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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 17 Lyrae is a binary star system in the constellation Lyra, approximately 132 light years away from Earth. The main star, 17 Lyrae A, is a 5th magnitude white star of the spectral type F0V, meaning it has a surface temperature of about 7,500 kelvins. It is a dwarf star, like our Sun, yet brighter and hotter. Its companion, 17 Lyrae B, is a 9th magnitude star of an unknown spectral type. There was once thought to be a third star in the system, 17 Lyrae C, until it was evident that the star's parallax and proper motions were too different for it to be part of the system.