 Originally thought to be a third-stage Saturn S-IVB booster from Apollo 12, it was later determined to be an asteroid and designated as .The asteroid re-entered solar orbit after 13 months and is expected to return to Earth orbit after 21 years.In April 2015, an object was discovered orbiting the Earth, and initially designated , but more detailed investigation quickly showed the object to be the "Gaia" spacecraft, and the object's discovery soon was retracted.