Castor B

66Alp Gem

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Castor B is a A-type (White) star located in the constellation Gemini. It carries the designation 66Alp Gem.

Located approximately 51.5 light-years from Earth, Castor B resides within the broader disk of our Milky Way galaxy.

Castor B is classified as a spectral class A star (A-type (White)) on the Harvard spectral classification system.

At an apparent magnitude of +2.85, Castor B is visible to the naked eye under reasonably clear skies. It may require dark-sky conditions to be seen comfortably in areas with significant light pollution.

Physical Properties

Spectral Class A Class A — A-type (White)

Observation

Apparent Magnitude +2.85
Absolute Magnitude 1.86
Distance 51.5 ly
Constellation Gemini

Position

Right Ascension 7h 34.61m
Declination 31° 53.43′

Frequently Asked Questions

What type of star is Castor B?
Castor B is a Class A — A-type (White) star.
How far is Castor B from Earth?
Castor B is approximately 51.6 light-years from Earth.
Can you see Castor B with the naked eye?
With an apparent magnitude of 2.85, Castor B is visible to the naked eye.
What constellation is Castor B in?
Castor B is located in the constellation Gemini.