събота, 9 март 2013 г.

NML Cygni - Largest Star in the Universe

NML Cygni or V1489 Cygni is a red hypergiant star. It is the largest start discovered today in the universe the one that is bigger than the rest at about 1650 times the sun's radius, which is 7.67 a.u. It is one of the extreme luminous supergiant stars. Its distance from Earth is estimated to be around 1.6 kpc, or about 5,300 light-years. This star has a dusty environment surrounding it, and it exhibits a bean-shaped asymmetric nebula which is coincident with the distribution of its H2O vapor masers. It is a semiregular variable star with a period of around 940 days.

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