HD 140283, informally nicknamed Methuselah star,[4] is a metal-poor subgiant star about 190 light years away from the Earth in the constellation Libra.[1][2] Its apparent magnitude is 7.223.[1] The star has been known to astronomers for over a century as a high-velocity star, and an early spectroscopic analysis by Chamberlain and Aller found it to have a substantially lower metal content than the Sun.[5] Modern spectroscopic analyses find an iron content about a factor of 250 lower than that of the Sun. It is one of the closest Population II stars to us.