Lyra

Located 25 Light-years from our Sun, Vega (Alpha Lyrae) is the brightest star in the constellation of Lyra and is the 5th brightest star in the night sky. Though it was catalogued as multiple star in 1781 by John Herschel, it has now been determined that all components are non-physical optical associations.
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The colorful pair of stars Delta 1 & Delta 2 Lyra form the north-east corner of the Constellation of Lyra. The stars are only an optical association separated from each other by over 400 light-years.
The famous “Double – Double” in Lyra is a popular test of telescope optics. The Epsilon 1 – 2 pair can be resolved by the naked eye under good conditions while each star is itself a binary pair with closely matched separations of 2.3 & 2.4 arc seconds. Not only are the individual stars in each pair gravitationally bound to each other, the two pairs – separated by 0.16 light year – are also gravitationally bound.
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Commonly referred to as “The Other Double Double in Lyra” it is notable that the Position Angle of the two pairs are almost identical. Only the stars of STF 2474 are a true physical system.
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Located a short distance north of M57 (The Ring Nebula) is STT 525 a beautiful color contrasting pair. Sharing the view is STF 2421.
A close-up view of STT 525 showing the A-B pair resolved. The striking color contrast of the physical A-C pair is apparent.
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