UY Scuti is a bright red supergiant and pulsating variable star in the constellation Scutum. It is a current and leading candidate for being the largest known star by radius and is also one of the most luminous of its kind.

UY Scuti size comparison to the sun
Mass 7-10[4] M
Radius 1,708 ± 192[4] R
Luminosity 340,000[4] L
Surface gravity (log g) −0.5[4] cgs
Temperature 3,365 ± 134[4] K