Newfound ‘Quasi-Moon’ Has Been Earth’s Fellow Traveler for Thousands of Years

2023 FW13 was first observed in March by the Pan-STARRS observatory, which is located atop the volcanic mountain Haleakalā in Hawaii. The asteroid’s existence was then confirmed by the Canada-France-Hawaii Telescope in Hawaii and two observatories in Arizona before being officially listed on April 1 by the Minor Planet Center at the International Astronomical Union, a network of scientists responsible for designating new planets, moons and other objects in the solar system.

Some estimates suggest that 2023 FW13 has been Earth’s cosmic neighbor since at least 100 B.C. and that the space rock will continue to follow this orbital path until around A.D. 3700, Adrien Coffinet, an astronomer and journalist who first categorized the asteroid as a quasi-moon after modeling its orbit, told Sky & Telescope.

“It seems to be the longest quasi-satellite of Earth known to date,” Coffinet said.

Following 2023 FW13’s initial discovery in March, space observers dug into the data and found observations of the asteroid dating all the way back to 2012, according to Live Science’s sister site Space.com. 

Despite hovering relatively close to Earth, this quasi-satellite likely isn’t on a collision course with our planet. 

“The good news is, such an orbit doesn’t result in an impacting trajectory ‘out of the blue,'” Alan Harris, an astronomer at the Space Science Institute, told Sky & Telescope. 

This is not Earth’s only quasi-companion; a different quasi-satellite known as Kamo’oalewa was discovered in 2016. The rock sticks similarly close to our planet during its orbit around the sun, and a 2021 study suggested that this asteroid could actually be a fragment of Earth’s moon. 

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