Global InformationPhi1 Orionis information
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 34m 49.23804s[1] |
| Declination | +09° 29′ 22.4878″[1] |
| Apparent magnitude (V) | 4.42[2] |
| Characteristics | |
| Spectral type | B0 III[3] |
| U−B color index | −0.97[2] |
| B−V color index | −0.15[2] |
| Astrometry | |
| Radial velocity (Rv) | +33.2[4] km/s |
| Proper motion (μ) | RA: +0.27[1] mas/yr Dec.: −2.26[1] mas/yr |
| Parallax (π) | 3.00 ± 0.25 mas[1] |
| Distance | 1,090 ± 90 ly (330 ± 30 pc) |
| Absolute magnitude (MV) | −3.53±0.30 |
| Orbit[5] | |
| Period (P) | 3,068.03 d |
| Eccentricity (e) | 0.22 |
| Periastron epoch (T) | 2418051.8 JD |
| Argument of periastron (ω) (secondary) | 105° |
| Semi-amplitude (K1) (primary) | 13.3 km/s |
| Details[6] | |
| Mass | 15.5±1.1 M☉ |
| Radius | 6.3±1.0 R☉ |
| Luminosity | 28,840 L☉ |
| Surface gravity (log g) | 4.05±0.10 cgs |
| Temperature | 30,000±300 K |
| Rotational velocity (v sin i) | 20[7] km/s |
| Age | 7.2±0.8[8] Myr |
| Other designations | |
φ1 Ori, 37 Orionis, BD+09° 877, FK5 208, HD 36822, HIP 26176, HR 1876, SAO 112914.[9] | |
| Database references | |
| SIMBAD | data |
Phi1 Orionis is a binary star system in the constellation Orion, positioned less than a degree to the south of Meissa.[10] It is visible to the naked eye with an apparent visual magnitude of 4.42.[2] The distance to this system, based upon an annual parallax shift of 3.0 mas,[1] is around 1,090 light-years.
This is a single-lined[6] spectroscopic binary star system with an orbital period of 3,068 days and an eccentricity of 0.22.[5] It is a member of the young Lambda Orionis cluster[11] and is roughly 7 million years old.[8] The primary component is a B-type giant star with a stellar classification of B0 III.[3] It has over 15 times the mass of the Sun and around 6.3 times the Sun's radius.[6] Nothing is known about the secondary companion. It does not contribute a significant amount of light to the combined spectrum.[6]
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