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Eta Centauri
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension 14h35m30.4s
Declination −42°09′28″
Apparent magnitude (V) +2.33
Spectral type B1.5Vne
U-B color index −0.83
B-V color index −0.19
Variable type Gamma Cas
Radial velocity (Rv) 0 km/s
Proper motion (μ) RA: −35.31 mas/yr
Dec.: −32.44 mas/yr
Parallax (π) 10.57 ± 0.83 mas
Distance 310 ± 20 ly
(95 ± 7 pc)
Absolute magnitude (MV) −2.54
Mass 8.5-10.5 M
Radius 5-6 R
Luminosity 6,000 L
Temperature 20,000 K
Metallicity ?
Rotation 333 km/s.
Age < 2 × 107 years
Other designations
HR 5440, CD−41°8917, CP−41°6839, HD 127972, SAO 225044, FK5 537, HIP 71352, GC 19656
Database references

Eta Centauri (η Cen / η Centauri) is a star in the constellation Centaurus.

This is a rapidly rotating star that completes a full rotation in less than a day. It is also a Be star, which means it has variable emissions in its hydrogen spectral lines. Finally it is also slightly variable, and classified as a Gamma Cassiopeiae variable, with multiple periods of variability. It is approximately 309 light years from Earth. Eta Centauri is sufficiently large that it is on the dividing line between stars that evolve into white dwarfs and those that turn into a supernovae.


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