Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Eta Leonis is a fourth-magnitude star in the constellation Leo. Eta Leonis is a white supergiant with the stellar classification A0Ib. Though its apparent magnitude is 3.51, making it a relatively dim star to the naked eye, it is 5,600 times more luminous than the Sun, with an absolute magnitude of -5.60. The Hipparcos astrometric data has estimated the distance of Eta Leonis to be roughly 700 parsecs from Earth, or 2,000 light years away.