  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 04h 56m 22.27612s[1] |
| Declination | +13° 30′ 52.0932″[1] |
| Apparent magnitude (V) | 4.06[2] |
| Characteristics | |
| Spectral type | K2 IIIb[3] |
| U−Bcolor index | +1.14[2] |
| B−Vcolor index | +1.17[2] |
| Astrometry | |
| Radial velocity (Rv) | 2.54±0.15[4] km/s |
| Proper motion (μ) | RA: −74.88[1]mas/yr Dec.: −44.33[1]mas/yr |
| Parallax (π) | 17.54±0.21 mas[1] |
| Distance | 186 ± 2 ly (57.0 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.501[5] |
| Details[4] | |
| Radius | 15 R☉ |
| Luminosity | 79 L☉ |
| Surface gravity (log g) | 2.4 cgs |
| Temperature | 4,498 K |
| Metallicity[Fe/H] | −0.26 dex |
| Rotational velocity (v sin i) | 0.0 km/s |
| Age | 5.42±2.38[5] Gyr |
| Other designations | |
| ο2 Ori,9 Orionis,BD+13°740,HD 31421,HIP 22957,HR 1580,SAO 94218[6] | |
| Database references | |
| SIMBAD | data |
Omicron2 Orionis (ο2 Ori) is a solitary[7]star in theconstellationOrion. It has anapparent visual magnitude of 4.06,[2] which is bright enough to be seen with the naked eye. Based upon an annualparallax shift of 17.54 mas, it is around 186 light years from theSun. At that distance, the visual magnitude of the star is diminished by an interstellarabsorption factor of 0.09 due to intervening dust.[8]
This is ared clump[5]giant star with astellar classification of K2 IIIb.[3] It is around 5.4[5] billion years old with aprojected rotational velocity that is too small to be measured. The star has expanded to about 15 times theradius of the Sun and shines with 79 times thesolar luminosity from itsouter atmosphere at aneffective temperature of 4,498 K.[4] Omicron2 Orionis is most likely a member of theMilky Way'sthin disk population.[5]
{{cite web}}: CS1 maint: postscript (link)