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Star in the constellation Centaurus From Wikipedia, the free encyclopedia
Sigma Centauri, Latinized from σ Centauri, is the Bayer designation for a solitary[9] star in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of 3.91.[2] A visual companion at an angular separation of 88.11±0.37 mas along a position angle of 14.33°±2.59° was detected in 2010 using interferometry,[10] but its association with Sigma Centauri remains undetermined as of 2013.[11] The distance to Sigma Centauri, based upon an annual parallax shift of 7.92 mas,[1] is around 412 light years.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Centaurus |
Right ascension | 12h 28m 02.38208s[1] |
Declination | −50° 13′ 50.2872″[1] |
Apparent magnitude (V) | 3.91[2] |
Characteristics | |
Spectral type | B3 V[3] |
U−B color index | −0.805[2] |
B−V color index | −0.202[2] |
Astrometry | |
Radial velocity (Rv) | +12.8±1.4[4] km/s |
Proper motion (μ) | RA: −32.36[1] mas/yr Dec.: −12.51[1] mas/yr |
Parallax (π) | 7.92 ± 0.18 mas[1] |
Distance | 412 ± 9 ly (126 ± 3 pc) |
Absolute magnitude (MV) | −1.60[5] |
Details | |
Mass | 6.8±0.1[3] M☉ |
Radius | 4.5[6] R☉ |
Luminosity | 1,101[7] L☉ |
Temperature | 15,744[7] K |
Rotational velocity (v sin i) | 169[4] km/s |
Age | 25.3±6.3[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is a B-type main sequence star with a stellar classification of B3 V.[3] It is a helium-rich star, the most massive type of chemically peculiar star.[12] Sigma Centauri has around 6.8 times the mass of the Sun and 4.5[6] times the Sun's radius. It has a relatively high rate of spin with a projected rotational velocity of 169[4] km/s, and is around 25 million years old.[3] The star radiates 1,101 times the solar luminosity from its outer atmosphere at an effective temperature of 15,744[7] K. It is a member of the Lower Centaurus Crux component of the Scorpius–Centaurus association.[4]
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