Pi Centauri
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Centaurus |
| Right ascension | 11h21m00.4s |
| Declination | −54°29′28″ |
| 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: −35.32 mas/yr Dec.: −2.20 mas/yr |
| Parallax (π) | 10.15 ± 0.53 mas |
| Distance | 321 ly (98.5 pc) |
| Absolute magnitude (MV) | −1.06 |
| Visual binary orbit | |
| Companion | π Centauri B |
| Period (P) | 39.18 yr |
| Semimajor axis (a) | 0.23" |
| Eccentricity (e) | 0.84 |
| Inclination (i) | 38° |
| Longitude of the node (Ω) | 113° |
| Periastron epoch (T) | 1973 |
| Other designations | |
| Database references | |
| SIMBAD | data |
Pi Centauri (π Cen / π Centauri) is a binary star in the constellation Centaurus. It is approximately 321 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 39.18 years. The semi-major axis of the companion is 0.23 arcseconds on the sky.
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