4 Centauri
4 Centauri is a star in the constellation Centaurus. It is a blue-white B-type subgiant with an apparent magnitude of +4.75 and is approximately 640 light years from Earth.

4 Centauri is a hierarchical quadruple star system. The primary component of the system, 4 Centauri A, is a spectroscopic binary, meaning that its components cannot be resolved but periodic Doppler shifts in its spectrum show that it must be orbiting. 4 Centauri A has an orbital period of 6.927 days and an eccentricity of 0.23. Because light from only one of the stars can be detected (i.e. it is a single-lined spectroscopic binary), some parameters such as its inclination are unknown. The secondary component, is also a single-lined spectroscopic binary. It has an orbital period of 4.839 days and an eccentricity of 0.05. The secondary component is a metallic-lined A-type star. The two pairs themselves are separated by 14 arcseconds; one orbit would take at least 55,000 years.
Q523
star
Concept
Q8928
constellation
Concept
Q8844
Centaurus
CEL
Q25377588
B-type
Concept
Q6227
subgiant
Concept
Q124313
apparent magnitude
Concept
Q531
light year
Concept
Q2
Earth
CEL
Q595871
star system
Concept
Q50053
spectroscopic binary
Concept
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resolved
Concept
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Doppler shift
Concept
Q752171
spectrum
Concept
Q37640
orbital period
Concept
Q208474
eccentricity
Concept
Q25377588
A-type star
Concept
Q4639034
4 Centauri
CEL
Q4639034
4 Centauri
CEL
Q4639034
4 Centauri
CEL
Q4639034
4 Centauri
CEL
+4^^http://www.w3.org/2001/XMLSchema#decimal
4
NUMBER
++4.75^^http://www.w3.org/2001/XMLSchema#decimal
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NUMBER
+4^^http://www.w3.org/2001/XMLSchema#decimal
4
NUMBER
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NUMBER
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NUMBER
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6.927
NUMBER
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NUMBER
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NUMBER
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14
NUMBER
constellation
instance of
instance of