Omicron2 Centauri
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Template:Location mark Location of ο2 Cen (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +5.14[2] (5.12 - 5.22[3]) |
| Characteristics | |
| Evolutionary stage | Blue supergiant |
| Spectral type | A2Iae[3] |
| U−B Template:Engvar | −0.11[2] |
| B−V Template:Engvar | +0.49[2] |
| Variable type | α Cyg[3] |
| Astrometry | |
| Radial velocity (Rv) | −16.8[4] km/s |
| Proper motion (μ) | RA: −6.976[1] mas/yr Dec.: +1.118[1] mas/yr |
| Parallax (π) | 0.4665±0.0713 mas[1] |
| Distance | approx. Template:Rnd ly (approx. Template:Rnd pc) |
| Absolute magnitude (MV) | −7.50[5] |
| Details[5] | |
| Mass | 18 Template:Solar mass |
| Radius | 131 Template:Solar radius |
| Luminosity | 105,000 Template:Solar luminosity |
| Surface gravity (log g) | 1.46 cgs |
| Temperature | 9,080 K |
| Rotation | 132 days |
| Rotational velocity (v sin i) | 50 km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| HR 4442, HD 100262, CD−58°4101, FK5 2920, HIP 56250, SAO 239146, GC 15820 | |
| Database references | |
| SIMBAD | data |
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Omicron2 Centauri (ο2 Cen, ο2 Centauri) is a star in the constellation Centaurus.
ο2 Centauri is a white A-type blue supergiant with a mean apparent magnitude of +5.12. It is approximately 7,000 light years from Earth. It is classified as an Alpha Cygni type variable star and its brightness varies from magnitude +5.12 to +5.22 with a period of 46.3 days.
In 1996, Kaufer and colleagues calculated Omicron2 Centauri to be around 136,000 times as luminous, 18 times as massive and have 131 times the diameter of the Sun.[5]
ο2 Cen forms a close naked eye pair with ο1 Cen, another 5th magnitude supergiant (possibly a yellow hypergiant). Both stars are located between Crux (the Southern Cross) and the brightest yellow hypergiant in the sky, V382 Carinae.
References
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