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HD 39855
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Star HD 39855

Binary star HD 39855 is located 76 light years away from the Sun. It consists of a yellow star and a red dwarf. There is at least one exoplanet in this system.
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Sun distance
76 light years
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HD 39855 A

Yellow star, High proper motion star
Spectral class: G8VFe-0.7 C

Location +

Ascension iconRight ascension: 5h 54m 30.266s
Declination iconDeclination: -19° 42' 16.022'' (equatorial region)
Parallax iconParallax: 42.976
Distance iconSun distance: 75.893 ly | 23.3 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: 87 % M Sun
| 911 M Jupiter
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Star mass
Mass of the star HD 39855 A is 0.87 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: 100 % R Sun
| 9.7 R Jupiter
(estimate)
+
Star size
Radius of the star HD 39855 A is not known. Its estimated value based on other similar stars is about 100 % 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: 5576 K | 0.97 T Sun
+
Star temperature
Surface temperature of HD 39855 A is 5576 K, which is 97 % 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): 7.5
Magnitude iconAbsolute magnitude (V): 5.6
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 39855 B

Red dwarf, High proper motion star

Basic characteristic

icon weight
Mass: 60 % M Sun
| 607.6 M Jupiter
 (estimate)
+
Star mass
The mass of the star HD 39855 B is unknown. Based on its other characteristics, it is estimated to be about 60 % 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: 60 % R Sun
| 5.8 R Jupiter
(estimate)
+
Star size
Radius of the star HD 39855 B is not known. Its estimated value based on other similar stars is about 60 % 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: 3900 K
 (estimate)
+
Star temperature
Surface temperature of HD 39855 B is estimated to be 3909 K, which is 67 % 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): 10.4
Magnitude iconAbsolute magnitude (V): 8.6
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 39855 system structure

 HD 39855 A
HD 39855 A b 0.04 AU 8.5 M⊕ 3.2 days
HD 39855 B

More about HD 39855

       HD 39855 can be found in southern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
TYC 5939-2260-1, ** GAN 2A, ADS 4503 A, BD-19 1297, GSC 05939-02257, HIC 27922, HIP 27922, 2MASS J05543015-1942156, TIC 160301040, TYC 5939-2257-1, WDS J05545-1942A, Gaia EDR3 2966316109264052096
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External sources
simbad icon
Simbad database (TYC 5939-2260-1)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2966316109264051072)
Archive from the Gaia mission

Frequently Asked Questions

How far is the HD 39855 system from the Sun?

The HD 39855 system is 76 light years or 23.3 parsecs from the Sun.

What galaxy is the HD 39855 star in?

The HD 39855 is in the Milky Way galaxy just like the Sun.

How many stars are in the HD 39855 system?

The HD 39855 system contains 2 stars.

What type of star is the HD 39855?

The primary in the HD 39855 system is a Yellow star star.

What temperature is star HD 39855?

The primary in the HD 39855 system has a temperature of 5576 K. Find out more about the temperature of stars in Stellar guide
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