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BY Draconis B
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Star BY Draconis B

Orange star BY Draconis B is located 54 light years away from the Sun. It is a single star of spectral class K7.5Ve, that has 70 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
54 light years
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BY Draconis B

Orange star
Spectral class: K7.5Ve

Basic characteristic

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Mass: 69.7 % M Sun
| 730 M Jupiter
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Star mass
Mass of the star BY Draconis B is 0.697 solar masses.

The mass of a star is the total amount of matter it contains. It is one of the most important properties of a star, as it determines almost everything about how the star lives, changes, and dies. In astronomy, star mass is usually measured in solar masses (M☉) — where 1 solar mass is equal to the mass of our Sun... icon More about Star mass in StellarGuide
temperature iconTemperature: 3900 K
 (estimate)
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Star temperature
Surface temperature of BY Draconis B is estimated to be 3934 K, which is 67 % of the temperature on the surface of the Sun.

The temperature of a star refers to the temperature at its surface, also called the photosphere. It is measured in kelvins (K), the standard unit for temperature in astronomy. A star’s temperature tells us a lot about its physical properties and where it stands in its evolutionary stage... icon More about Star temperature in StellarGuide
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BY Draconis B system structure

 BY Draconis A
BY Draconis B
BY Draconis C 260 AU

More about BY Draconis B

       BY Draconis B can be found in northern celestial hemisphere.
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External sources
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Scientific study, Accepted: 29. 12. 2026
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A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
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Peering into the Midplane of the DM Tau Disk using N2H+ and DCO+
Scientific study, Accepted: 13. 10. 2026

News from this star system

Molecular emission in the disk around DM Tauri reveals complex chemical processes
iconYesterday
Image: Molecular emission in the disk around DM Tauri reveals complex chemical processes
Observations of the disk around DM Tauri reveal how N2H+ and DCO+ molecules are distributed. The data show that external UV radiation and cosmic rays influence the chemical makeup of the disk out to 400 astronomical units, impacting how planets may form....
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Narrow ring of gas found near the young star HD 152384
iconYesterday
Image: Narrow ring of gas found near the young star HD 152384
A narrow ring of gas has been characterized around the young star HD 152384. Located at the dust sublimation radius, the ring likely formed from the collisions of rocky planetesimals, offering a new look at early planetary system evolution....
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Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconYesterday
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
New observations of hot Jupiter KELT-2A b confirm water vapor in its atmosphere. The planet shows a carbon-to-oxygen ratio similar to its host star but with overall lower metallicity, suggesting a complex migration history from far out in its star system....
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Frequently Asked Questions

How far is the BY Draconis B system from the Sun?

The BY Draconis B system is 54 light years or 16.6 parsecs from the Sun.

What galaxy is the BY Draconis B star in?

The BY Draconis B is in the Milky Way galaxy just like the Sun.

How many stars are in the BY Draconis B system?

The BY Draconis B is a single star, there are no other known stars in the system.

What type of star is the BY Draconis B?

The star BY Draconis B is a Orange star star.

What temperature is the BY Draconis B?

The primary in the BY Draconis B system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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icon 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.
Estimated values
icon 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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Stellar Catalog brings the stars from our galaxy to you. Discover their position, physical properties and whether there are any exoplanets or disks orbiting them. The data in Stellar Catalog come from respectable sources like Gaia space telescope, or SIMBAD database.
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