New Neighbors in the Sky: Earth's Rare Mini-Moon Encounter

A world where Earth's single, constant moon isn't alone. For the next two months, a tiny asteroid will join our planet's orbit, making it one of the rare "mini-moons" we've seen. This tiny visitor, called 2024 PT5, is just 33 feet wide and won't be bright enough to see with the naked eye or a small telescope. But its presence is a rare treat for astronomers and space enthusiasts. The asteroid was discovered in August by a NASA-funded asteroid detection system and a South African observatory. Scientists believe 2024 PT5 came from the Arjuna asteroid belt, a group of small rocks near Earth that was discovered in the early 1990s. Its journey began when Earth's gravity pulled it in, and it will make one loop around our planet before leaving on November 25.Earth has captured asteroids before, but these mini-moons are special because they complete a full orbit around our planet. In the past, some asteroids have flown by without circling Earth, but 2024 PT5 will be a short-timer compared to others. For example, a visitor called RH120 stayed in orbit for a year before leaving in 2007. Astronomers are excited to study this rare occurrence, and scientists are always on the lookout for new moons in our solar system. There are almost 300 moons orbiting the eight planets and Pluto, and new ones are constantly being discovered as survey methods improve.