Rare Double Star

Wallpaper Description:

HR 5171, the brightest star just below the center of this image, is a yellow hypergiant, a very rare type of stars with only a dozen known in our galaxy. Its size is more than 1300 times that of the Sun--one of the ten lartgest stars found so far. Observations with ESO's Very Large Telescope Interferometer have shown that it is actually a double star, with the companion in contact with the main star.
Credit: ESO/Digitized Sky Survey 2