3753 Cruithne - Earth's second Moon (orbit diagram)
Near-Earth Asteroid 3753 Cruithne,good
Asteroid 3753 Cruithne Earth's Second Moon
Horseshoe orbit - Video Learning - WizScience.com
3753 Cruithne Rotation
3753 Cruithne is a Q-type, Aten asteroid in orbit around the Sun in 1:1 orbital resonance with Earth, making it a co-orbital object. It is an asteroid that, relative to Earth, orbits the Sun in a bean-shaped orbit that effectively describes a horseshoe, and that can transition into a quasi-satellite orbit. Cruithne does not orbit Earth and at times it is on the other side of the Sun, placing Cruithne well outside of Earth's Hill sphere. Its orbit takes it inside the orbit of Mercury and outside the orbit of Mars. Cruithne orbits the Sun in about 1 year but it takes 770 years for the series to complete a horseshoe-shaped movement around the Earth.