Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Centaurus |
Right ascension | 12h 11m 39.12805s [1] |
Declination | −52° 22′ 06.4067″ [1] |
Apparent magnitude (V) | +3.97 [2] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | B3 V [3] |
U−B color index | −0.650 [4] |
B−V color index | −0.156±0.008 [2] |
Astrometry | |
Radial velocity (Rv) | +15.0±4.1 [5] km/s |
Proper motion (μ) |
RA: −43.741
[1]
mas/
yr Dec.: −11.771 [1] mas/ yr |
Parallax (π) | 11.8348 ± 0.3746 mas [1] |
Distance | 276 ± 9
ly (84 ± 3 pc) |
Absolute magnitude (MV) | −1.33 [2] |
Details | |
Mass | 6.6±0.1 [6] M☉ |
Radius | 3.8 [7] R☉ |
Luminosity | 810.42 [2] L☉ |
Surface gravity (log g) | 3.95 [8] cgs |
Temperature | 19,500 [8] K |
Rotational velocity (v sin i) | 147 [9] km/s |
Age | 23.7±1.4 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Rho Centauri, Latinized from ρ Centauri, is a binary star [11] system in the southern constellation of Centaurus. It is visible to the naked eye as a blue-white hued point of light with a combined apparent visual magnitude of +3.97. [2] The system is located approximately 276 light years from the Sun based on parallax, and is drifting further away with a radial velocity of around +15 km/s. [5] It is a proper motion member of the Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun. [3]
The primary component of this system is a B-type main-sequence star with a stellar classification of B3 V. [3] It is about 24 [6] million years old with a high rate of spin, showing a projected rotational velocity of 147 km/s. [9] It has 6.6 [6] times the mass of the Sun and 3.8 [7] times the Sun's radius. The star is radiating 810 [2] times the luminosity of the Sun from its photosphere at an effective temperature of 19,500 K. [8]
The secondary companion is 1.1 magnitudes fainter than the primary, with a projected separation of 5.68 AU along a position angle of 19.72°, as of 2013. [11]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Centaurus |
Right ascension | 12h 11m 39.12805s [1] |
Declination | −52° 22′ 06.4067″ [1] |
Apparent magnitude (V) | +3.97 [2] |
Characteristics | |
Evolutionary stage | main sequence |
Spectral type | B3 V [3] |
U−B color index | −0.650 [4] |
B−V color index | −0.156±0.008 [2] |
Astrometry | |
Radial velocity (Rv) | +15.0±4.1 [5] km/s |
Proper motion (μ) |
RA: −43.741
[1]
mas/
yr Dec.: −11.771 [1] mas/ yr |
Parallax (π) | 11.8348 ± 0.3746 mas [1] |
Distance | 276 ± 9
ly (84 ± 3 pc) |
Absolute magnitude (MV) | −1.33 [2] |
Details | |
Mass | 6.6±0.1 [6] M☉ |
Radius | 3.8 [7] R☉ |
Luminosity | 810.42 [2] L☉ |
Surface gravity (log g) | 3.95 [8] cgs |
Temperature | 19,500 [8] K |
Rotational velocity (v sin i) | 147 [9] km/s |
Age | 23.7±1.4 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Rho Centauri, Latinized from ρ Centauri, is a binary star [11] system in the southern constellation of Centaurus. It is visible to the naked eye as a blue-white hued point of light with a combined apparent visual magnitude of +3.97. [2] The system is located approximately 276 light years from the Sun based on parallax, and is drifting further away with a radial velocity of around +15 km/s. [5] It is a proper motion member of the Lower Centaurus–Crux sub-group in the Scorpius–Centaurus OB association, the nearest such association of co-moving massive stars to the Sun. [3]
The primary component of this system is a B-type main-sequence star with a stellar classification of B3 V. [3] It is about 24 [6] million years old with a high rate of spin, showing a projected rotational velocity of 147 km/s. [9] It has 6.6 [6] times the mass of the Sun and 3.8 [7] times the Sun's radius. The star is radiating 810 [2] times the luminosity of the Sun from its photosphere at an effective temperature of 19,500 K. [8]
The secondary companion is 1.1 magnitudes fainter than the primary, with a projected separation of 5.68 AU along a position angle of 19.72°, as of 2013. [11]