Earth will temporarily get a second moon next week when a tiny asteroid begins its two month orbit around the planet, though researchers say the space rock likely won’t be visible without the help of a professional telescope.

The asteroid was discovered in August and is set to become a mini-moon, spinning around Earth in a horseshoe shape for about two months.

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.