![]() Alnitak (in lower right corner) and Flame Nebula |
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Observation data Epoch J2000 Equinox J2000 |
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Constellation | Orion |
Right ascension | 05h 40m 45.5s |
Declination | −01° 56′ 34″ |
Apparent magnitude (V) | 2.0/~4/4.21 |
Characteristics | |
Spectral type | O9 Iab/O9/B0 III |
U−B color index | −1.07 |
B−V color index | 0.14 / ? / −0.01 |
Astrometry | |
Radial velocity (Rv) | 18 km/s |
Proper motion (μ) | RA: 3.19 mas/yr Dec.: 2.03 mas/yr |
Parallax (π) | 4.43 ± 0.64 mas |
Distance | approx. 700 ly (approx. 230 pc) |
Absolute magnitude (MV) | −5.25/−3/−2.8 |
Details | |
Mass | 28/23/20 M☉ |
Radius | 20/? R☉ |
Luminosity | 100,000/1,300/? L☉ |
Temperature | 30,000/?/24,000 K |
Metallicity | ? |
Rotation | 140 km/s / ? |
Age | ? years |
Other designations | |
ζ Orionis, 50 Orionis, 126 G. Orionis, HR 1948/9, BD −02°1338, HD 37742, SAO 132444, HIP 26727, TD1 5127, 參宿一.
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Database references | |
SIMBAD | data |