Mu Geminorum
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 22m 57.62686s |
| Declination | +22° 30′ 48.8979″ |
| Apparent magnitude (V) | 2.75 - 3.02 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | M3 III |
| U−B color index | +1.924 |
| B−V color index | +1.643 |
| Variable type | LB |
| Astrometry | |
| Radial velocity (Rv) | +54.38±0.24 km/s |
| Proper motion (μ) | RA: +56.39 mas/yr Dec.: −110.03 mas/yr |
| Parallax (π) | 14.08±0.71 mas |
| Distance | 230 ± 10 ly (71 ± 4 pc) |
| Absolute magnitude (MV) | −1.42 |
| Details | |
| Mass | 1.9±0.5 M☉ |
| Radius | 107.7 R☉ |
| Luminosity | 1,692 L☉ |
| Surface gravity (log g) | 0.82±0.09 cgs |
| Temperature | 3,643 K |
| Metallicity [Fe/H] | −0.03±0.03 dex |
| Rotational velocity (v sin i) | 8.4 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 | |
| Database references | |
| SIMBAD | data |
Mu Geminorum or μ Geminorum, formally named Tejat (/ˈtiːdʒət/), 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. The position of the star near the ecliptic means that it is subject to lunar occultations.
Mu Geminorum forms the primary or 'A' component of a double star system designated WDS J06230+2231 along with UCAC2 39641417 (also designated WDS J06230+2231BC), itself a binary pair.