Alnilam
blue supergiant star
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Summary
Alnilam is a blue supergiant[1]. Alnilam draws 2,179 Wikipedia views per month (blue supergiant category, ranking #1 of 9).[2]
Key Facts
- Instance of: pulsating variable star[3], navigational star[4], near-infrared source[5], ultraviolet source[6]
- Constellation: Orion[7]
- Spectral class: B0Ia[8]
- Part of: Orion's Belt[9]
- Commons category: Alnilam[10]
- Catalog code: SAO 132346[11], 2MASS J05361280-0112070[12], HD 37128[13], HIP 26311[14], HR 1903[15], IRAS 05336-0113[16], ε Ori[17], 46 Ori[18], 1RXS J053612.8-011201[19], CCDM J05363-0112A[20], CEL 852[21], EUVE J0536-01.1[22], FK5 210[23], GC 6960[24]
- Type of variable star: Alpha Cygni variable[25]
- Apparent magnitude: 0.48[26], 1.51[27], 1.69[28], 1.76[29], 1.93[30], 2.07[31], 2.16[32]
- Absolute magnitude: -6.95[33]
- Luminosity: 832,000 solar luminosity[34]
- Mass: 34.6 solar mass[35]
- Radius: 24 solar radius[36]
- Parallax: 1.65 milliarcsecond[37]
- Radial velocity: 27.30 kilometre per second[38]
- Distance from Earth: 366 parsec[39]
- Stellar rotational velocity: 55 kilometre per second[40]
- Right ascension: 84.053388941 degree[41]
- Declination: -1.201919136 degree[42]
- Epoch: J2000.0[43]
- Effective temperature: 24,670 K[44]
- Surface gravity: 700 centimetre per square second[45]
- Age estimated by a dating method: 5.7 megaannum[46]
- Declination component of proper motion: -0.78 milliarcsecond per year[47]
- Right ascension component of proper motion: 1.44 milliarcsecond per year[48]
Why It Matters
Alnilam has Wikipedia articles in 26 language editions, a strong signal of global cultural recognition.[49] Alnilam is known by 27 alternative names across languages and contexts.[50]