1.69
Apparent Mag2,000
Distance (ly)B0Ia
Spectral Type27,500
Temperature (K)Alnilam is the middle star of Orion's Belt and one of the most luminous stars known. It is a blue supergiant approximately 2,000 light-years away, losing mass rapidly through a strong stellar wind.
Stellar Data
Apparent Magnitude1.69
Absolute Magnitude-6.89
Distance2,000 light-years
Spectral TypeB0Ia
Temperature27,500 K
Luminosity275,000 L☉
Radius42 R☉
Mass40 M☉
Right Ascension05h 36m 12.8s
Declination-01° 12′ 06.9″
ConstellationOrion
Notable Facts
- Alnilam is about 275,000 times more luminous than the Sun
- It is the middle and brightest of the three stars in Orion's Belt
- Its stellar wind is so powerful it loses mass at a significant rate