a speed of 16.02 km/s, or about 35,835 mph, while the fastest bullets can only travel about 1,800 mph.

2025 BS4 is due to fly past our planet at a distance of about 511,000 miles, roughly twice the distance of the moon’s 238,900-mile orbit around our planet.

Asteroids in our solar system are mostly found in the asteroid belt between Mars and Jupiter. Occasionally, interactions with the gravity of the planets can cause an asteroid to be ejected from this reservoir, zooming into the inner solar system and in the vicinity of Earth.

“Space is three dimensional—whilst there are a huge number of comets and asteroids out there, most of them move on orbits that don’t perfectly intersect with that of the Earth—even if they do cross where our orbit is in terms of the distance from the Sun, they usually pass harmlessly well above or below the Earth,” Jonti Horner, an astrophysics professor at Australia’s University of Southern Queensland, told Newsweek.

Due to its proximity to the Earth, 2025 BS4 is classified as a near-Earth object (NEO), which are defined as objects that come within about 120 million miles of the sun, or 30 million miles of Earth.

Objects and asteroids that come within around 4.6 million miles of the Earth and have a diameter of at least 460 feet.

“A PHA is one that has an orbit intersecting the Earth’s orbit around the sun by less than 0.05 astronomical units (1 AU is the distance to the Sun), that’s just over 4.5 million miles,” Martin Barstow, a professor of astrophysics and space science at the University of Leicester in the U.K., previously told Newsweek.

“It also has to have an absolute brightness of 22.0 or less (lower values of the magnitude are brighter = larger objects), i.e. an asteroid (or comet) that would cause significant regional damage if it hit the Earth,” he said. “Not all NEOs are potentially hazardous, but all hazardous objects are NEOs.”

2025 BS4 is not large enough to be considered a PHA, however, so is only classified as an NEO. According to NASA, this asteroid has a 0.000013 chance of hitting us at any point in the future.

There are several other NEO asteroids making close fly-bys of the Earth over the next few days, including the 100-foot 2025 BH2 passing at a distance of 4,280,000 miles today, the 36-foot 2025 BF5 coming within 797,000 miles of us tomorrow, and the 51-foot 2025 BS2 missing us by 2,330,000 on Wednesday.

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