Alpha Serpentis
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
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 | |
Alpha Serpentis (α Ser / α Serpentis) is a triple star system in the constellation Serpens, in its head (Serpens Caput). Alpha Serpentis also has the traditional names Unukalhai (Unukalhay, Unuk al Hay, Unuk Elhai, Unuk), from the Arabic عنق الحية ʿunuq[u] al-ħayya[h] meaning "[the] neck", and Cor Serpentis, a Latin phrase meaning "the heart of the serpent". Alpha Serpentis is approximately 73.2 light years from Earth.
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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