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Eta Coronae Borealis
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Star Eta Coronae Borealis

Triple star system Eta Coronae Borealis is located 58 light years away from the Sun. It is a system with 3 stars. For now, there are no known exoplanets in this star system.
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Sun distance
58 light years
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Eta Coronae Borealis A

Yellow star
Spectral class: G2V

Location +

Ascension iconRight ascension: 15h 23m 12.233s
Declination iconDeclination: 30° 17' 17.562'' (northern hemisphere)
Parallax iconParallax: 55.980
Distance iconSun distance: 58.263 ly | 17.9 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: 100 % M Sun
| 1079 M Jupiter
 (estimate)
+
Star mass
The mass of the star Eta Coronae Borealis A is unknown. Based on its other characteristics, it is estimated to be about 100 % of the Sun's mass.

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: 110 % R Sun
| 11.1 R Jupiter
(estimate)
+
Star size
Radius of the star Eta Coronae Borealis A is not known. Its estimated value based on other similar stars is about 110 % 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: 5700 K
 (estimate)
+
Star temperature
Surface temperature of Eta Coronae Borealis A is estimated to be 5651 K, which is 99 % 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

Photometry

Magnitude iconApparent magnitude (V): 5.6
Magnitude iconAbsolute magnitude (V): 4.3
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

Eta Coronae Borealis B

Yellow star, Spectroscopic binary
Spectral class: G2V

Basic characteristic

icon weight
Mass: 100 % M Sun
| 1079 M Jupiter
 (estimate)
+
Star mass
The mass of the star Eta Coronae Borealis B is unknown. Based on its other characteristics, it is estimated to be about 100 % of the Sun's mass.

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: 110 % R Sun
| 11.1 R Jupiter
(estimate)
+
Star size
Radius of the star Eta Coronae Borealis B is not known. Its estimated value based on other similar stars is about 110 % 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: 5700 K
 (estimate)
+
Star temperature
Surface temperature of Eta Coronae Borealis B is estimated to be 5651 K, which is 99 % 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

Photometry

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

Eta Coronae Borealis C

Brown dwarf, , Spectroscopic binary
Spectral class: L8

Location +

Distance iconDistance from the primary: 3600 AU

Basic characteristic

icon weight
Mass: 4 % M Sun
| 41.9 M Jupiter
 (estimate)
+
Star mass
The estimated mass of the star Eta Coronae Borealis C is about 4 % of the Sun's mass, or approximately 41.9 Jupiter 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: 10 % R Sun
| 1.1 R Jupiter
(estimate)
+
Star size
Radius of the star Eta Coronae Borealis C is not known. Its estimated value based on other similar stars is about 10 % 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: 1400 K
 (estimate)
+
Star temperature
Surface temperature of Eta Coronae Borealis C is estimated to be 1438 K, which is 24 % 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

Photometry

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 Coronae Borealis system structure

 Eta Coronae Borealis A
Eta Coronae Borealis B
Eta Coronae Borealis C 3600 AU

More about Eta Coronae Borealis

       Eta Coronae Borealis 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
eta CrB C, 2MASSW J1523226+301456, 2 Coronae Borealis, HD 137107, HD 137108, HIP 75312, Gliese 584, HR 5727
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External sources
simbad icon
Simbad database (* eta CrB C)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the Eta Coronae Borealis system from the Sun?

The Eta Coronae Borealis system is 58 light years or 17.9 parsecs from the Sun.

What galaxy is the Eta Coronae Borealis star in?

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

How many stars are in the Eta Coronae Borealis system?

The Eta Coronae Borealis system contains 3 stars.

What type of star is the Eta Coronae Borealis?

The primary in the Eta Coronae Borealis system is a Yellow star star.

What temperature is the Eta Coronae Borealis?

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