VY Canis Majoris compared to its original main-sequence form

VY Canis Majoris (VY CMa) is a red hypergiant star located in the constellation Canis Major. It is a high-luminosity M star with an effective temperature between 3,000 and 3,490 K. During its main sequence, it would have been an O-type star with a mass of 25 solar mass. The diameter of VY CMa is estimated at 1,420 to 2,200 solar radii (3,064,124,800 km); this would make it the largest star ever known.[1] It has a luminosity between 270,000 and 350,000 solar luminosity and a mass of 17 ± 8 solar masses.

Diameter 3,064,124,800 km
Temperature 2,727 °C
Mass 17x Sun
Spectral type M2.5 0
Apparent Magnitude +7.96
Gravity 0.8913 m/s2
Constellation Canis Major

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