Epsilon Lyrae (ε Lyr / ε Lyrae), commonly quoted as The Double Double, is a quadruple system approximately 162 light-years away in the constellation of Lyra. It can easily be separated into two components when viewed through binoculars, or even with the naked eye under excellent conditions. The northern star is called ε and the southern one is called ε; they both lie around 162 light years from Earth and orbit each other.

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  • Epsilon Lyrae (ε Lyr / ε Lyrae), commonly quoted as The Double Double, is a quadruple system approximately 162 light-years away in the constellation of Lyra. It can easily be separated into two components when viewed through binoculars, or even with the naked eye under excellent conditions. The northern star is called ε and the southern one is called ε; they both lie around 162 light years from Earth and orbit each other. When viewed at higher magnifications, both stars of the binary can be further split into binaries; that is, the system contains two binary stars orbiting each other. Being able to view the components of each is a common benchmark for the resolving power of telescopes, since the individual doubles are so close together: the stars of ε were 2.35 arc-seconds apart in 2006, those of ε were separated by about the same amount in that year. Since the first high-precision measurements of their orbit in the 1980s, both binaries have moved only a few degrees in position angle. The component stars of ε have magnitudes of 4.7 and 6.2 and have an orbital period that can only be crudely estimated at 1200 years, which places them at roughly 140 AU apart. The component stars of ε have magnitudes 5.1 and 5.5, and orbit in perhaps half that period. ε and ε themselves are no closer than 0.16 light years apart, and would take hundreds of thousands of years to complete an orbit. An observer at either pair would see the other pair shining with the light of a quarter Moon, less than a degree away from each other. A fifth component of this system, orbiting one of the ε pair, was detected by speckle interferometry in 1985 and confirmed in two subsequent observations. No orbit can be prepared from such limited data, but its rapid motion suggests a period of a few tens of years. Its maximum observed separation of 0.2 arc-seconds precludes direct visual observation.
  • Epsilon Lyrae (ε Lyrae, ε Lyr) on tunnettu kaksinkertainen kaksoistähti Lyyran tähtikuviossa. Tähteä sanotaan monesti εε tai ε, Lyraeksi.
  • ε Лиры (Эпсилон Лиры, ε Lyr / ε Lyrae) — кратная звезда с четырьмя компонентами. Это одна из самых хорошо изученных двойных звёзд. Два её компонента видны даже в бинокль. Северный компонент обычно называют Эпсилон 1 (ε), а южный компонент — Эпсилон 2 (ε²). Оба компонента, в свою очередь, состоят из двух звёзд. Все четыре звезды белого цвета, по спектральному классу похожие на Сириус. Орбитальный период ε и ε² составляет около 244 тысяч лет. Звёзды системы ε имеют орбитальный период 1200 лет, у системы ε² — 720 лет.
  • Epsilon Lyrae (ε Lyr / ε i Lyran) är en stjärna i stjärnbilden Lyran. Den är en dubbelstjärna som kan lätt upplösas i två komponenter, till och med blotta ögat. Med ett något kraftfullare teleskop upptäcker man att det två komponenterna själva är dubbelstjärnor. Systemet består alltså av fyra stjärnor.
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  • Epsilon Lyrae (ε Lyr / ε Lyrae), commonly quoted as The Double Double, is a quadruple system approximately 162 light-years away in the constellation of Lyra. It can easily be separated into two components when viewed through binoculars, or even with the naked eye under excellent conditions. The northern star is called ε and the southern one is called ε; they both lie around 162 light years from Earth and orbit each other.
  • Epsilon Lyrae (ε Lyrae, ε Lyr) on tunnettu kaksinkertainen kaksoistähti Lyyran tähtikuviossa. Tähteä sanotaan monesti εε tai ε, Lyraeksi.
  • ε Лиры (Эпсилон Лиры, ε Lyr / ε Lyrae) — кратная звезда с четырьмя компонентами. Это одна из самых хорошо изученных двойных звёзд. Два её компонента видны даже в бинокль. Северный компонент обычно называют Эпсилон 1 (ε), а южный компонент — Эпсилон 2 (ε²).
  • Epsilon Lyrae (ε Lyr / ε i Lyran) är en stjärna i stjärnbilden Lyran. Den är en dubbelstjärna som kan lätt upplösas i två komponenter, till och med blotta ögat. Med ett något kraftfullare teleskop upptäcker man att det två komponenterna själva är dubbelstjärnor. Systemet består alltså av fyra stjärnor.
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  • Эпсилон Лиры
  • Epsilon Lyrae
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