NML Cygni
Star
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NML Cygni or V1489 Cygni is a red hypergiant or red supergiant in the constellation Cygnus. It is possibly one of the largest known stars currently known by radius, and is also possibly one of the most luminous and massive cool hypergiants, as... Wikipedia
Radius: 709 million mi (1,640 R☉)
Mass: 9.945 × 10^31 kg (50 M☉)
Constellation: Cygnus
Luminosity: 272,000 L☉
Spectral type: M4.5-M7.9Ia-III
Magnitude: 16.6
Age: 8.005 million years