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39 Leonis
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Star 39 Leonis

Binary star 39 Leonis is located 73 light years away from the Sun. It consists of a red dwarf and a yellow-white star. For now, there are no known exoplanets in this star system.
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Sun distance
73 light years
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39 Leonis A

Yellow-White star, High proper motion star
Spectral class: F6V

Location +

Ascension iconRight ascension: 10h 17m 14.061s
Declination iconDeclination: 23° 6' 20.815'' (northern hemisphere)
Parallax iconParallax: 44.901
Distance iconSun distance: 72.639 ly | 22.3 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: 98 % M Sun
| 1027 M Jupiter
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Star mass
Mass of the star 39 Leonis A is 0.98 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: 99 % R Sun
| 9.9 R Jupiter
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Star size
Radius of the star 39 Leonis A is 0.99 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: 6118 K | 1.06 T Sun
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Star temperature
Surface temperature of 39 Leonis A is 6118 K, which is 106 % 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: 6.3 billions years | 1.37 Sun
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Star age
Star 39 Leonis A is 6.3 billion years old, which is about 1.37 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: 2.19 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): 5.8
Magnitude iconAbsolute magnitude (V): 4.1
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

39 Leonis B

Red dwarf, High proper motion star
Spectral class: M1

Location +

Distance iconDistance from the primary: 175 AU

Basic characteristic

icon weight
Mass: 48 % M Sun
| 503 M Jupiter
+
Star mass
Mass of the star 39 Leonis B is 0.98 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
| 9.2 R Jupiter
(estimate)
+
Star size
Radius of the star 39 Leonis B 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 icon
Temperature: 3740 K | 0.65 T Sun
+
Star temperature
Surface temperature of 39 Leonis B is 3740 K, which is 65 % 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

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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39 Leonis system structure

 39 Leonis A
39 Leonis B 175 AU

More about 39 Leonis

       39 Leonis 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
39 Leo, BD+23 2207, GJ 387, Gliese 387, HD 89125, HIP 50384, HR 4039, SAO 81270, Gaia EDR3 725398123501434496
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External sources
simbad icon
Simbad database (* 39 Leo B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 725398127796012288)
Archive from the Gaia mission

Frequently Asked Questions

How far is the 39 Leonis system from the Sun?

The 39 Leonis system is 73 light years or 22.3 parsecs from the Sun.

What galaxy is the 39 Leonis star in?

The 39 Leonis is in the Milky Way galaxy just like the Sun.

How many stars are in the 39 Leonis system?

The 39 Leonis system contains 2 stars.

What type of star is the 39 Leonis?

The primary in the 39 Leonis system is a Yellow-White star star.

What temperature is star 39 Leonis?

The primary in the 39 Leonis system has a temperature of 6118 K. Find out more about the temperature of stars in Stellar guide
Closest stars

 MCC 124
 - 4.6 ly

G 54-26
 - 5.5 ly

40 Leonis
 1.4 M☉ 5.7 ly

UPM J0954+2025
 - 7.6 ly

LSPM J1004+2656
 - 8 ly
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