Phi2 Orionis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 36m 54.389s |
| Declination | +09° 17′ 26.42″ |
| Apparent magnitude (V) | 4.081 |
| Characteristics | |
| Evolutionary stage | Yellow giant |
| Spectral type | G8 III-IV |
| U−B color index | +0.618 |
| B−V color index | +0.966 |
| Astrometry | |
| Radial velocity (Rv) | 99.03±0.18 km/s |
| Proper motion (μ) | RA: +98.301 mas/yr Dec.: −305.022 mas/yr |
| Parallax (π) | 28.6722±0.1859 mas |
| Distance | 113.8 ± 0.7 ly (34.9 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.33±0.07 |
| Details | |
| Mass | 1.07±0.04 M☉ |
| Radius | 8.22±0.07 R☉ |
| Luminosity | 29.8±0.4 L☉ |
| Surface gravity (log g) | 3.00±0.02 cgs |
| Temperature | 4,703±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 | |
| φ2 Ori, 40 Orionis, BD+09°898, HD 37160, HIP 26366, HR 1907, SAO 112958 | |
| Database references | |
| SIMBAD | data |
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 28.67 mas, it is located around 114 light-years from the Sun.
This is an evolved G-type star of stellar classification G8 III-IV, which means that it is in an evolutionary stage between a subgiant (IV) and a giant star (III). It is estimated to be 6.9 billion years old, has 1.07 times the mass of the Sun, but has expanded to 8 times the Sun's radius. The star shines with 30 times the solar luminosity from its outer atmosphere at an effective temperature of 4,700 K.