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Delta Geminorum
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Star Delta Geminorum

Binary star Delta Geminorum is located 61 light years away from the Sun. It consists of a yellow-white star and a orange star. For now, there are no known exoplanets in this star system.
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Sun distance
61 light years
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Delta Geminorum A

Yellow-White star, Spectroscopic binary
Spectral class: F2VkF0mF0

Location +

Ascension iconRight ascension: 7h 20m 7.344s
Declination iconDeclination: 21° 58' 56.059'' (northern hemisphere)
Parallax iconParallax: 53.769
Distance iconSun distance: 60.659 ly | 18.6 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: 157 % M Sun
| 1645 M Jupiter
+
Star mass
Mass of the star Delta Geminorum A is 1.57 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: 200 % R Sun
| 19.4 R Jupiter
(estimate)
+
Star size
Radius of the star Delta Geminorum A is not known. Its estimated value based on other similar stars is about 200 % 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: 6900 K | 1.19 T Sun
+
Star temperature
Surface temperature of Delta Geminorum A is 6900 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: 1.6 billions years | 0.35 Sun
+
Star age
Star Delta Geminorum A is 1.6 billion years old, which is about 0.35 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

Photometry

Magnitude iconApparent magnitude (V): 3.5
Magnitude iconAbsolute magnitude (V): 2.2
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

Delta Geminorum B

Orange star
Spectral class: K6V

Basic characteristic

icon weight
Mass: 70 % M Sun
| 764.7 M Jupiter
 (estimate)
+
Star mass
The mass of the star Delta Geminorum B is unknown. Based on its other characteristics, it is estimated to be about 70 % 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
| 7.6 R Jupiter
(estimate)
+
Star size
Radius of the star Delta Geminorum 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: 4000 K
 (estimate)
+
Star temperature
Surface temperature of Delta Geminorum B is estimated to be 4024 K, which is 69 % 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): 8.2
Magnitude iconAbsolute magnitude (V): 6.8
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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Delta Geminorum system structure

 Delta Geminorum A
Delta Geminorum B

More about Delta Geminorum

       Delta 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.
Other designations of this star
del gam, Wasat, 55 Geminorum, BD+22° 1645, FK5 279, Gliese 271, Gl 271, HD 56986, HIP 35550, HR 2777, SAO 79294, Gaia DR3 866177431955478144
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External sources
simbad icon
Simbad database (* del Gem B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia DR3 866177431955017600)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Delta Geminorum system from the Sun?

The Delta Geminorum system is 61 light years or 18.6 parsecs from the Sun.

What galaxy is the Delta Geminorum star in?

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

How many stars are in the Delta Geminorum system?

The Delta Geminorum system contains 2 stars.

What type of star is the Delta Geminorum?

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

What temperature is star Delta Geminorum?

The primary in the Delta Geminorum system has a temperature of 6900 K. Find out more about the temperature of stars in Stellar guide
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