2018 AG37

2018 AG37 is a distant trans-Neptunian object and centaur that was discovered 132.2 ± 1.5 AU (19.78 ± 0.22 billion km) from the Sun, farther than any other currently observable known object in the Solar System. It was discovered by Scott Sheppard, David Tholen, and Chad Trujillo on 15 January 2018, during a search for hypothetical planets beyond Neptune. The confirmation of this object was announced in a press release in February 2021. It was nicknamed "FarFarOut" to emphasize its distance from the Sun. 2018 AG37 was discovered when it was near aphelion, the farthest point from the Sun in its elliptical orbit. The object is estimated to be at least 400 km (250 mi) in diameter. Because of its extreme distance, 2018 AG37 appears extremely faint with an apparent magnitude of 25—only visible to the largest telescopes in the world.