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Astronomers say Earth has a new mini-moon, for now

An asteroid has been caught in our planet's gravity, but it'll float away soon.

Earth, as seen from the Moon in 1968, could have pulled a new mini-moon into its gravity.
Corbis via Getty Images

We have a new space neighbor, at least for a while. Astronomers at the NASA-funded Catalina Sky Survey spotted an asteroid that's caught in Earth's gravity, but the space agency's Center for Near-Earth Objects Studies noted that it's on its way out of our planet's orbit.

"Earth has a new temporarily captured object/Possible mini-moon called 2020 CD3. On the night of Feb. 15, my Catalina Sky Survey teammate Teddy Pruyne and I found a 20th magnitude object," Kacper Wierzchos tweeted Tuesday.

Wierzchos calculated that the asteroid is between 1.9 and 3.5 meters in diameter. The Minor Planet Center acknowledged the near-Earth object, and it apparently entered Earth's orbit around three years ago. The Catalina Sky Survey is based at the University of Arizona's Lunar and Planetary Lab in Tucson.

In an email confirming the CSS discovery, CNEOS scientist Shantanu Naidu noted that 2020 CD3 made its final close approach to Earth on Feb. 13 and is on its way out of Earth's gravitational influence.

"So far 2020 CD3 does not appear to be a part of some lost spacecraft hardware but there isn't enough data yet to rule that out," they noted. 

It's the second asteroid that's known to have entered Earth's orbit. The previous one, 2006 RH120, was also discovered by the CSS and orbited Earth for 18 months over 2006 and 2007, as noted by science writer Corey S. Powell.

First published Feb. 26 at 4:35 a.m. PT.
Updated 5:14 a.m. PT: Adds more detail. 7:08 a.m. PT: Corrects diameter from miles to meters. 
Update, Feb. 27, 2:33 a.m. PT: Adds CNEOS comment.

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