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Rho Geminorum
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Star Rho Geminorum

Triple star system Rho Geminorum 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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Rho Geminorum A

Yellow-White star, High proper motion star
Spectral class: F1V

Location +

Ascension iconRight ascension: 7h 29m 6.911s
Declination iconDeclination: 31° 47' 7.568'' (northern hemisphere)
Parallax iconParallax: 56.112
Distance iconSun distance: 58.126 ly | 17.8 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: 135.5 % M Sun
| 1419 M Jupiter
+
Star mass
Mass of the star Rho Geminorum A is 1.355 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: 166 % R Sun
| 16.5 R Jupiter
+
Star size
Radius of the star Rho Geminorum A is 1.655 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: 6899 K | 1.19 T Sun
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Star temperature
Surface temperature of Rho Geminorum A is 6899 K, which is 119 % 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: 2.1 billions years | 0.46 Sun
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Star age
Star Rho Geminorum A is 2.1 billion years old, which is about 0.46 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: 5.542 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): 4.2
Magnitude iconAbsolute magnitude (V): 2.9
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

Rho Geminorum B

Red dwarf, , High proper motion star
Spectral class: M5

Basic characteristic

icon weight
Mass: 40 % M Sun
| 366.6 M Jupiter
 (estimate)
+
Star mass
The mass of the star Rho Geminorum B is unknown. Based on its other characteristics, it is estimated to be about 40 % 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: 40 % R Sun
| 4 R Jupiter
(estimate)
+
Star size
Radius of the star Rho Geminorum B is not known. Its estimated value based on other similar stars is about 40 % 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: 3400 K
 (estimate)
+
Star temperature
Surface temperature of Rho Geminorum B is estimated to be 3433 K, which is 59 % 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): 12.5
Magnitude iconAbsolute magnitude (V): 11.2
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

Rho Geminorum C

Orange star, BY Draconis variable
Spectral class: K2.5V

Basic characteristic

icon weight
Mass: 77 % M Sun
| 807 M Jupiter
+
Star mass
Mass of the star Rho Geminorum C is 0.35 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
| 7.5 R Jupiter
(estimate)
+
Star size
Radius of the star Rho Geminorum C 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 icon
Temperature: 4948 K | 0.86 T Sun
+
Star temperature
Surface temperature of Rho Geminorum C is 4948 K, which is 86 % 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): 7.7
Magnitude iconAbsolute magnitude (V): 6.4
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
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Rho Geminorum system structure

 Rho Geminorum A
Rho Geminorum B
Rho Geminorum C

More about Rho Geminorum

      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. Rho Geminorum 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. 

      Rho Geminorum 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
ρ Gem C, HIP 36357, BD+32° 1561, Gliese 273.1, V376 Gem, Gliese 274 B, ρ Gem B, ρ Gem A, 62 Gem, BD+32° 1562, HD 58946, HIP 36366, Gliese 274A, GJ 274 A, HR 2852, Gaia EDR3 892160231749198848
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External sources
simbad icon
Simbad database (V* V376 Gem)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 892215482207937152)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Rho Geminorum system from the Sun?

The Rho Geminorum system is 58 light years or 17.8 parsecs from the Sun.

What galaxy is the Rho Geminorum star in?

The Rho Geminorum is in the Milky Way galaxy just like the Sun.

How many stars are in the Rho Geminorum system?

The Rho Geminorum system contains 3 stars.

What type of star is the Rho Geminorum?

The primary in the Rho Geminorum system is a Yellow-White star star.

What temperature is star Rho Geminorum?

The primary in the Rho Geminorum system has a temperature of 6899 K. Find out more about the temperature of stars in Stellar guide
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