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α Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Serpens
Right ascension 15h 44m 16.1s
Declination +06° 25' 32"
Apparent magnitude (V) +2.63
Distance 73.2 ± 1.2 ly
(22.5 ± 0.4 pc)
Spectral type K2III
Other designations
Unukalhai, Cor Serpentis,
24 Serpentis, HR 5854,
HD 140573, SAO 121157,
HIP 77070, ADS 9765,
CCDM 15442+0626

Alpha Serpentis (α Ser / α Serpentis) is a triple star system in the constellation Serpens, in its head (Serpens Caput). Alpha Serpentis has the traditional names Unukalhai, from the Arabic عنق الحية ‘unuq al-ħayyah "neck of the snake", and its Latin translation, Cor Serpentis "heart of the snake". Alpha Serpentis is approximately 73.2 light years from Earth. Alpha Serpentis is the brightest star in the Serpens Constellation.

The primary star, Alpha Serpentis A is an orange K-type giant with an apparent magnitude of +2.63. It has a total luminosity of 70 times solar and a surface temperature of 4300 kelvins. The radius of the star is some 15 times as large as that of the Sun. The magnitude +11.8 Alpha Serpentis B is 58 arcseconds from the primary, and the 13th magnitude Alpha Serpentis C lies 2.3 arcminutes from A.

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