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Alpha Ophiuchi B
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Star Alpha Ophiuchi B

Orange star Alpha Ophiuchi B is located 49 light years away from the Sun. It is a single star of spectral class K5-7V, that has 85 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
49 light years
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Alpha Ophiuchi B

Orange star
Spectral class: K5-7V

Basic characteristic

icon weight
Mass: 85 % M Sun
| 890 M Jupiter
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Star mass
Mass of the star Alpha Ophiuchi B is 0.85 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: 90 % R Sun
| 8.6 R Jupiter
(estimate)
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Star size
Radius of the star Alpha Ophiuchi B is not known. Its estimated value based on other similar stars is about 90 % 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 iconTemperature: 4400 K
 (estimate)
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Star temperature
Surface temperature of Alpha Ophiuchi B is estimated to be 4434 K, which is 76 % 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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Alpha Ophiuchi B system structure

 Alpha Ophiuchi A
Alpha Ophiuchi B

More about Alpha Ophiuchi B

       Alpha Ophiuchi 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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News from this star system

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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HD 158485 revealed as a binary system containing two pulsating stars
iconYesterday
Image: HD 158485 revealed as a binary system containing two pulsating stars
HD 158485, a calibration star for the James Webb Space Telescope, is actually a binary system. Observations from TESS show two pulsating stars orbiting each other every 382.8 days, which helps refine absolute-flux measurements for astronomical data....
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Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
iconYesterday
Image: Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
Researchers have detected metastable helium escaping from the ultrahot Jupiter KELT-18 b. This confirms the massive gas giant is undergoing active atmospheric photoevaporation. KELT-18 b is now the most massive planet found with this specific helium signature....
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Frequently Asked Questions

How far is the Alpha Ophiuchi B system from the Sun?

The Alpha Ophiuchi B system is 49 light years or 14.9 parsecs from the Sun.

What galaxy is the Alpha Ophiuchi B star in?

The Alpha Ophiuchi B is in the Milky Way galaxy just like the Sun.

How many stars are in the Alpha Ophiuchi B system?

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

What type of star is the Alpha Ophiuchi B?

The star Alpha Ophiuchi B is a Orange star star.

What temperature is the Alpha Ophiuchi B?

The primary in the Alpha Ophiuchi 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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icon Stellar Catalog is continuously updated with new information from research papers. Stellar and planetary data are validated by automatic processes as well as humans.
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