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G 259-20
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Star G 259-20

Binary star G 259-20 is located 72 light years away from the Sun. It consists of a brown dwarf and a red dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
72 light years
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G 259-20

Red dwarf, High proper motion star
Spectral class: M2.0Ve

Location +

Ascension iconRight ascension: 17h 43m 7.849s
Declination iconDeclination: 85° 26' 25.499'' (northern hemisphere)
Parallax iconParallax: 45.255
Distance iconSun distance: 72.070 ly | 22.1 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: 50 % M Sun
| 481.9 M Jupiter
 (estimate)
+
Star mass
The mass of the star G 259-20 is unknown. Based on its other characteristics, it is estimated to be about 50 % 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: 50 % R Sun
| 4.6 R Jupiter
(estimate)
+
Star size
Radius of the star G 259-20 is not known. Its estimated value based on other similar stars is about 50 % 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: 3600 K
 (estimate)
+
Star temperature
Surface temperature of G 259-20 is estimated to be 3622 K, which is 62 % 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

2MASS J17430860+8526594

Brown dwarf, , High proper motion star
Spectral class: L5

Basic characteristic

icon weight
Mass: 5 % M Sun
| 52.4 M Jupiter
 (estimate)
+
Star mass
The estimated mass of the star 2MASS J17430860+8526594 is about 5 % of the Sun's mass, or approximately 52.4 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 R Jupiter
(estimate)
+
Star size
Radius of the star 2MASS J17430860+8526594 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: 1600 K
 (estimate)
+
Star temperature
Surface temperature of 2MASS J17430860+8526594 is estimated to be 1605 K, which is 28 % 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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G 259-20 system structure

 G 259-20
2MASS J17430860+8526594

More about G 259-20

       G 259-20 can be found in northern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
Gaia EDR3 1724494760222303872
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External sources
simbad icon
Simbad database (2MASS J17430860+8526594)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 1724495516135399936)
Archive from the Gaia mission

Frequently Asked Questions

How far is the G 259-20 system from the Sun?

The G 259-20 system is 72 light years or 22.1 parsecs from the Sun.

What galaxy is the G 259-20 star in?

The G 259-20 is in the Milky Way galaxy just like the Sun.

How many stars are in the G 259-20 system?

The G 259-20 system contains 2 stars.

What type of star is the G 259-20?

The primary in the G 259-20 system is a Red dwarf star.

What temperature is the G 259-20?

The primary in the G 259-20 system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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