NOTABLE STARS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z           HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site Epsilon Lyrae The fifth brightest star in the constellation Lyra and one of the most famous multiple stars in the sky: a naked-eye double (on a very clear, moonless night) that a 6-cm telescope with high magnification shows to be a quadruple system made up of two pairs of stars; it is commonly known as the Double Double. Epsilon1 consists of two stars, of magnitude 4.7 and 6.2 magnitude, that orbit about their center of gravity every 1,200 years. Epsilon2 consists of a magnitude 5.1 and 5.5 pair with an orbital period of 585 years. In addition Epsilon1 and Epsilon2 orbit around each other in a huge orbit, with a separation of 0.16 light-year and a period measured in hundreds of thousands of years. visual magnitude 4.67 (Eps1), 4.59 (Eps2) absolute magnitude 1.18 (Eps1), 1.10 (Eps2) spectral type F1V (Eps1), A8V (Eps2) distance 162 light-years position R.A. 18h 44m 18.5s, Dec. +39° 40' 13" other designations SAO 67315, GSC 3122:3439, HIP 91926, B+39 3510 Related categories    • NOTABLE STARS    • VARIABLE STARS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History BACK TO TOP