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HN Pegasi
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Star HN Pegasi

Binary star HN Pegasi is located 59 light years away from the Sun. It consists of a yellow star and a brown dwarf. For now, there are no known exoplanets in this star system.
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Sun distance
59 light years
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HN Pegasi A

Yellow star, BY Draconis variable
Spectral class: G0V+ C

Location +

Ascension iconRight ascension: 21h 44m 31.590s
Declination iconDeclination: 14° 46' 17.172'' (equatorial region)
Parallax iconParallax: 55.148
Distance iconSun distance: 59.142 ly | 18.1 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: 108.5 % M Sun
| 1137 M Jupiter
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Star mass
Mass of the star HN Pegasi A is 1.085 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
| 10 R Jupiter
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Star size
Radius of the star HN Pegasi A is 1.002 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: 5972 K | 1.03 T Sun
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Star temperature
Surface temperature of HN Pegasi A is 5972 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: 0.237 billions years | 0.05 Sun
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Star age
Star HN Pegasi A is 0.237 billion years old, which is about 0.05 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
luminosity icon
Luminosity: 1.09 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 iconApparent magnitude (V): 5.9
Magnitude iconAbsolute magnitude (V): 4.6
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

HN Pegasi B

Brown dwarf, , BY Draconis variable
Spectral class: T2.5 C

Location +

Distance iconDistance from the primary: 795 AU

Basic characteristic

icon weight
Mass: 2.7 % M Sun
| 28 M Jupiter
+
Star mass
Mass of the star HN Pegasi B is 1.085 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: 10.1 % R Sun
| 1 R Jupiter
+
Star size
Radius of the star HN Pegasi B is 0.101 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: 1115 K | 0.19 T Sun
+
Star temperature
Surface temperature of HN Pegasi B is 1115 K, which is 19 % 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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HN Pegasi system structure

 HN Pegasi A
HN Pegasi B 795 AU

More about HN Pegasi

      a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface. HN Pegasi can be found in northern celestial hemisphere, and it is possible to see it with naked eye. The star is easily observable from Northern America, Europe and Asia. 

      HN Pegasi is a BY Draconis variable. Stars from this category exhibit periodic variations in their luminosity. The variability is caused by a rotation which shows and hides starspots on the surface.
Other designations of this star
HN Peg, BD+14°4668, FK5 3737, Gliese 836.7, GJ 836.7, HD 206860, HIC 107350, HIP 107350, HR 8314, SAO 107364, LUH 4A, GJ 9751, Gliese 9751, LSPM J2144+1446, 2MASS J21443131+1446190, TIC 301880196, TYC 1133-1258-1, WISEA J214431.49+144617.8, V* HN Peg, ROT 3163, Gaia EDR3 1772187382746856320
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External sources
simbad icon
Simbad database (V* HN Peg B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

Frequently Asked Questions

How far is the HN Pegasi system from the Sun?

The HN Pegasi system is 59 light years or 18.1 parsecs from the Sun.

What galaxy is the HN Pegasi star in?

The HN Pegasi is in the Milky Way galaxy just like the Sun.

How many stars are in the HN Pegasi system?

The HN Pegasi system contains 2 stars.

What type of star is the HN Pegasi?

The primary in the HN Pegasi system is a Yellow star star.

What temperature is star HN Pegasi?

The primary in the HN Pegasi system has a temperature of 5972 K. Find out more about the temperature of stars in Stellar guide
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