Unpopular Astronomy Object of the Week: Earth’s “Other Moons”
Isn’t it amazing that Earth seems to be the only planet with only 1 moon? Well apparently, that’s false.
Earth has short-lived satellites, or "Mini-Moons".
A brief history on the discovery of Mini-Moons: In 2006, the Catalina Sky Survey of Arizona found an object orbiting Earth, a natural satellite other then the moon. It was named 2006 RH120, it was a tiny asteroid, but it fit the definition of a moon. But by June 2007, it was gone.
At least it was a rare isolated event, right? Wrong. It turns out, at any given moment, Earth has a natural satellite (other than the Moon) that is about 1 meter in diameter.
Also, if Mini-Moons aren’t enough, there are objects called "Quasi-satellites" that don’t exactly meet the qualifications for a moon or natural satellite. A example of a Quasi-satellite is Cruithne, which some people (incorrectly) call it Earth’s “Second Moon”.
this is interesting. Can anyone explain how the small object holds an orbit or rather, what gravitational force it is orbiting about?