Earth will have a second “mini-moon” in addition to its regular lunar companion for about two months starting on Sept. 29, according to a recent study published in the journal Research Notes of the American Astronomical Society.

Here’s what to know about our new, temporary celestial neighbor. Earth has a large gravitational pull. So it’s not uncommon for objects flying through space to be attracted to it or get caught up in an orbit — at which point they earn status as miniature moons. The same happens with objects purposefully placed in space, such as satellites.