15.26
Apparent Mag19,000
Distance (ly)M6Ia
Spectral Type3,200
Temperature (K)Stephenson 2-18 may be the largest known star by radius at over 2,000 solar radii. It is a red supergiant in the Stephenson 2 cluster.
Stellar Data
Apparent Magnitude15.26
Absolute Magnitude-8.4
Distance19,000 light-years
Spectral TypeM6Ia
Temperature3,200 K
Luminosity630,000 L☉
Radius2150 R☉
Mass12 M☉
Right Ascension18h 39m 02.4s
Declination-06° 05′ 10.5″
ConstellationScutum
Notable Facts
- Stephenson 2-18 may have the largest radius of any known star
- Its radius exceeds 2,000 solar radii
- It would extend beyond Saturn's orbit if placed at the Sun