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Loading contentCygnus X-1 is a blue supergiant in the constellation Cygnus (Cygni), lying about 1,941.4 light-years from Earth.
Class B. Hot, blue-white stars. Massive and luminous, they often light up the regions where they form. Such stars have surface temperatures around 10,000–30,000 K and appear blue-white to the eye.
| Spectral type | B0Ib |
| Luminosity class | Ib |
| Apparent magnitude | 8.84 |
| Absolute magnitude | -0.03 |
| Luminosity (Sun = 1) | 89.784 |
| Colour index (B−V) | 0.73 |
| Distance | 1,941.4 ly (595.24 pc) |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
A blue supergiant is among the most luminous stars known — enormous, hot, and massive. Many end their lives as supernovae.
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.