  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion |
| μ Ori A | |
| Right ascension | 06h 02m 22.997s[1] |
| Declination | +09° 38′ 50.24″[1] |
| Apparent magnitude (V) | 4.30[2] |
| μ Ori B | |
| Right ascension | 06h 02m 23.009s[1] |
| Declination | +09° 38′ 50.52″[1] |
| Apparent magnitude (V) | 6.27[2] |
| Characteristics | |
| μ Ori A | |
| Spectral type | A1 Vm |
| U−Bcolor index | +0.11[3] |
| B−Vcolor index | +0.14[3] |
| μ Ori B | |
| Spectral type | F2 V |
| U−Bcolor index | +0.00[3] |
| B−Vcolor index | +0.43[3] |
| Astrometry | |
| Radial velocity (Rv) | 0.00[4] km/s |
| Proper motion (μ) | RA: 10.43[5]mas/yr Dec.: −39.09[5]mas/yr |
| Parallax (π) | 21.69±0.13 mas[6] |
| Distance | 150.4 ± 0.9 ly (46.1 ± 0.3 pc) |
| Absolute magnitude (MV) | Aa: 0.93 Ba: 3.53 Bb: 3.53[3] |
| Orbit[6] | |
| Primary | μ Ori A |
| Companion | 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[6] | |
| Primary | μ Ori Aa |
| Companion | 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[6] | |
| Primary | μ Ori Ba |
| Companion | 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[3][6] | |
| 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[7] km/s |
| Age | 282[8] 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 toMu Orionis, abbreviated toμ Ori orMu Ori) is a quadruple star system[6] in the constellationOrion, similar toMizar andEpsilon 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 anarcsecond apart. The entire system is located approximately 150light years from theSun.
Mu Orionis Aa is an A5V dwarf andmetallic line star, ofeffective temperature8,350 Kelvin, andapparent magnitude of +4.31. Mu Orionis Aa has 2.1 solar masses, and a radius of 2.9 R☉ and a luminosity 32 timesthat of the Sun.
Mu Orionis Ab is a G5V dwarf orbiting Aa at a distance of0.077 AU, 0.2x the orbit ofMercury.
Mu Orionis Ba and Bb are F5V dwarfs with 1.4solar masses and apparent magnitudes of 6.91. They are separated from each other by0.078 AU.
