Sun Compared to Stephenson 2-18: The New Largest Known Star, Bigger than UY Scuti • (2K) • 2021

Sun Compared to Stephenson 2-18: The New Largest Known Star, Bigger than UY Scuti • (2K) • 2021 Stephenson 2-18 ( RSGC2-18 / Stephenson 2-DFK 1 ), is a red supergiant (RSG) star within the open cluster Stephenson 2 located around 19,500 light years away in the constellation of Scutum. Stephenson 2-18 Radius ~2,150 x Sun radius ( billion km, 928 million mi) Distance from the sun ~19,560 Light years Luminosity ~440,000 Sun x Luminosity Surface temperature ~2,900 °C (5,252 °F) Mass unknown