Delta Centauri

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δ Centauri
Observation data
Epoch J2000
Constellation
(pronunciation)
Centaurus
Right ascension 12h08m21.5s
Declination −50°43′21″
Apparent magnitude (V) +2.58
Characteristics
Spectral type B2IVne
U-B color index −0.90
B-V color index −0.12
Variable type γ Cas
Astrometry
Radial velocity (Rv) +11 km/s
Proper motion (μ) RA: −47.53 mas/yr
Dec.: −6.42 mas/yr
Parallax (π) 8.25 ± 0.79 mas
Distance 395 ly (121 pc)
Absolute magnitude (MV) −2.82
Other designations
Ma Wei, HR 4621, CD−50°6697, CP−50°4862, HD 105435, SAO 239689, FK5 452, HIP 59196, GC 16584, CCDM J12083-5043

Delta Centauri (δ Cen / δ Centauri) is a star in the constellation Centaurus. It is sometimes called by the traditional Chinese name 马尾 Ma Wei, meaning the Horse's Tail.

It has apparent magnitude +2.60 and is of spectral type B2IVne. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +2.51 to +2.65.

This Be star shares a proper motion with the nearby stars HD 105382 and HD 105383, so they may form a small cluster or perhaps a triple star system.