Pi Centauri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 11h 21m 00.41s[1] |
| Declination | −54° 29′ 27.7″[1] |
| Apparent magnitude (V) | +3.90 |
| Characteristics | |
| Spectral type | B5Vn |
| U−B color index | −0.59 |
| B−V color index | −0.15 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | +9 km/s |
| Proper motion (μ) | RA: -35.85 ± 0.34[1] mas/yr Dec.: -1.72 ± 0.27[1] mas/yr |
| Parallax (π) | 9.12 ± 0.34[1] mas |
| Distance | 360 ± 10 ly (110 ± 4 pc) |
| Absolute magnitude (MV) | −1.06 |
| Orbit[2] | |
| Primary | π Centauri A |
| Companion | π Centauri B |
| Period (P) | 39.0 ± 0.19 yr |
| Semi-major axis (a) | 0.2263 ± 0.0011″ |
| Eccentricity (e) | 0.8530 ± 0.0040 |
| Inclination (i) | 19.4 ± 4.9° |
| Longitude of the node (Ω) | 327.8 ± 3.9° |
| Periastron epoch (T) | 2010.410 ± 0.037 |
| Argument of periastron (ω) (secondary) | 340.3 ± 4.0° |
| Other designations | |
| Database references | |
| SIMBAD | data |
Pi Centauri (π Cen, π Centauri) is a binary star in the constellation Centaurus. It is approximately 360 light years from Earth.
Both components are blue-white B-type main sequence dwarfs. The primary π Centauri A, has an apparent magnitude of +4.3, while the apparent magnitude of its companion, π Centauri B, is +5.0. The two stars orbit around their common centre of mass once every 39 years.[2] The semi-major axis of the companion is 0.23 arcseconds on the sky.
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357.Vizier catalog entry - 1 2 Tokovinin, Andrei (2012). "Speckle Interferometry and Orbits of "Fast" Visual Binaries". The Astronomical Journal. 144 (2). 56. Bibcode:2012AJ....144...56T. arXiv:1206.1882 . doi:10.1088/0004-6256/144/2/56.
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