Cygnus X-1
Cygnus X-1 is a B-type (Blue-White) star located in the constellation Cygnus.
At a distance of roughly 1,941 light-years, Cygnus X-1 is a distant star lying deep within the Milky Way galaxy.
Cygnus X-1 is classified as a spectral class B star (B-type (Blue-White)) on the Harvard spectral classification system.
Cygnus X-1 has an apparent magnitude of +8.84, placing it beyond naked-eye visibility. A good pair of binoculars or a small telescope is required to observe this star. Observers will note its yellow-white hue, which corresponds to a B-V color index of +0.730.
Physical Properties
| Spectral Class | Class B — B-type (Blue-White) |
| Color Index (B−V) | 0.730 |
Observation
| Apparent Magnitude | +8.84 |
| Absolute Magnitude | -0.03 |
| Distance | 1,941 ly |
| Constellation | Cygnus |
Position
| Right Ascension | 19h 58.36m |
| Declination | 35° 12.10′ |
Frequently Asked Questions
What type of star is Cygnus X-1?
Cygnus X-1 is a Class B — B-type (Blue-White) star.
How far is Cygnus X-1 from Earth?
Cygnus X-1 is approximately 1,941.4 light-years from Earth.
Can you see Cygnus X-1 with the naked eye?
With an apparent magnitude of 8.84, Cygnus X-1 is not visible to the naked eye.
What constellation is Cygnus X-1 in?
Cygnus X-1 is located in the constellation Cygnus.