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Stellar Catalog
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b Ophiuchi
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Star b Ophiuchi

Blue Giant b Ophiuchi is located 81 light years away from the Sun. It is a single star of spectral class kA5hA9mF1III, that has 177 % of solar mass. For now, there are no known exoplanets in this star system.
Sun distance
81 light years
galaxy map

b Ophiuchi

Blue Giant, High proper motion star
Spectral class: kA5hA9mF1III

Location +

Ascension iconRight ascension: 17h 26m 22.218s
Declination iconDeclination: -24° 10' 32.984'' (southern hemisphere)
Parallax iconParallax: 40.027
Distance iconSun distance: 81.484 ly | 25 pc
Star position
The position of a star tells us where it appears in the sky, similar to how we use coordinates like latitude and longitude on Earth. In astronomy, the three main coordinates are right ascension, declination and distance. .. icon More about Star position in StellarGuide

Basic characteristic

icon weight
Mass: 177 % M Sun
| 1854 M Jupiter
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Star mass
Mass of the star b Ophiuchi is 1.77 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: 190 % R Sun
| 18.9 R Jupiter
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Star size
Radius of the star b Ophiuchi is 1.9 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: 7559 K | 1.31 T Sun
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Star temperature
Surface temperature of b Ophiuchi is 7559 K, which is 131 % 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
time icon
Age: 1.028 billions years | 0.22 Sun
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Star age
Star b Ophiuchi is 1.028 billion years old, which is about 0.22 of the Sun's age.

The age of a star tells us how long it has been shining since it formed. Knowing a star’s age helps astronomers understand its life stage, how it has changed over time, and what will happen to it in the future... icon More about Star age in StellarGuide
luminosity icon
Luminosity: 13 L Sun
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Star luminosity
Luminosity is the total amount of energy a star gives off every second. Think of it as the star’s true brightness — not just how bright it looks from Earth. This is important because some stars may appear dim simply because they are far away, not because they’re actually faint... icon More about Star luminosity in StellarGuide

Photometry

Magnitude iconApparent magnitude (V): 4.2
Magnitude iconAbsolute magnitude (V): 2.2
Absolute stellar magnitude in different parts of the electromagnetic spectrum from infrared (K band) to ultraviolet (U band).
5
10
15
20
25
30
35
K
2.1
H
1.6
J
1.2
Grp
0.8
I
0.8
G
0.6
V
0.5
Gbp
0.5
B
0.4
U
0.3
More about b Ophiuchi
Nearby star b Ophiuchi is is approximately 90 % bigger than the Sun and temperature on its surface is around 7559 K (7286 °C), which is about 131 % of Sun's temperature.
       b Ophiuchi can be found in southern celestial hemisphere, and it is possible to see it with naked eye. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
b Oph, 44 Oph, CD−24°13337, FK5 1457, GC 23597, GJ 9591, Gliese 9591, HD 157792, HIP 85340, HR 6486, SAO 185401, TYC 6825-462-1, NSV 8640, Gaia EDR3 4111251723554095104
External sources
simbad icon
Simbad database (* b Oph)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 4111251723554095104)
Archive from the Gaia mission
Closest stars

 2MASS J17262200-2410487
 - 0.9 ly

Gaia EDR3 4109836033549438080
 - 3.2 ly

Gaia EDR3 4109834178125157760
 - 3.4 ly

Gaia EDR3 4068260647082551424
 - 4 ly

Gaia EDR3 4114370350791405696
 - 4.2 ly
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