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81 Cancri
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Star 81 Cancri

Multiple star system 81 Cancri is located 66 light years away from the Sun. It is a system with 4 stars. For now, there are no known exoplanets in this star system.
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Sun distance
66 light years
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81 Cancri A

Yellow star, Spectroscopic binary
Spectral class: G9V

Location +

Ascension iconRight ascension: 9h 12m 17.550s
Declination iconDeclination: 14° 59' 45.776'' (equatorial region)
Parallax iconParallax: 49.150
Distance iconSun distance: 66.359 ly | 20.3 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: 89 % M Sun
| 932 M Jupiter
+
Star mass
Mass of the star 81 Cancri A is 0.89 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: 90 % R Sun
| 8.8 R Jupiter
(estimate)
+
Star size
Radius of the star 81 Cancri A is not known. Its estimated value based on other similar stars is about 90 % 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: 5200 K
 (estimate)
+
Star temperature
Surface temperature of 81 Cancri A is estimated to be 5232 K, which is 90 % 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: 1.03 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

Magnitude iconApparent magnitude (V): 6.5
Magnitude iconAbsolute magnitude (V): 5
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

81 Cancri B

Orange star, , Spectroscopic binary
Spectral class: K1V

Location +

Distance iconDistance from the primary: 115.4 AU

Basic characteristic

icon weight
Mass: 85 % M Sun
| 890 M Jupiter
+
Star mass
Mass of the star 81 Cancri B is 0.89 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: 80 % R Sun
| 8.1 R Jupiter
(estimate)
+
Star size
Radius of the star 81 Cancri B 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: 5200 K
 (estimate)
+
Star temperature
Surface temperature of 81 Cancri B is estimated to be 5168 K, which is 90 % 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 iconAbsolute magnitude (V): -1.5
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

81 Cancri C

Brown dwarf, , , Spectroscopic binary
Spectral class: L7.5

Location +

Distance iconDistance from the primary: 880 AU

Basic characteristic

icon weight
Mass: 2 % M Sun
| 21 M Jupiter
 (estimate)
+
Star mass
The estimated mass of the star 81 Cancri C is about 2 % of the Sun's mass, or approximately 21 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
| 1.2 R Jupiter
(estimate)
+
Star size
Radius of the star 81 Cancri 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: 1300 K
 (estimate)
+
Star temperature
Surface temperature of 81 Cancri C is estimated to be 1275 K, which is 22 % 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 iconAbsolute magnitude (V): -1.5
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

81 Cancri D

Brown dwarf, , , , Spectroscopic binary
Spectral class: L8.5

Photometry

Magnitude iconAbsolute magnitude (V): -1.5
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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81 Cancri system structure

 81 Cancri A
81 Cancri B 115.4 AU
81 Cancri C 880 AU
81 Cancri D

More about 81 Cancri

       81 Cancri 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
2MASSW J0912145+145940, 2M0912+14, π1 Cnc, 81 Cancri, GJ 337, Gliese 337, HD 79096, HIP 45170, pi.01 Cnc
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Frequently Asked Questions

How far is the 81 Cancri system from the Sun?

The 81 Cancri system is 66 light years or 20.3 parsecs from the Sun.

What galaxy is the 81 Cancri star in?

The 81 Cancri is in the Milky Way galaxy just like the Sun.

How many stars are in the 81 Cancri system?

The 81 Cancri system contains 4 stars.

What type of star is the 81 Cancri?

The primary in the 81 Cancri system is a Yellow star star.

What temperature is the 81 Cancri?

The primary in the 81 Cancri system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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