Xi2 Centauri
Xi2 Centauri, Latinized from ξ2 Centauri, is a triple star system in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of 4.30, and forms a wide optical double with the slightly dimmer ξ1 Centauri. Based upon an annual parallax shift of 6.98 mas, Xi2 Centauri lies roughly 470 light years from the Sun. At that distance, the visual magnitude is diminished by an interstellar extinction factor of 0.32 due to intervening dust.

This system was discovered to be a single-lined spectroscopic binary in 1910 by American astronomer Joseph Haines Moore. The pair, component A, orbit each other with a period of 7.6497 days and an eccentricity of 0.35. The primary is a B-type star with a stellar classification of B1.5 V or B2 IV, depending on the source. This indicates it may be a main sequence star or a more evolved subgiant star. It has about 8.1 times the mass of the Sun and radiates 1,702 times the solar luminosity from its outer atmosphere at an effective temperature of 20,790 K.

A third star, component B, is a magnitude 9.38 F-type main sequence star with a classification of F7 V. It has 1.25 times the mass of the Sun and radiates 2.4 times the solar luminosity at an effective temperature of 6,194 K. It lies at an angular separation of 25.1 arc seconds from the inner pair. They share a common proper motion, indicating they may be gravitationally bound with an orbital period of around 41,000 years.

The system has a peculiar velocity of . It belongs to the Scorpius–Centaurus Association and appears to be a member of the Gould's Belt.
Q1806983
Latinized
UNK
Q595871
triple star
Concept
Q8928
constellation
Concept
Q8844
Centaurus
CEL
Q124313
apparent visual magnitude
Concept
Q13890
optical double
Concept
Q5097799
ξ1 Centauri
CEL
Q906561
parallax shift
Concept
Q12097402
mas
Concept
Q531
light year
Concept
Q525
Sun
CEL
Q943247
extinction factor
Concept
Q50053
spectroscopic binary
Concept
Q6283734
Joseph Haines Moore
PER
Q37640
period
Concept
Q208474
eccentricity
Concept
Q25377588
B-type star
Concept
Q25377588
stellar classification
Concept
Q3450
main sequence star
Concept
Q6472
evolved
Concept
Q6227
subgiant star
Concept
Q180892
mass of the Sun
Concept
Q843877
solar luminosity
Concept
Q6311
outer atmosphere
Concept
Q854050
effective temperature
Concept
Q1353952
F-type main sequence star
Concept
Q1357788
angular separation
Concept
Q12097402
arc second
Concept
Q5571730
common proper motion
UNK
Q1253791
peculiar velocity
Concept
Q45059
Scorpius–Centaurus Association
CEL
Q24469
Gould's Belt
DIS
Q3304598
Xi2 Centauri
CEL
Q3304598
Xi2 Centauri
CEL
1910-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1910
DATE
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NUMBER
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NUMBER
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NUMBER
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NUMBER
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NUMBER
constellation
instance of
instance of