Mu Centauri
Mu Centauri, Latinized from μ Centauri, is a third-magnitude star in the southern constellation of Centaurus. With the stars ν and φ Centauri, it marks what has been traditionally portrayed as "dextro Latere" (the right side) of the Centaur. The apparent visual magnitude of this star is 3.42, making it one of the brighter members of the constellation. The distance to this star can be estimated directly using parallax measurements, which yield a value of roughly 510 light years (155 parsecs) from Earth.

The spectrum of Mu Centauri matches a stellar classification of B2 IV-Ve. The 'e' suffix is used to mark the presence of emission lines, which indicates this is a Be star surrounded by a circumstellar disk of hot gas that was formed from material ejected from the star. Mu Centauri is a pulsating variable star that has multiple non-radial cycles with a primary period of 0.503 days. Three other pulsation cycles have a similar period, while two have a shorter interval of about 0.28 days. It undergoes outburst events that result in the transfer of additional material to the surrounding disk. During these outbursts, the star can experience transient periodicities. Mu Centauri is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +2.75 to +3.25.

This star is spinning rapidly, with a projected rotational velocity of 194, km s−1 and is completing a full rotation in about 11.615 hours. The equatorial azimuthal velocity is around 85% of the critical velocity where the star would start to break up, resulting a pronounced equatorial bulge that is about 26% wider than the radius at the poles. Because of the oblate spheroidal shape of this star, the polar region is at a higher temperature than the equator—23,000 K versus 17,600 K respectively. Likewise, the gravitational force at the poles is greater than along the equator. The axis of rotation of the star is tilted by an angle of about (19 ± 3)° to the line of sight from the Earth.

At an estimated age of nearly 20 million years, this star is around 55–65% of the way through its evolutionary period on the main sequence of core hydrogen burning stars. It has around nine times the mass of the Sun and four times the Sun's radius, but emits over 2,000 times as much energy as the Sun. The outer atmosphere has a mean effective temperature of 22,410 K, giving the star a blue-white hue.

This star is a proper motion member of the Upper-Centaurus Lupus sub-group in the
Scorpius-Centaurus OB association,
the nearest such co-moving association of massive stars to the Sun.
Q1806983
Latinized
UNK
Q523
star
Concept
Q8928
constellation
Concept
Q8844
Centaurus
CEL
Q2358189
ν
CEL
Q2703519
φ Centauri
CEL
Q124313
apparent visual magnitude
Concept
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brighter members
UNK
Q165074
parallax
Concept
Q531
light year
Concept
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parsec
Concept
Q2
Earth
CEL
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spectrum
Concept
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stellar classification
Concept
Q212111
emission line
Concept
Q812800
Be star
Concept
Q60788292
Gamma Cassiopeiae type
Concept
Q6243
variable star
Concept
Q6464
projected rotational velocity
Concept
Q124274
azimuth
Concept
Q1440352
equatorial bulge
UNK
Q208395
oblate spheroid
Concept
Q3450
main sequence
Concept
Q1057093
hydrogen burning
Concept
Q854050
effective temperature
Concept
Q193223
proper motion
Concept
Q45059
Scorpius-Centaurus
CEL
Q736194
OB association
Concept
Q2357648
Mu Centauri
CEL
Q2357648
Mu Centauri
CEL
Q2357648
Mu Centauri
CEL
Q2357648
Mu Centauri
CEL
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instance of
constellation
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