Phi2 Orionis
Phi2 Orionis is a star in the constellation Orion, where it forms a small triangle on the celestial sphere with the nearby Meissa and Phi1 Orionis. This star is visible to the naked eye with an apparent visual magnitude of 4.081. Based upon an annual parallax shift of 27.76 mas, it is located around 117 light-years from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 36m 54.38819s |
| Declination | +09° 17′ 26.4096″ |
| Apparent magnitude (V) | 4.081 |
| Characteristics | |
| Spectral type | G8 III-IV |
| U−B color index | +0.618 |
| B−V color index | +0.966 |
| Astrometry | |
| Radial velocity (Rv) | +98.96±0.09 km/s |
| Proper motion (μ) | RA: +97.24 mas/yr Dec.: −305.57 mas/yr |
| Parallax (π) | 27.76 ± 0.27 mas |
| Distance | 117 ± 1 ly (36.0 ± 0.4 pc) |
| Absolute magnitude (MV) | +1.33±0.07 |
| Details | |
| Mass | 1.07±0.04 M☉ |
| Radius | 7.72±0.27 R☉ |
| Luminosity | 31.6 L☉ |
| Surface gravity (log g) | 3.00±0.02 cgs |
| Temperature | 4,856±11 K |
| Metallicity [Fe/H] | −0.56±0.02 dex |
| Rotational velocity (v sin i) | 1.91±0.53 km/s |
| Age | 6.91±1.04 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a G-type giant or subgiant star with a stellar classification of G8 III-IV that, at the age of 6.9 billion years, is evolving away from the main sequence. It has 1.07 times the mass of the Sun, but has expanded to 7.72 times the Sun's radius. The star shines with 31.6 times the solar luminosity from its outer atmosphere at an effective temperature of 4,856 K.
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