A Yellow Hypergiant

Yellow SupergiantHR 5171, the brightest star near the middle of this wide-field image, is a yellow hypergiant. Hypergiants are a very rare type of star; only a dozen are known in our galaxy. HR 5171 is over 1300 times the size of the Sun, making it one of the ten largest stars found to date. Observations with ESO’s Very Large Telescope Interferometer have shown that it is actually a double star, with its companion so close that it’s in contact with the main star.

Credit: ESO / Digitized Sky Survey 2

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