RMC 136a1 has the highest mass and luminosity of any known star, at 315 M☉ and 8.7 million L☉, and is also one of the hottest, at around 53,000 K. It is a Wolf–Rayet star at the center of R136, the central concentration of stars of the large NGC 2070 open cluster in the Tarantula Nebula.

Mass: 5.271 × 10^32 kg (265 M☉)

Surface temperature: 50,000 K

Radius: 13.049 million mi

Luminosity (visual, L_V): 150,000 L_☉

Surface gravity (log g): 4.0 cgs

Did you know: R136a1 is the heaviest star, with 265 times the sun's mass.