Sigma Centauri
Sigma Centauri, Latinized from σ Centauri, is the Bayer designation for a solitary star in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of 3.91. A visual companion at an angular separation of along a position angle of was detected in 2010 using interferometry, but its association with Sigma Centauri remains undetermined as of 2013. The distance to Sigma Centauri, based upon an annual parallax shift of 7.92 mas, is around 412 light years.

This is a B-type main sequence star with a stellar classification of B3 V. It is a helium-rich star, the most massive type of chemically peculiar star. Sigma Centauri has around 6.8 times the mass of the Sun and 4.5 times the Sun's radius. It has a relatively high rate of spin with a projected rotational velocity of 169 km/s, and is around 25 million years old. The star radiates 1,101 times the solar luminosity from its outer atmosphere at an effective temperature of 15,744 K. It is a member of the Lower Centaurus Crux component of the Scorpius–Centaurus Association.
Q1806983
Latinized
UNK
Q105616
Bayer designation
Concept
Q523
star
Concept
Q8928
constellation
Concept
Q8844
Centaurus
CEL
Q124313
apparent visual magnitude
Concept
Q1357788
angular separation
Concept
Q2105737
position angle
UNK
Q850283
interferometry
Concept
Q906561
parallax shift
Concept
Q531
light year
Concept
Q767432
B-type main sequence star
Concept
Q25377588
stellar classification
Concept
Q1142192
chemically peculiar star
Concept
Q180892
mass of the Sun
Concept
Q48440
Sun's radius
Concept
Q6464
projected rotational velocity
Concept
Q843877
solar luminosity
Concept
Q6311
outer atmosphere
Concept
Q854050
effective temperature
Concept
Q45059
Scorpius–Centaurus Association
CEL
Q578198
Sigma Centauri
CEL
Q578198
Sigma Centauri
CEL
Q578198
Sigma Centauri
CEL
Q578198
Sigma Centauri
CEL
2010-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2010
DATE
2013-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2013
DATE
+3.91^^http://www.w3.org/2001/XMLSchema#decimal
3.91
NUMBER
+7.92^^http://www.w3.org/2001/XMLSchema#decimal
7.92
NUMBER
+3^^http://www.w3.org/2001/XMLSchema#decimal
3
NUMBER
+6.8^^http://www.w3.org/2001/XMLSchema#decimal
6.8
NUMBER
+4.5^^http://www.w3.org/2001/XMLSchema#decimal
4.5
NUMBER
+25^^http://www.w3.org/2001/XMLSchema#decimal
25
NUMBER
instance of
constellation
apparent magnitude
radius
instance of