Alpha Serpentis
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| Observation data Epoch 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 | |
Alpha Serpentis (α Ser / α Serpentis) is a triple star system in the constellation Serpens. Alpha Serpentis also has the traditional names Unukalhai (Unukalhay, Unuk al Hay, Unuk Elhai, Unuk), from the Arabic عنق الحية cunuq[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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