That’s no moon. But we’ll take it.
Turns out our moon has a new sibling.
This new moon has been dancing around for over a century now. Its orbit is extremely elliptical, affecting it to go a wee bit off tangent—between 38 and 100 times the distance of Earth’s primary moon—and bob up and down across Earth’s orbital plane. This new moon is tilted by about 8° and it orbits the Sun for 365.93 days, which is a little longer than Earth’s 365.24 day-long year.