Rho Centauri
Rho Centauri, Latinized from ρ Centauri, is a binary star 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. 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. 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.

The primary component of this system is a B-type main-sequence star with a stellar classification of B3 V. It is about 24 million years old with a high rate of spin, showing a projected rotational velocity of 147 km/s. It has 6.6 times the mass of the Sun and 3.8 times the Sun's radius. The star is radiating 810 times the luminosity of the Sun from its photosphere at an effective temperature of 19,500 K.

The secondary companion is 1.1 magnitudes fainter than the primary, with a projected separation of along a position angle of 19.72°, as of 2013.
Q466126
Latinized
ORG
Q50053
binary star
Concept
Q8928
constellation
Concept
Q8844
Centaurus
CEL
Q124313
apparent visual magnitude
Concept
Q531
light year
Concept
Q906561
parallax
Concept
Q240105
radial velocity
Concept
Q193223
proper motion
Concept
Q45059
Scorpius-Centaurus
CEL
Q736194
OB association
Concept
Q767432
B-type main-sequence star
Concept
Q25377588
stellar classification
Concept
Q6464
projected rotational velocity
Concept
Q180892
mass of the Sun
Concept
Q48440
Sun's radius
Concept
Q843877
luminosity of the Sun
Concept
Q6372
photosphere
Concept
Q854050
effective temperature
Concept
Q5571730
projected separation
UNK
Q2105737
position angle
UNK
Q2701215
Rho Centauri
CEL
2013-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2013
DATE
++3.97^^http://www.w3.org/2001/XMLSchema#decimal
+3.97
NUMBER
++15^^http://www.w3.org/2001/XMLSchema#decimal
+15
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+24^^http://www.w3.org/2001/XMLSchema#decimal
24
NUMBER
+6.6^^http://www.w3.org/2001/XMLSchema#decimal
6.6
NUMBER
+3.8^^http://www.w3.org/2001/XMLSchema#decimal
3.8
NUMBER
+1.1^^http://www.w3.org/2001/XMLSchema#decimal
1.1
NUMBER
+19.72^^http://www.w3.org/2001/XMLSchema#decimal
19.72
NUMBER
constellation
radius
instance of