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Proper Names	Alya, Cauda Serpentis
Bayer Designation	Theta¹ Serpentis
Flamsteed Number	63 Serpentis
HR (BSC)	7141
HD	175638
Constellation	Serpens (Cauda)
Right Ascension	18h 56m 13s
Declination	+4° 12' 13"
Distance	131 light years 40 parsecs
Magnitude	Apparent: +4.6 Absolute: +1.6
Spectral Class	A5 White Main Sequence Star
Optimum Visibility	July
Notes	Alya 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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