Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Centaurus |
Right ascension | 14h 06m 40.94752s[1] |
Declination | –36° 22′ 11.8371″[1] |
Apparent magnitude (V) | +2.06[2] |
Characteristics | |
Evolutionary stage | Horizontal branch[3] |
Spectral type | K0 III[4] |
U−B color index | +0.90[2] |
B−V color index | +0.99[2] |
Astrometry | |
Radial velocity (Rv) | +1.3[5] km/s |
Proper motion (μ) | RA: –520.53[1] mas/yr Dec.: –518.06[1] mas/yr |
Parallax (π) | 55.45 ± 0.20 mas[1] |
Distance | 58.8 ± 0.2 ly (18.03 ± 0.07 pc) |
Absolute magnitude (MV) | 0.87[6] |
Details | |
Mass | 1.27[7] M☉ |
Radius | 10.6[8] R☉ |
Luminosity | 60[3] L☉ |
Surface gravity (log g) | 2.75[9] cgs |
Temperature | 4,980[9] K |
Metallicity [Fe/H] | 0.03[9] dex |
Other designations | |
Menkent, θ Cen, Theta Cen, 5 Centauri, CD−35° 9260, FK5 520, HD 123139, HIP 68933, HR 5288, SAO 205188, LHS 2858[10] | |
Database references | |
SIMBAD | data |
Theta Centauri or θ Centauri, officially named Menkent (/ˈmɛŋkɛnt/),[11][12] is a single[7] star in the southern constellation of Centaurus, the centaur. With an apparent visual magnitude of +2.06,[2] it is the fourth-brightest member of the constellation. Based on parallax measurements obtained during the Hipparcos mission, it is about 58.8 light-years (18.0 parsecs) distant from the Sun.[1] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.73 arcsecond/yr.[13] This suggests that Menkent may have originated in the outer disk of the Milky Way and is merely passing through the solar neighborhood.[3]
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