OTS 44: Least Massive Star Discovered Yet (Fact of the Day)

Relative size of the Brown Dwarf system to our Solar system (Artist's conception)
OTS 44 is a brown dwarf which is about 550 light years away in the constellation of Chamaeleon. A brown dwarf is a cool or "failed" star, where it does not have the mass to ignite the hydrogen fusion reactions at the core of the star. It is smallest known brown dwarf and the least massive star ever discovered. It has 15 times the mass of Jupiter and only 1.5% of the mass of the Sun. The radius of OTS 44 is about one-fourth the radius of our Sun.

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