Pi4 Orionis
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion |
| Right ascension | 04h 51m 12.4s |
| Declination | 05° 36′ 18.4″ |
| Apparent magnitude (V) | 3.67 |
| Characteristics | |
| Spectral type | B2 III |
| U−B color index | −0.81 |
| B−V color index | −0.16 |
| Astrometry | |
| Radial velocity (Rv) | 23.3 km/s |
| Proper motion (μ) | RA: −3.62 mas/yr Dec.: 1.03 mas/yr |
| Parallax (π) | 2.59 ± 0.80 mas |
| Distance | approx. 1,300 ly (approx. 400 pc) |
| Details | |
| Radius | 9.1[1] R☉ |
| Surface gravity (log g) | 3.5[1] cgs |
| Temperature | 21,874 ± 126[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Pi4 Orionis (π4 Ori, π4 Orionis) is a spectroscopic binary star in the constellation Orion. It is about 1,300 light years away and is one of the most luminous stars known. It is one of a series of stars that share the Bayer designation Pi Orionis.
References
- 1 2 3 Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601
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