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Alya

Cauda Serpentis, Theta1 Serpentis, 63 Serpentis

Proper NameAlya, Cauda Serpentis
Bayer DesignationTheta1 Serpentis
Flamsteed Number63 Serpentis
HR (BSC)7141
HD175638
ConstellationSerpens (Cauda)
Right Ascension18h 56m 13s
Declination+4° 12' 13"
Distance132 light years
40 parsecs
MagnitudeApparent: +4.6
Absolute: +1.6
Spectral ClassA5 White Main Sequence Star
Optimum VisibilityJune
NotesAlya marks the tip of the tail of Serpens the Serpent (and is indeed sometimes called Cauda Serpentis, the Serpent's Tail). This a binary system, composed of a pair of white stars orbiting each other at a distance of some 900 Astronomical Units.

More than 130 light years from Earth, Alya is part of an optical double star in the constellation of Serpens, on the borders of Aquila.

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