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Delta Equulei

The double of two sunlike yellow stars was until sometime in the 20th century the closest known double star which could be separated optically.
Star A itself is in turn a very close double. For its two components there are no separated dates available yet.

Constellation: Equuleus
Age: 1.6 - 2.8 billion years
Distance: 60.3 light-years
Space between Delta Equulei A and B: 4.81 AU
Orbit period of Delta Equulei A and B: 5.7 years

Delta Equulei Aa and Ab combined

Spectral class: F5
Visual magnitude: 5.11
Luminosity: 2.23 * Sun
Mass: 1.22 * Sun
Diameter: 2.38 * Sun

Delta Equulei B

Spectral class: G0
Visual magnitude: 5.40
Luminosity: 2.17 * Sun
Mass: 1.17 * Sun
Diameter: 1.05 * Sun

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    Delta Equulei
Photo: ESO Online Digitized Sky Survey

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