Mu Orionis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion |
| μ Ori A | |
| Right ascension | 06h 02m 22.997s |
| Declination | +09° 38′ 50.24″ |
| Apparent magnitude (V) | 4.30 |
| μ Ori B | |
| Right ascension | 06h 02m 23.009s |
| Declination | +09° 38′ 50.52″ |
| Apparent magnitude (V) | 6.27 |
| Characteristics | |
| μ Ori A | |
| Spectral type | A1 Vm |
| U−B color index | +0.11 |
| B−V color index | +0.14 |
| μ Ori B | |
| Spectral type | F2 V |
| U−B color index | +0.00 |
| B−V color index | +0.43 |
| Astrometry | |
| Radial velocity (Rv) | 0.00 km/s |
| Proper motion (μ) | RA: 10.43 mas/yr Dec.: −39.09 mas/yr |
| Parallax (π) | 21.69±0.13 mas |
| Distance | 150.4 ± 0.9 ly (46.1 ± 0.3 pc) |
| Absolute magnitude (MV) | Aa: 0.93 Ba: 3.53 Bb: 3.53 |
| Orbit | |
| Primary | μ Ori A |
| Name | μ Ori B |
| Period (P) | 6,813.8±1.2 d |
| Semi-major axis (a) | 0.2737±0.0021" (12.620±0.057 AU) |
| Eccentricity (e) | 0.7410±0.0011 |
| Inclination (i) | 96.028±0.028° |
| Orbit | |
| Primary | μ Ori Aa |
| Name | μ Ori Ab |
| Period (P) | 4.4475849 days |
| Semi-major axis (a) | 0.001661±0.000013" (0.07659±0.00058 AU) |
| Eccentricity (e) | 0.0037±0.0014 |
| Inclination (i) | 47.1±9.0° |
| Semi-amplitude (K1) (primary) | 1.03±0.26 km/s |
| Semi-amplitude (K2) (secondary) | > 4.58 km/s |
| Orbit | |
| Primary | μ Ori Ba |
| Name | μ Ori Bb |
| Period (P) | 4.7835349 days |
| Semi-major axis (a) | 0.001688±0.000013" (0.07659±0.00036 AU) |
| Eccentricity (e) | 0.0016±0.0014 |
| Inclination (i) | 110.71±0.73° |
| Semi-amplitude (K1) (primary) | 1.72±0.26 km/s |
| Semi-amplitude (K2) (secondary) | 2.02±0.26 km/s |
| Details | |
| μ Ori Aa | |
| Mass | 2.38 M☉ |
| Radius | 2.85 R☉ |
| Luminosity | 32.2 L☉ |
| Temperature | 8,300 K |
| Rotational velocity (v sin i) | 10 km/s |
| Age | 282 Myr |
| μ Ori Ab | |
| Mass | 0.652 M☉ |
| μ Ori Ba | |
| Mass | 1.389 M☉ |
| Radius | 1.33 R☉ |
| Luminosity | 3.0 L☉ |
| Temperature | 6,600 K |
| μ Ori Bb | |
| Mass | 1.356 M☉ |
| Radius | 1.33 R☉ |
| Luminosity | 3.0 L☉ |
| Temperature | 6,600 K |
| Other designations | |
| Mu Orionis, Mu Ori, μ Orionis, μ Ori, 61 Orionis, 61 Ori, HR 2124, HD 40932, HIP 28614, BD+09°1064, ADS 4617, WDS J06024+0939, 2MASS J05351889-0516140 | |
| Database references | |
| SIMBAD | data |
| data2 | |
| data3 | |
μ Orionis (Latinised to Mu Orionis, abbreviated to μ Ori or Mu Ori) is a quadruple star system in the constellation Orion, similar to Mizar and Epsilon Lyrae with combined visual magnitude of 4.13. The four stars are known as Mu Orionis Aa, Mu Orionis Ab, Mu Orionis Ba, and Mu Orionis Bb. The A and B systems are several tenths of an arcsecond apart. The entire system is located approximately 150 light years from the Sun.