Alnilam
Star in the constellation Orion, in the center of the Orion's Belt / From Wikipedia, the free encyclopedia
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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 832,000 times as luminous as the Sun, and 64.5 times as massive.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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 | |
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 | |
Mass | 64.5[8] M☉ |
Radius | 42.0[8] R☉ |
Luminosity | 832,000[8] L☉ |
Surface gravity (log g) | 3.0[8] cgs |
Temperature | 27,000±500[8] K |
Rotational velocity (v sin i) | 40–70[8] km/s |
Age | 5.7[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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