do not follow here
Stellar Catalog more icon Nearby stars catalogue more icon
HN Pegasi B
more icon

Star HN Pegasi B

Brown dwarf HN Pegasi B is located 59 light years away from the Sun. It is a single star of spectral class T2.5 C, that has 3 % of solar mass. For now, there are no known exoplanets in this star system.
Loading 3D model
Nearby stars catalogue
Sun distance
59 light years
galaxy map

HN Pegasi B

Brown dwarf
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 0.027 solar masses (or 28.3 Jupiter 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
Advertisement

HN Pegasi B system structure

 HN Pegasi A
HN Pegasi B 795 AU

More about HN Pegasi B

HN Pegasi B is approximately 10 % of the size of Sun and temperature on its surface is around 1115 K (842 °C), which is about 19 % of Sun's temperature.
       HN Pegasi B can be found in northern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Advertisement
External sources
icon study
_empty
Scientific study, Accepted: 29. 12. 2026
icon study
A Sample of Thick-Disk Stars Hosting Hot Jupiters
Scientific study, Accepted: 16. 10. 2026
icon study
icon study
icon study
icon study
icon study
icon study
icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
icon study
simbad icon
Simbad database (V* HN Peg B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)

News from this star system

WASP-33 b and other hot Jupiters identified as prime targets for structural studies
iconYesterday
Image: WASP-33 b and other hot Jupiters identified as prime targets for structural studies
WASP-33 b, WASP-76 b, and HAT-P-32 b are identified as the best candidates for studying how stellar gravity shapes exoplanet interiors. Measuring their physical deformation will help reveal their deep, internal density structures using JWST and Ariel data....
Read article tag icon
Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
iconYesterday
Image: Atmospheric structure of WASP-94 A b revealed through new limb asymmetry method
A new analysis of WASP-94 A b reveals a 415 K temperature difference between its morning and evening sides. The evening atmosphere shows signs of H2O, CO2, CO, and H2S, while the morning side remains obscured by aerosols....
Read article tag icon
Thick-disk stars identified as hosts to ancient hot jupiter planets
iconYesterday
Image: Thick-disk stars identified as hosts to ancient hot jupiter planets
New analysis of 268 stars identifies several hot Jupiters orbiting ancient stars in the Milky Way's thick disk. These systems, over 8 billion years old, show distinct differences in mass and orbital periods compared to younger thin-disk populations....
Read article tag icon

Frequently Asked Questions

How far is the HN Pegasi B system from the Sun?

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

What galaxy is the HN Pegasi B star in?

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

How many stars are in the HN Pegasi B system?

The HN Pegasi B is a single star, there are no other known stars in the system.

What type of star is the HN Pegasi B?

The star HN Pegasi B is a Brown dwarf star.

What temperature is star HN Pegasi B?

The star HN Pegasi B has an effective temperature of 1115 K. Find out more about the temperature of stars in Stellar guide
Class of stars Brown dwarf
Brown dwarfs are not really stars, because there is no thermonuclear fusion in their core. These objects are smaller and cooler than stars, but too massive to be considered planets
Advertisement

exoplanet iconAbout Stellar Catalog

line
Working with real data
icon Data in Stellar Catalog come from trusted scientific sources. Primary source is Gaia space telescope mapping the stars in Milky Way. Other sources include research papers, Simbad catalog and Exoplanet.eu database.
Estimated values
icon Objects listed in the Stellar Catalog often have values that are estimates. These estimates are determined using their known characteristics, such as spectral type, brightness across different wavelengths, distance from a star, and other factors.
Fresh and validated
icon Stellar Catalog is continuously updated with new information from research papers. Stellar and planetary data are validated by automatic processes as well as humans.
Get your next news from nearby stars
Stellar Catalog brings the stars from our galaxy to you. Discover their position, physical properties and whether there are any exoplanets or disks orbiting them. The data in Stellar Catalog come from respectable sources like Gaia space telescope, or SIMBAD database.
Visit Stellar catalog on Facebook
Visit profile on X

Advertisement