Gamma Geminorum A

Location of γ Geminorum (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Gemini
Right ascension 06
Declination +16° 23′ 57.4095″
Apparent magnitude (V) 1.915
Characteristics
Spectral type A1 IV
U−B color index +0.137
B−V color index +0.005
Astrometry
Radial velocity (Rv) -12.5 km/s
Proper motion (μ) RA: +13.81 mas/yr
Parallax (π) 29.84 ± 2.23mas
Distance 109 ± 8 ly
(34 ± 3 pc)
Orbit
Period (P) 4,614.51 days
Eccentricity (e) 0.8933 ± 0.0013
Periastron epoch (T) 244399.13 ± 0.77
Argument of periastron (ω)
(secondary)
312.60 ± 0.60°
Semi-amplitude (K1)
(primary)
11.881 ± 0.068 km/s
Details
Mass 2.81M
Radius 3.3R
Luminosity 123L
Surface gravity (log g) 3.60
Temperature 9,260K
Metallicity [Fe/H] –0.12dex
Rotational velocity (v sin i) 15 km/s
Other designations
Alhena, 24 Geminorum, BD +16°1223, FK5 251, GCTP1539.00, HIP 31681, HD 47105, HR 2421, SAO 95912.

Get more info about Alhena in Wikipedia

This article uses material from the Wikipedia article
Alhena, which is released under the Creative Commons Attribution-Share-Alike License 3.0