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HD 4391
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Star HD 4391

Triple star system HD 4391 is located 49 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
49 light years
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HD 4391 A

Yellow star
Spectral class: G3V

Location +

Ascension iconRight ascension: 0h 45m 45.890s
Declination iconDeclination: -47° 33' 5.878'' (southern hemisphere)
Parallax iconParallax: 66.451
Distance iconSun distance: 49.082 ly | 15.0 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: 122 % M Sun
| 1278 M Jupiter
+
Star mass
Mass of the star HD 4391 A is 1.22 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: 150 % R Sun
| 14.8 R Jupiter
(estimate)
+
Star size
Radius of the star HD 4391 A is not known. Its estimated value based on other similar stars is about 150 % 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: 5955 K | 1.03 T Sun
+
Star temperature
Surface temperature of HD 4391 A is 5955 K, which is 103 % 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: 1.2 billions years | 0.26 Sun
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Star age
Star HD 4391 A is 1.2 billion years old, which is about 0.26 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): 5.8
Magnitude iconAbsolute magnitude (V): 4.9
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

HD 4391 B

Red dwarf
Spectral class: M4V

Basic characteristic

icon weight
Mass: 30 % M Sun
| 272.4 M Jupiter
 (estimate)
+
Star mass
The mass of the star HD 4391 B is unknown. Based on its other characteristics, it is estimated to be about 30 % 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: 30 % R Sun
| 2.9 R Jupiter
(estimate)
+
Star size
Radius of the star HD 4391 B is not known. Its estimated value based on other similar stars is about 30 % 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: 3300 K
 (estimate)
+
Star temperature
Surface temperature of HD 4391 B is estimated to be 3300 K, which is 57 % 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

HD 4391 C

Red dwarf
Spectral class: M5V

Basic characteristic

icon weight
Mass: 20 % M Sun
| 188.6 M Jupiter
 (estimate)
+
Star mass
The mass of the star HD 4391 C 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
| 2.2 R Jupiter
(estimate)
+
Star size
Radius of the star HD 4391 C 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 HD 4391 C is estimated to be 3207 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

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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HD 4391 system structure

 HD 4391 A
HD 4391 B
HD 4391 C

More about HD 4391

       HD 4391 can be found in southern celestial hemisphere, and it is possible to see it with naked eye. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
CD-48 176, HD 4391, Gliese 1021, GJ 1021, HIP 3583, HR 209, SAO 215232, Gaia EDR3 4975284381908412672
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External sources
gaia icon
Gaia database (Gaia EDR3 4975284381907834752)
Archive from the Gaia mission

Frequently Asked Questions

How far is the HD 4391 system from the Sun?

The HD 4391 system is 49 light years or 15.0 parsecs from the Sun.

What galaxy is the HD 4391 star in?

The HD 4391 is in the Milky Way galaxy just like the Sun.

How many stars are in the HD 4391 system?

The HD 4391 system contains 3 stars.

What type of star is the HD 4391?

The primary in the HD 4391 system is a Yellow star star.

What temperature is star HD 4391?

The primary in the HD 4391 system has a temperature of 5955 K. Find out more about the temperature of stars in Stellar guide
Possible companions

 UCAC3 85-1637
 - 0.2 ly
Closest stars

 L 291-115
 - 2.1 ly

Gaia DR2 4975284381907834752
 - 4.4 ly

Nu Phoenicis
 1.2 M☉ 4.8 ly

DG Phoenix
 - 5.5 ly

HD 4378
 - 5.5 ly
3D map of stellar neighborhood
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