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Beta1,2 Lyrae, 10 Lyrae

Proper NameSheliak
Bayer DesignationBeta1,2 Lyrae
Flamsteed Number10 Lyrae
HR (BSC)7106
Right Ascension18h 50m 5s
Declination+33° 21' 46"
Distance962 light years
295 parsecs
MagnitudeApparent: +3.51
Absolute: -3.84
Spectral ClassB9I blue Supergiant
Optimum VisibilityJuly

Imagery provided by Aladin sky atlas

This pair of two blue stars orbit each other in a period of about twelve days. As they pass across one another, as seen from Earth, they cause Sheliak's brightness to vary widely, by almost a full magnitude.


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