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55 Cancri
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Star 55 Cancri

Binary star 55 Cancri is located 41 light years away from the Sun. It consists of a yellow star and a red dwarf. There are multiple known exoplanets in this system.
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Sun distance
41 light years
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55 Cancri A

Yellow star, High proper motion star
Spectral class: G8V

Location +

Ascension iconRight ascension: 8h 52m 35.228s
Declination iconDeclination: 28° 19' 47.219'' (northern hemisphere)
Parallax iconParallax: 79.448
Distance iconSun distance: 41.053 ly | 12.6 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: 101.5 % M Sun
| 1063 M Jupiter
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Star mass
Mass of the star 55 Cancri A is 1.015 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: 98 % R Sun
| 9.8 R Jupiter
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Star size
Radius of the star 55 Cancri A is 0.98 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: 5196 K | 0.9 T Sun
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Star temperature
Surface temperature of 55 Cancri A is 5196 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
time icon
Age: 8 billions years | 1.74 Sun
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Star age
Star 55 Cancri A is 8 billion years old, which is about 1.74 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: 0.589 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): 6
Magnitude iconAbsolute magnitude (V): 5.4
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

55 Cancri B

Red dwarf, High proper motion star
Spectral class: M4.5V

Basic characteristic

icon weight
Mass: 25.5 % M Sun
| 267 M Jupiter
+
Star mass
Mass of the star 55 Cancri B is 1.015 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: 27 % R Sun
| 2.7 R Jupiter
+
Star size
Radius of the star 55 Cancri B is 0.273 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: 3320 K | 0.57 T Sun
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Star temperature
Surface temperature of 55 Cancri B is 3320 K, which is 57 % 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: 0.003 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): 13.2
Magnitude iconAbsolute magnitude (V): 12.6
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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55 Cancri system structure

 55 Cancri A
55 Cancri A e 0.02 AU 8.6 M⊕ 1.9 R⊕ 0.7 days
55 Cancri A b 0.11 AU 262.3 M⊕ 14.7 days
55 Cancri A c 0.24 AU 54.3 M⊕ 44.4 days
55 Cancri A f 0.78 AU 49.3 M⊕ 260 days
55 Cancri A d 5.45 AU 1227.1 M⊕ 4867 days
55 Cancri B
55 Cancri B b 0.04 AU 3.5 M⊕ 6.8 days
55 Cancri B c 0.13 AU 5.3 M⊕ 33.7 days

More about 55 Cancri

       55 Cancri 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
Copernicus, LHS 2062, LDS 6219A, GJ 324 A, Gliese 324, HD 75732, Rho1 Cancri, 55 Cnc, BD+28°1660, HIC 43587, HIP 43587, HR 3522, SAO 80585, rho01 Cnc, LFT 609, LTT 12310, NLTT 20414, TIC 332064670, TOI-1773, TYC 1949-2012-1, WISEA J085235.41+281948.5, Gaia EDR3 704967037090946688
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External sources
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simbad icon
Simbad database (* rho01 Cnc B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 704966762213039488)
Archive from the Gaia mission

News from this star system

Geometric model explains the brightness temperature of planet 55 Cancri e
icon13. 8. 2026
Image: Geometric model explains the brightness temperature of planet 55 Cancri e
A new geometric model explains the brightness temperature of 55 Cancri e. By accounting for the planet's rotation and 3D shape, the calculated temperature of 1796 K matches JWST data, supporting the theory that it is a bare rocky world....
Read article tag icon
Thick carbon dioxide atmosphere confirmed for exoplanet 55 Cancri e
icon20. 6. 2026
Image: Thick carbon dioxide atmosphere confirmed for exoplanet 55 Cancri e
New climate simulations confirm exoplanet 55 Cancri e has a thick, carbon dioxide-rich atmosphere. The results, based on JWST data, suggest the planet formed with more volatile substances than Earth and Venus. Atmospheric weather alone does not explain its variability....
Read article tag icon
Tidal heating and magma oceans: How the super-Earth 55 Cancri e maintains its atmosphere
icon3. 2. 2026
Image: Tidal heating and magma oceans: How the super-Earth 55 Cancri e maintains its atmosphere
...
Read article tag icon

Frequently Asked Questions

How far is the 55 Cancri system from the Sun?

The 55 Cancri system is 41 light years or 12.6 parsecs from the Sun.

What galaxy is the 55 Cancri star in?

The 55 Cancri is in the Milky Way galaxy just like the Sun.

How many stars are in the 55 Cancri system?

The 55 Cancri system contains 2 stars.

What type of star is the 55 Cancri?

The primary in the 55 Cancri system is a Yellow star star.

What temperature is star 55 Cancri?

The primary in the 55 Cancri system has a temperature of 5196 K. Find out more about the temperature of stars in Stellar guide
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28. 10. 2026
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WISE J1517+05 flashes powerful radio bursts every 1.149 hours, making it one of the fastest-spinning ultracool dwarfs detected in radio waves. The latest reports also explore how transit changes can reveal a hidden planet in Kepler-88 and map a possible hotspot on WD 1202-024 B. Other findings track helium in V1298 Tau b’s atmosphere and a warped dust ring around CQ Tau.
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