| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Orion |
| Right ascension | 06h11m 56.39693s[1] |
| Declination | +14° 12′ 31.5555″[1] |
| Apparent magnitude (V) | 4.47[2] |
| Characteristics | |
| Spectral type | B3 IV[3] |
| U−B color index | −0.65[2] |
| B−V color index | −0.19[2] |
| Astrometry | |
| Radial velocity (Rv) | +19.30[4] km/s |
| Proper motion (μ) | RA: +0.29[1] mas/yr Dec.: −20.12[1] mas/yr |
| Parallax (π) | 5.37 ± 0.23 mas[1] |
| Distance | 610 ± 30 ly (186 ± 8 pc) |
| Orbit[5] | |
| Period (P) | 45.1 d |
| Eccentricity (e) | 0.26 |
| Periastron epoch (T) | 2,441,962.3 JD |
| Argument of periastron (ω) (secondary) | 205° |
| Semi-amplitude (K1) (primary) | 22.4 km/s |
| Details | |
| ξ Ori A | |
| Mass | 6.7±0.1[3] M☉ |
| Luminosity | 1,390[6] L☉ |
| Temperature | 15,476[6] K |
| Rotational velocity (v sin i) | 160[7] km/s |
| Age | 32.1±4.3[3] Myr |
| Other designations | |
ξ Ori, 70 Orionis, BD+14° 1187, HD 42560, HIP 29426, HR 2199, SAO 95362[8] | |
| Database references | |
| SIMBAD | data |
Xi Orionis (ξ Orionis) is a binary star system in the northeastern part of the constellationofOrion, well above the red giant star Betelgeuse in the sky. It lies next to another blue main-sequence star, Nu Orionis, which is somewhat closer at 520 light-years' distance. The apparent visual magnitude of Xi Orionis is 4.47,[2] which is bright enough to be seen with the naked eye. The distance to this star, as determined using the parallax method, is roughly 610 light-years.[1]
This is a spectroscopic binary star system with an orbital period of 45.1 days and an eccentricity of 0.26.[5] The primary component is a B-type subgiant star with a stellar classification of B3 IV.[3] With an estimated age of just 32 million years,[3] it has a relatively high rate of spin, showing a projected rotational velocity of 160 km/s.[7] Xi Orionis has about 6.7 times the mass of the Sun,[3] and shines with 1,390 times the solar luminosity from its outer atmosphere at an effective temperatureof15,476 K.[6]
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