Star Castor Cb
Red dwarf Castor Cb is located 51 light years away from the Sun.
It is a single star of spectral class dM1e, that has 60 % of solar mass.
For now, there are no known exoplanets in this star system.
Frequently Asked Questions
How far is the Castor Cb system from the Sun?
The Castor Cb system is 51 light years or 15.6 parsecs from the Sun.
What galaxy is the Castor Cb star in?
The Castor Cb is in the Milky Way galaxy just like the Sun.
How many stars are in the Castor Cb system?
The Castor Cb is a single star, there are no other known stars in the system.
What type of star is the Castor Cb?
The star Castor Cb is a Red dwarf star.
What temperature is star Castor Cb?
The star Castor Cb has an effective temperature of 3820 K. Find out more about the temperature of stars in
Stellar guide
Class of stars Red dwarf
Red dwarfs are small, cool stars with surface temperatures of about 2,000–3,800 K, much cooler than the Sun. They usually have 8–50% of the Sun’s mass and shine very faintly, sometimes at just a tiny fraction of the Sun’s brightness. Classified mainly as spectral type M, they are the most common stars in the Milky Way, making up roughly 70–75% of its stellar population.
They fuse hydrogen slowly through the proton–proton chain and are fully convective, which allows them to use their fuel very efficiently. As a result, red dwarfs can live for tens of billions to trillions of years—far longer than the Sun. Many exoplanets orbit red dwarfs, including some in close habitable zones, though strong stellar activity can affect planetary environments.
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Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.
Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.
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