Cygnus X-1

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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 B 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.