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18 Boötis
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Star 18 Boötis

Subgiant 18 Boötis is located 85 light years away from the Sun. It is a single star of spectral class F5IV, that has 131 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
85 light years
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18 Boötis

Subgiant, High proper motion star
Spectral class: F5IV

Location +

Ascension iconRight ascension: 14h 19m 16.398s
Declination iconDeclination: 13° 0' 14.984'' (equatorial region)
Parallax iconParallax: 38.306
Distance iconSun distance: 85.144 ly | 26.1 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: 131 % M Sun
| 1372 M Jupiter
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Star mass
Mass of the star 18 Boötis is 1.31 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: 140 % R Sun
| 13.9 R Jupiter
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Star size
Radius of the star 18 Boötis is 1.4 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: 6731 K | 1.16 T Sun
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Star temperature
Surface temperature of 18 Boötis is 6731 K, which is 116 % 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: 1.154 billions years | 0.25 Sun
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Star age
Star 18 Boötis is 1.154 billion years old, which is about 0.25 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: 3.90 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): 5.4
Magnitude iconAbsolute magnitude (V): 3.3
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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18 Boötis system structure

 18 Boötis

More about 18 Boötis

Nearby star 18 Boötis is is approximately 40 % bigger than the Sun and temperature on its surface is around 6731 K (6458 °C), which is about 116 % of Sun's temperature.
       18 Boötis can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
18 Boo, BD+13°2782, FK5 1372, GJ 3841, HD 125451, HIP 69989, HR 5365, SAO 100975, WDS J14193+1300, Gaia DR3 1226844321337777536
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External sources
simbad icon
Simbad database (* 18 Boo)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 1226844321337777536)
Archive from the Gaia mission

Frequently Asked Questions

How far is the 18 Boötis system from the Sun?

The 18 Boötis system is 85 light years or 26.1 parsecs from the Sun.

What galaxy is the 18 Boötis star in?

The 18 Boötis is in the Milky Way galaxy just like the Sun.

How many stars are in the 18 Boötis system?

The 18 Boötis is a single star, there are no other known stars in the system.

What type of star is the 18 Boötis?

The star 18 Boötis is a Subgiant star.

What temperature is star 18 Boötis?

The star 18 Boötis has an effective temperature of 6731 K. Find out more about the temperature of stars in Stellar guide
Class of stars Subgiant
A subgiant is a term used to describe a luminous star that is typically running out of hydrogen for nuclear fusion and is thus departing from the main sequence. These stars are classified as Yerkes luminosity class IV.
Closest stars

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 - 7.8 ly
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