Alpha Serpentis

Location of α Serpentis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 15
Declination +06° 25′ 32.2633″
Apparent magnitude (V) 2.623
Characteristics
Spectral type K2 III
U−B color index +1.248
B−V color index +1.167
Astrometry
Radial velocity (Rv) +2.63 km/s
Proper motion (μ) RA: +133.84 mas/yr
Parallax (π) 44.10 ± 0.19mas
Distance 74.0 ± 0.3 ly
(22.68 ± 0.10 pc)
Absolute magnitude (MV) +0.88 ± 0.03
Details
Radius 12R
Luminosity 70L
Surface gravity (log g) 2.5
Temperature 4,498K
Metallicity [Fe/H] 0.03dex
Rotational velocity (v sin i) 4.3 km/s
Other designations
Unukalhai, Cor Serpentis, 24 Serpentis, HR 5854, HD 140573, SAO 121157, HIP 77070, ADS 9765, CCDM 15442+0626.

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Unukalhai, which is released under the Creative Commons Attribution-Share-Alike License 3.0