This autumn, Earth will briefly have a second “mini moon.” An asteroid, roughly the size of a city bus, will be temporarily captured by Earth’s gravity from 29 September to 25 November.
This asteroid, originating from the Arjuna asteroid belt, follows an orbit similar to Earth’s. Some of these asteroids can come relatively close to Earth, around 2.8 million miles away, and if moving slowly enough, can be temporarily caught by Earth’s gravity.
The asteroid, traveling at about 2,200 mph, will not complete a full orbit but will stay near Earth for two months before returning to its orbit around the sun.
Discovered on 7 August by NASA’s Asteroid Terrestrial-Impact Last Alert System (ATLAS), it measures around 10 meters long, much smaller than Earth’s permanent moon.
Although it will be too small and dim for amateur telescopes, professional astronomers will be able to observe it. Researchers also expect this mini moon to return in 2055, noting that Earth has had similar mini moons in 1981 and 2022.
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