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HD 49798
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Star HD 49798

Binary star HD 49798 is located 2718 light years away from the Sun. It consists of a hot subdwarf and a white dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
2718 light years
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HD 49798 A

Hot subdwarf
Spectral class: sdO6p

Location +

Ascension iconRight ascension: 6h 48m 4.700s
Declination iconDeclination: -44° 18' 58.438'' (southern hemisphere)
Parallax iconParallax: 1.200
Distance iconSun distance: 2,717.966 ly | 833.3 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: 150 % M Sun
| 1571 M Jupiter
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Star mass
Mass of the star HD 49798 A is 1.50 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: 145 % R Sun
| 14.4 R Jupiter
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Star size
Radius of the star HD 49798 A is 1.45 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: 47500 K | 8.22 T Sun
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Star temperature
Surface temperature of HD 49798 A is 47500 K, which is 822 % 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
luminosity icon
Luminosity: 3943 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 iconAbsolute magnitude (V): -9.6
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 49798 B

White dwarf
Spectral class: D

Basic characteristic

icon weight
Mass: 128 % M Sun
| 1341 M Jupiter
+
Star mass
Mass of the star HD 49798 B is 1.50 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: 0.2 % R Sun
| 0 R Jupiter
+
Star size
Radius of the star HD 49798 B is 0.0023 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: 225000 K | 38.94 T Sun
+
Star temperature
Surface temperature of HD 49798 B is 225000 K, which is 3894 % 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 49798 system structure

 HD 49798 A
HD 49798 B

More about HD 49798

       HD 49798 can be found in southern celestial hemisphere.
Other designations of this star
HD 49798, CD-44°2920, SAO 218207, HIP 32602, AAVSO 0645-44
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External sources
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Frequently Asked Questions

How far is the HD 49798 system from the Sun?

The HD 49798 system is 2718 light years or 833.3 parsecs from the Sun.

What galaxy is the HD 49798 star in?

The HD 49798 is in the Milky Way galaxy just like the Sun.

How many stars are in the HD 49798 system?

The HD 49798 system contains 2 stars.

What type of star is the HD 49798?

The primary in the HD 49798 system is a Hot subdwarf star.

What temperature is star HD 49798?

The primary in the HD 49798 system has a temperature of 47500 K. Find out more about the temperature of stars in Stellar guide
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