Does Earth Have a New Quasi-moon?

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https://skyandtelescope.org/astronomy-news/does-earth-have-new-quasi-moon/

By David Chandler, Sky & Telescope Magazine. 

Excerpt: Recently discovered asteroid 2023 FW13 has created a bit of a stir among asteroid watchers. It turns out to be on an orbit that is not only in a 1:1 resonance with the Earth, but follows a path that actually circles Earth — albeit on an orbit that is so eccentric that it sweeps out halfway to Mars and in halfway to Venus. There’s no formal definition for objects such as this, which are sometimes called quasi-moons or quasi-satellites. They follow a path around Earth, but usually for no more than a few decades. Perhaps the best known of these objects, known as Kamoʻoalewa, was found in 2016, and is considered the smallest, closest, and most stable known quasi-satellite. It has an orbit that has been in a stable resonance with Earth for almost a century, and will remain so for centuries to come, according to calculations by Paul Chodas (Jet Propulsion Laboratory). But this newfound asteroid, if preliminary orbital calculations are correct, will handily eclipse that record. Some estimates say it has circled Earth since at least 100 BC and will likely continue to do so until around AD 3700. If that’s correct, 2023 FW13 would be the most stable quasi-satellite of Earth ever found.... 

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