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T Coronae Borealis
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Star T Coronae Borealis

Recurrent nova T Coronae Borealis is located 2987 light years away from the Sun. It consists of a red giant and a white dwarf.
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Sun distance
2987 light years
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T Coronae Borealis A

Red giant
Spectral class: M3III

Location +

Ascension iconRight ascension: 15h 59m 30.162s
Declination iconDeclination: 25° 55' 12.806'' (northern hemisphere)
Parallax iconParallax: 1.092
Distance iconSun distance: 2,986.904 ly | 915.8 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: 112 % M Sun
| 1173 M Jupiter
+
Star mass
Mass of the star T Coronae Borealis A is 1.12 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: 7500 % R Sun
| 746.3 R Jupiter
+
Star size
Radius of the star T Coronae Borealis A is 75 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: 3600 K | 0.62 T Sun
+
Star temperature
Surface temperature of T Coronae Borealis A is 3600 K, which is 62 % 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
luminosity icon
Luminosity: 655 L Sun
+
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

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

T Coronae Borealis B

White dwarf

Location +

Distance iconDistance from the primary: 0.54 AU

Basic characteristic

icon weight
Mass: 137 % M Sun
| 1435 M Jupiter
+
Star mass
Mass of the star T Coronae Borealis B is 1.12 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
temperature iconTemperature: 3600 K
 (estimate)
+
Star temperature
Surface temperature of T Coronae Borealis B is estimated to be 3600 K, which is 62 % 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
luminosity icon
Luminosity: 100 L Sun
+
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

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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T Coronae Borealis system structure

 T Coronae Borealis A
T Coronae Borealis B 0.54 AU

More about T Coronae Borealis

       T 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.
Other designations of this star
BD+26° 2765, HD 143454, HIP 78322, SAO 84129, 2MASS J15593015+2555126, T CrB, Gaia DR3 1220110705972528512
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Frequently Asked Questions

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

The T Coronae Borealis system is 2987 light years or 915.8 parsecs from the Sun.

What galaxy is the T Coronae Borealis star in?

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

How many stars are in the T Coronae Borealis system?

The T Coronae Borealis system contains 2 stars.

What type of star is the T Coronae Borealis?

The primary in the T Coronae Borealis system is a Red giant star.

What temperature is star T Coronae Borealis?

The primary in the T Coronae Borealis system has a temperature of 3600 K. Find out more about the temperature of stars in Stellar guide
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