Spectral TypeM4 Ia
Temperature3,365 K
Contender A
UY Scuti
M4 Ia
VS
Spectral TypeM6 Ia
Temperature3,200 K
Contender B
Stephenson 2-18
M6 Ia
Radius
R☉
UY Scuti1,700
Stephenson 2-182,150
Stephenson 2-18 is 1.3x higher
Mass
M☉
UY Scuti7
Stephenson 2-1835
Stephenson 2-18 is 5x higher
Temperature
K
UY Scuti3,365
Stephenson 2-183,200
UY Scuti is 1.1x higher
Luminosity
L☉
UY Scuti340,000
Stephenson 2-18440,000
Stephenson 2-18 is 1.3x higher
Distance
ly
UY Scuti9,500 ly
Stephenson 2-1819,000 ly
UY Scuti is 2x lower
Brightness
mag
UY Scuti8.29
Stephenson 2-1815.00
UY Scuti is 1.8x lower