Mu Geminorum

μ Geminorum
Location of μ Geminorum (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension 06h 22m 57.62686s[1]
Declination +22° 30′ 48.8979″[1]
Apparent magnitude (V) 2.75 - 3.02[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type M3 III[4]
U−B color index +1.924[5]
B−V color index +1.643[5]
Variable type LB[2]
Astrometry
Radial velocity (Rv)+54.38±0.24[6] km/s
Proper motion (μ) RA: +56.39[1] mas/yr
Dec.: –110.03[1] mas/yr
Parallax (π)14.08 ± 0.71 mas[1]
Distance230 ± 10 ly
(71 ± 4 pc)
Absolute magnitude (MV)−1.42[7]
Details
Mass1.9±0.5[8] M☉
Radius107.7[9] R☉
Luminosity1,692[10] L☉
Surface gravity (log g)0.82±0.09[11] cgs
Temperature3,643[8] K
Metallicity [Fe/H]−0.03±0.03[11] dex
Rotational velocity (v sin i)8.4[12] km/s
Other designations
Tejat, Mu Gem, μ Gem, 13 Geminorum, BD+22°1304, FK5 241, HD 44478, HIP 30343, HR 2286, SAO 78297, ADS 4990A, CCDM J06230+2230A, WDS J06230+2231A[13]
Database references
SIMBADdata

Mu Geminorum or μ Geminorum, formally named Tejat (/ˈtiːdʒət/),[14] is a single star in the northern constellation of Gemini. From parallax measurements obtained during the Hipparcos mission, it is roughly 230 light-years (71 parsecs) distant from the Sun.[1] The position of the star near the ecliptic means that it is subject to lunar occultations.[15]

Mu Geminorum forms the primary or 'A' component of a double star system designated WDS J06230+2231 along with UCAC2 39641417[16] (also designated WDS J06230+2231BC), itself a binary pair.[17]

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