Star in the constellation Orion, in the center of the Orion's Belt
Alnilam
Location of Alnilam (circled)
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[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
Alnilam, ε Ori, 46 Orionis, Orionis, BD−01°969, FK5 210, HD 37128, HIP 26311, HR 1903, SAO 132346, TD1 4963, 參宿二
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 832,000 times as luminous as the Sun, and 64.5 times as massive.
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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...
in the constellation of Orion. Together with Alnitak (Zeta Orionis) and Alnilam (Epsilon Orionis), the three stars form Orion's Belt, known by many names...
the Sun and is one of the three main stars of Orion's Belt along with Alnilam and Mintaka. The primary star, Alnitak Aa, is a hot blue supergiant with...
Orion Correlation Theory. From left to right: Alnitak on the Great Pyramid of Giza Alnilam on the pyramid of Khafre Mintaka on the pyramid of Menkaure...
supergiant. Particularly massive stars (exceeding 40 solar masses, like Alnilam, the central blue supergiant of Orion's Belt) do not become red supergiants...
Second 1.64 Bellatrix δ Orionis Second 2.23 Mintaka ε Orionis Second 1.69 Alnilam ζ Orionis Second 1.70 Alnitak η Orionis Third 3.42 Algjebbah θ Orionis...
through space, along with the stars of Orion's Belt: Alnitak (Zeta Orionis), Alnilam (Epsilon Orionis), and Mintaka (Delta Orionis). However, this is no longer...
LCCN 71100100. OCLC 472816545. OL 7439054M – via Internet Archive. — (5 May 1987). Alnilam (First ed.). Doubleday. ISBN 978-0-38-506549-8. LCCN 86019699. OCLC 751299075...
Zeta Puppis (Naos), a blue (O-type) supergiant, spectral type O4I(n)fp Alnilam (Epsilon Orionis) B-type supergiant, spectral type B0Ia, central star of...
an-naṣl ('the point' [of the archer's arrow]). /ælˈnæzəl/ Orion ε Orionis Alnilam The middle star in Orion's belt. Derived from Arabic: النظام, romanized: al-niẓām...
Centre de données astronomiques de Strasbourg. Retrieved 2010-06-21. "Alnilam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-21...
Orion Correlation Theory. From left to right: Alnitak on the Great Pyramid of Giza Alnilam on the pyramid of Khafre Mintaka on the pyramid of Menkaure...
Clarke; John Maraganore was the founding CEO. The company was named after Alnilam, a star in Orion's belt. The spelling was modified to make it unique. In...
Bellatrix. Orion OB1b - the three bright stars ζ Ori (Alnitak), ε Ori (Alnilam), and δ Ori (Mintaka) which make up the asterism known as "Orion's Belt"...
3. ex Nr. 55 (1986) David Bennett Thomas: Carla (2012) Guillem Ponsí: Alnilam (2020) Arnold Cooke: Sonatina for Alto Flute and Piano (1985) Tom Febonio:...
64 1.59 Bellatrix Star 1.64 Gacrux Star 1.65 Beta Tauri Star 1.69 1.64 Alnilam Star 1.69 Beta Carinae Star 1.71 1.69 Gamma Velorum Double star 1.71 Alpha...
Correlation Theory. From left to right: Alnitak on the Great Pyramid of Giza, Alnilam on the pyramid of Khafre, and Mintaka on the pyramid of Menkaure...
Stars (asterism), refers to an asterism consisting of Saiph, Alnitak, Alnilam, Mintaka, Betelgeuse, Bellatrix and Rigel. Consequently, the Chinese name...
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