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Castor Ba
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Star Castor Ba

White-Blue star Castor Ba is located 51 light years away from the Sun. It is a single star of spectral class A2Vm, that has 298 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
51 light years
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Castor Ba

White-Blue star
Spectral class: A2Vm

Basic characteristic

icon weight
Mass: 298 % M Sun
| 3122 M Jupiter
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Star mass
Mass of the star Castor Ba is 2.98 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
radius icon
Size: 330 % R Sun
| 32.8 R Jupiter
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Star size
Radius of the star Castor Ba is 3.3 solar radii.

The size of a star refers to its radius — the distance from its center to its surface. Star size is usually measured in solar radii (R☉), where 1 solar radius equals approximately 696,000 kilometers. Depending on their type and life stage, stars can be much smaller or larger than the Sun... icon More about Star size in StellarGuide
temperature icon
Temperature: 8842 K | 1.53 T Sun
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Star temperature
Surface temperature of Castor Ba is 8842 K, which is 153 % 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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Castor Ba system structure

 Castor Aa
Castor Ab
Castor Ba
Castor Bb
Castor Ca
Castor Cb

More about Castor Ba

Castor Ba is is approximately 3 times bigger than the Sun and temperature on its surface is around 8842 K (8569 °C), which is about 153 % of Sun's temperature.
       Castor Ba can be found in northern celestial hemisphere.
Other designations of this star
BD+32°1581B, HR 2890, HD 60178
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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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News from this star system

Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
iconToday
Image: Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
New observations from the James Webb Space Telescope show periodic transit timing variations in the Neptune-like planet HAT-P-18 b. The data indicates an orbital timing shift of 92.9 seconds, providing fresh insights into the dynamics of this distant system....
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Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
iconToday
Image: Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
The exoplanet TOI-2257 b orbits its star once every 35 days with a high eccentricity. New models suggest its atmospheric and orbital fate depends on whether it is a gas-rich mini-Neptune or a rocky super-Earth. Higher eccentricity would confirm a gaseous nature....
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Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
iconYesterday
Image: Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
Massive brown dwarf HD 203771 b confirmed in an eccentric orbit around an orange dwarf star. New mass measurements place the companion at approximately 70 times the mass of Jupiter, revealing insights into how brown dwarfs migrate inward over time....
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Frequently Asked Questions

How far is the Castor Ba system from the Sun?

The Castor Ba system is 51 light years or 15.6 parsecs from the Sun.

What galaxy is the Castor Ba star in?

The Castor Ba is in the Milky Way galaxy just like the Sun.

How many stars are in the Castor Ba system?

The Castor Ba is a single star, there are no other known stars in the system.

What type of star is the Castor Ba?

The star Castor Ba is a White-Blue star star.

What temperature is star Castor Ba?

The star Castor Ba has an effective temperature of 8842 K. Find out more about the temperature of stars in Stellar guide
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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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