hip-103089

Hot blue star

Its story

57 Cygni hides inside the Swan some 525 light-years away, yet it is not one star but two: a near-twin pair of B5 blue suns swinging through an orbit shorter than three days. So close, so fast that only the splitting of their spectral lines gives them away. The light we read as a single point is in truth the combined pulse of a duet.

Constellation: Cygnus
Apparent magnitude: 4.80
Distance: 525.3 light years
Coordinates (J2000): RA 313.311° · Dec 44.387°
Catalogue: HIP 103089 · HD 199081

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Symbolic commemorative gift — no ownership, no IAU recognition.