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12 Ophiuchi
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Star 12 Ophiuchi

Orange star 12 Ophiuchi is located 32 light years away from the Sun. It is a single star of spectral class K1 V, that has 91 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
32 light years
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12 Ophiuchi

Orange star, BY Draconis variable
Spectral class: K1 V

Location +

Ascension iconRight ascension: 16h 36m 21.940s
Declination iconDeclination: -2° 19' 33.461'' (equatorial region)
Parallax iconParallax: 101.072
Distance iconSun distance: 32.270 ly | 9.9 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: 91 % M Sun
| 953 M Jupiter
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Star mass
Mass of the star 12 Ophiuchi is 0.91 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: 84 % R Sun
| 8.4 R Jupiter
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Star size
Radius of the star 12 Ophiuchi is 0.84 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: 5200 K
 (estimate)
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Star temperature
Surface temperature of 12 Ophiuchi is estimated to be 5168 K, which is 90 % 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: 1.5 billions years | 0.33 Sun
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Star age
Star 12 Ophiuchi is 1.5 billion years old, which is about 0.33 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: 0.39 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): 5.8
Magnitude iconAbsolute magnitude (V): 5.8
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
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12 Ophiuchi system structure

 12 Ophiuchi

More about 12 Ophiuchi

Nearby star 12 Ophiuchi is a main sequence star that fuses hydrogen atoms into helium. 
      a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface. 12 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. 

      12 Ophiuchi is a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface.
Other designations of this star
12 Oph, BD-01 3220, FK5 1433, GCTP 3773.00, Gliese 631, HD 149661, HIP 81300, HR 6171, LHS 3224, LTT 6632, V2133 Oph, SAO 141269, Gaia EDR3 4358031335898505472
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External sources
simbad icon
Simbad database (* 12 Oph)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 4358031335898505472)
Archive from the Gaia mission

Frequently Asked Questions

How far is the 12 Ophiuchi system from the Sun?

The 12 Ophiuchi system is 32 light years or 9.9 parsecs from the Sun.

What galaxy is the 12 Ophiuchi star in?

The 12 Ophiuchi is in the Milky Way galaxy just like the Sun.

How many stars are in the 12 Ophiuchi system?

The 12 Ophiuchi is a single star, there are no other known stars in the system.

What type of star is the 12 Ophiuchi?

The star 12 Ophiuchi is a Orange star star.

What temperature is the 12 Ophiuchi?

The primary in the 12 Ophiuchi system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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