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AT Coronae Borealis
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Star AT Coronae Borealis

Orange star AT Coronae Borealis is located 76 light years away from the Sun. It is a single star of spectral class K3V, that has typically about 70 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
76 light years
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AT Coronae Borealis

Orange star, BY Draconis variable
Spectral class: K3V

Location +

Ascension iconRight ascension: 16h 6m 29.922s
Declination iconDeclination: 38° 37' 47.492'' (northern hemisphere)
Parallax iconParallax: 43.019
Distance iconSun distance: 75.817 ly | 23.2 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: 80 % M Sun
| 785.7 M Jupiter
 (estimate)
+
Star mass
The mass of the star AT Coronae Borealis is unknown. Based on its other characteristics, it is estimated to be about 80 % 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: 80 % R Sun
| 7.5 R Jupiter
(estimate)
+
Star size
Radius of the star AT Coronae Borealis is not known. Its estimated value based on other similar stars is about 80 % 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: 4800 K
 (estimate)
+
Star temperature
Surface temperature of AT Coronae Borealis is estimated to be 4796 K, which is 83 % 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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AT Coronae Borealis system structure

 AT Coronae Borealis

More about AT Coronae Borealis

Nearby star AT Coronae Borealis 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. AT Coronae Borealis can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia. 

      AT Coronae Borealis 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
V* AT CrB, Gaia EDR3 1379416712336909440
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External sources
simbad icon
Simbad database (V* AT CrB)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 1379416712336909440)
Archive from the Gaia mission

Frequently Asked Questions

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

The AT Coronae Borealis system is 76 light years or 23.2 parsecs from the Sun.

What galaxy is the AT Coronae Borealis star in?

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

How many stars are in the AT Coronae Borealis system?

The AT Coronae Borealis is a single star, there are no other known stars in the system.

What type of star is the AT Coronae Borealis?

The star AT Coronae Borealis is a Orange star star.

What temperature is the AT Coronae Borealis?

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

 LP 275-20
 - 5.9 ly

G 180-9
 - 6.3 ly

Sigma Coronae Borealis
 1 M☉ 6.8 ly

LP 274-24
 - 7 ly

G 180-21
 - 7.4 ly
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