They are separated by 0.2 arcseconds or less (5 astronomical units) and the companion has not been observed directly. The two components are believed to have an orbital period of only a few tens of years. As they orbit, the two components come within 95 astronomical units of each other and drift as far apart as 195 astronomical units.Įpsilon 2 Lyrae A was discovered to be a binary system using speckle interferometry in 1985. The physical distance between the stars is 145 astronomical units. Their orbital period is 724.307 years, less than half that of Epsilon 1. They appear 2.3 arcseconds apart and have apparent magnitudes of 5.1 and 5.5. The components of Epsilon 2 Lyrae – Epsilon 2 Lyrae A and Epsilon 2 Lyrae B – are a bit closer to us, at a distance of 156 light years. The stars have a highly eccentric orbit that brings them as close together as 73 astronomical units and takes them as far apart as 400 astronomical units. The physical distance between them is about 140 astronomical units. The two stars complete an orbit every 1,804.41 years. They have apparent magnitudes of 4.7 and 6.2 and shine at a combined magnitude of 4.66 from a distance of 162 light years. The components of Epsilon 1 Lyrae – Epsilon 1 Lyrae A and Epsilon 1 Lyrae B – are separated by about 2.6 arcseconds. In telescopes, each of the components is resolved into a pair of stars in close orbit, earning the system the nickname Double Double.
The two components are over 0.16 light years (10,500 astronomical units) apart and orbit each other with a period of over 400,000 years. Epsilon 1 appears 208 arcseconds north of the slightly brighter Epsilon 2. They are designated Epsilon 1 Lyrae and Epsilon 2 Lyrae. In good conditions, two components are visible to the unaided eye. Star systemĮpsilon Lyrae is a star system consisting of five or more stars. Telescopes resolve each component into a pair of white stars, making the Double Double a popular target among both stargazers and astronomers. The two brightest components, Epsilon 1 Lyrae and Epsilon 2 Lyrae, have apparent magnitudes of 4.66 and 4.59 and are visible without binoculars from areas without light-pollution. Composed of at least five stars, the system lies at an approximate distance of 160 light years from Earth. Epsilon Lyrae, popularly known as the Double Double, is a multiple star system located in the constellation Lyra.
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