Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Orion |
Pronunciation | /ælˈnaɪlæm/[1] |
Right ascension | 05h 36m 12.8s[2] |
Declination | −01° 12′ 06.9″[2] |
Apparent magnitude (V) | 1.69[3] (1.64 – 1.74[4]) |
Characteristics | |
Evolutionary stage | Blue supergiant |
Spectral type | B0 Ia[5] |
U−B color index | −1.03[3] |
B−V color index | −0.18[3] |
Variable type | α Cygni[4] |
Astrometry | |
Radial velocity (Rv) | 25.9[6] km/s |
Proper motion (μ) | RA: 1.49[2] mas/yr Dec.: −1.06[2] mas/yr |
Parallax (π) | 1.65 ± 0.45 mas[2] |
Distance | approx. 2,000 ly (approx. 600 pc) |
Absolute magnitude (MV) | −6.89[7] |
Details[8] | |
Mass | 40 M☉ |
Radius | 30.62 R☉ |
Luminosity | 419,600 L☉ |
Surface gravity (log g) | 3.02 cgs |
Temperature | 26,540 K |
Rotational velocity (v sin i) | 80 km/s |
Age | 4.47 Myr |
Other designations | |
Database references | |
SIMBAD | data |
Alnilam is the central star of Orion's Belt in the equatorial constellation of Orion. It has the Bayer designation ε Orionis, which is Latinised to Epsilon Orionis and abbreviated Epsilon Ori or ε Ori. This is a massive, blue supergiant star some 2,000 light-years distant. It is estimated to be 419,600 times as luminous as the Sun, and 40 times as massive.
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