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Ross 439
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Star Ross 439

Binary star Ross 439 is located 57 light years away from the Sun. It consists of 2 red dwarf stars. For now, there are no known exoplanets in this star system.
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Sun distance
57 light years
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Ross 439

Red dwarf, High proper motion star
Spectral class: M2.5

Location +

Ascension iconRight ascension: 9h 28m 53.164s
Declination iconDeclination: -7° 22' 27.237'' (equatorial region)
Parallax iconParallax: 57.182
Distance iconSun distance: 57.038 ly | 17.5 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: 40 % M Sun
| 429.5 M Jupiter
 (estimate)
+
Star mass
The mass of the star Ross 439 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
| 4.3 R Jupiter
(estimate)
+
Star size
Radius of the star Ross 439 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: 3500 K
 (estimate)
+
Star temperature
Surface temperature of Ross 439 is estimated to be 3542 K, which is 61 % 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): 12.1
Magnitude iconAbsolute magnitude (V): 10.9
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

G 161-34

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

Basic characteristic

icon weight
Mass: 20 % M Sun
| 199 M Jupiter
 (estimate)
+
Star mass
The mass of the star G 161-34 is unknown. Based on its other characteristics, it is estimated to be about 20 % 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: 20 % R Sun
| 2.4 R Jupiter
(estimate)
+
Star size
Radius of the star G 161-34 is not known. Its estimated value based on other similar stars is about 20 % 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: 3200 K
 (estimate)
+
Star temperature
Surface temperature of G 161-34 is estimated to be 3221 K, which is 55 % 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): 15.1
Magnitude iconAbsolute magnitude (V): 13.9
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
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Ross 439 system structure

 Ross 439
G 161-34

More about Ross 439

       Ross 439 can be found in southern 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 5745027080665197696
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External sources
simbad icon
Simbad database (G 161-34)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 5745027011945719808)
Archive from the Gaia mission

Frequently Asked Questions

How far is the Ross 439 system from the Sun?

The Ross 439 system is 57 light years or 17.5 parsecs from the Sun.

What galaxy is the Ross 439 star in?

The Ross 439 is in the Milky Way galaxy just like the Sun.

How many stars are in the Ross 439 system?

The Ross 439 system contains 2 stars.

What type of star is the Ross 439?

The primary in the Ross 439 system is a Red dwarf star.

What temperature is the Ross 439?

The primary in the Ross 439 system has an effective temperature of K ( °C). Find out more about the temperature of stars in Stellar guide
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