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Eta Boötis
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Star Eta Boötis

Subgiant Eta Boötis is located 37 light years away from the Sun. It is suspected double or multiple star of spectral class G0IV, that has 171 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
37 light years
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Eta Boötis

Subgiant, Spectroscopic binary
Spectral class: G0IV

Location +

Ascension iconRight ascension: 13h 54m 41.085s
Declination iconDeclination: 18° 23' 51.795'' (equatorial region)
Parallax iconParallax: 87.750
Distance iconSun distance: 37.169 ly | 11.4 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: 171 % M Sun
| 1791 M Jupiter
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Star mass
Mass of the star Eta Boötis is 1.71 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: 267 % R Sun
| 26.6 R Jupiter
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Star size
Radius of the star Eta Boötis is 2.672 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: 6155 K | 1.07 T Sun
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Star temperature
Surface temperature of Eta Boötis is 6155 K, which is 107 % 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: 2.7 billions years | 0.59 Sun
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Star age
Star Eta Boötis is 2.7 billion years old, which is about 0.59 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: 8.89 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): 2.7
Magnitude iconAbsolute magnitude (V): 2.4
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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Eta Boötis system structure

 Eta Boötis

More about Eta Boötis

Nearby star Eta Boötis is is approximately 3 times bigger than the Sun and temperature on its surface is around 6155 K (5882 °C), which is about 107 % of Sun's temperature.
       Eta 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
Muphrid, Saak, 8 Boötis, Gl 534, GJ 534, Gliese 534, HR 5235, BD +19°2725, HD 121370, LTT 14060, GCTP 3175.00, SAO 100766, FK5 513, HIP 67927, WDS J13547+1824, * eta Boo, 8 Boo, FK5 513, 2MASS J13544106+1823514, TIC 367758676, TYC 1470-1157-1, WDS J13547+1824A
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External sources
simbad icon
Simbad database (* eta Boo)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the Eta Boötis system from the Sun?

The Eta Boötis system is 37 light years or 11.4 parsecs from the Sun.

What galaxy is the Eta Boötis star in?

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

How many stars are in the Eta Boötis system?

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

What type of star is the Eta Boötis?

The star Eta Boötis is a Subgiant star.

What temperature is star Eta Boötis?

The star Eta Boötis has an effective temperature of 6155 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.
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