Stephenson 2-18 (also called Stephenson 2 DFK 1 or RSGC2-01) is an extreme red hypergiant star in the constellation Scutum. Stephenson 2-18 is the largest confirmed star with an unconfirmed radius, as a 2020 estimate placed it at 2,150 Solar Radii. It is one of the most luminous stars known.
Astronomical data
Radius (in Solar Radii): ~1,300 R☉
Diameter (in Kilometers): 1,809,600,000 km
Distance (in Light Years): 18,900 ly
Spectral type: M5 (Red)
2020 Estimate
Radius (in Solar Radii): 2,150 R☉
Diameter (in Kilometers): 2,992,800,000 km
I never knew this star existed. So awesome to discover this exists. Thanks for sharing.
Yeah, there are other stars that carry that name. And a lot of kids on YouTube still think this is the largest star, and I have to correct them.
As of now, I don’t correct the little ones anymore.