Star Theta Boötis B
Red dwarf Theta Boötis B is located 47 light years away from the Sun.
It is a single star of spectral class M2.5V, that has 21 % of solar mass.
For now, there are no known exoplanets in this star system.
Frequently Asked Questions
How far is the Theta Boötis B system from the Sun?
The Theta Boötis B system is 47 light years or 14.5 parsecs from the Sun.
What galaxy is the Theta Boötis B star in?
The Theta Boötis B is in the Milky Way galaxy just like the Sun.
How many stars are in the Theta Boötis B system?
The Theta Boötis B is a single star, there are no other known stars in the system.
What type of star is the Theta Boötis B?
The star Theta Boötis B is a Red dwarf star.
What temperature is the Theta Boötis B?
The primary in the Theta Boötis B system has an effective temperature of K ( °C). 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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