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Loading contentSigma Orionis is a main-sequence star in the constellation Orion (Orionis), lying about 1,072.9 light-years from Earth.
Class O. Extremely hot, luminous blue stars. They are massive, short-lived, and rare, pouring out ultraviolet light. Such stars have surface temperatures around ≥ 30,000 K and appear blue to the eye.
| Spectral type | O9.5V... |
| Luminosity class | V |
| Apparent magnitude | 3.77 |
| Absolute magnitude | -3.82 |
| Luminosity (Sun = 1) | 2,927 |
| Colour index (B−V) | -0.19 |
| Distance | 1,072.9 ly (328.95 pc) |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
A main-sequence star fuses hydrogen into helium in its core. It will remain on the main sequence for most of its life before evolving into a giant.
Facts on this topic will be cited from these primary and reference sources.
Aggregated, openly-licensed star catalogue combining Hipparcos, the Yale Bright Star Catalogue, and the Gliese Catalogue of Nearby Stars.
High-precision parallax, magnitude, and position for ~118,000 stars.