NML Cygni
NML Cygni or V1489 Cygni is a red hypergiant star. It is one of the largest stars known at present. One study says its radius is 1,640 times the Sun's radius (solar radii), but an older study from 2010 says its radius is only 1,183 solar radii. It is one of the brightest supergiant stars. It was discovered in 1965, by Gerry Neugebauer, D.M. Martz and Robert Leighton. The name 'NML' comes from the names of the three discoverers.