RAFGL 2139, aka IRC -10414, is a rare red hypergiant with a bow shock. The only large stars known to have a bow shock are the red supergiants Betelgeuse and Mu Cephei. RAFGL 2139 is also a runaway star. It has a diameter 1,200 times that of the Sun, a luminosity of 160,000 to 400,000 L☉, and a cool temperature of 3,300 K. It is between 6 and 10 million years old and is located 700 parsecs away from the Sun. It has a Wolf-Rayet companion star.
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