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Star EQ Pegasi B

Red dwarf EQ Pegasi B is located 20 light years away from the Sun. It is a single flare star of spectral class M4.0Ve, that has 17 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
20 light years

EQ Pegasi B

Red dwarf, flare star
Spectral class: M4.0Ve

Basic characteristic

icon weight
Mass: 17.1 % M Sun
| 179 M Jupiter
+
Star mass
Mass of the star EQ Pegasi B is 0.17052 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: 20 % R Sun
| 1.9 R Jupiter
(estimate)
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Star size
Radius of the star EQ Pegasi B 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 icon
Temperature: 2900 K | 0.5 T Sun
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Star temperature
Surface temperature of EQ Pegasi B is 2900 K, which is 50 % 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 iconAbsolute magnitude (V): 1
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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EQ Pegasi B system structure

EQ Pegasi A
EQ Pegasi A b 0.64 AU 718.5 M⊕ 284.4 days
EQ Pegasi B

More about EQ Pegasi B

EQ Pegasi B is approximately 20 % of the size of Sun and temperature on its surface is around 2900 K (2627 °C), which is about 50 % of Sun's temperature.
       EQ 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. 
Other designations of this star
BD+19 5116B, Gaia EDR3 2824770686019004032
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External sources
icon study
_empty
Scientific study, Accepted: 29. 12. 2026
icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
simbad icon
Simbad database (BD+19 5116B)
Astronomical database SIMBAD (the Set of Identifications, Measurements and Bibliography for Astronomical Data)
gaia icon
Gaia database (Gaia EDR3 2824770686019004032)
Archive from the Gaia mission

Frequently Asked Questions

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

The EQ Pegasi B system is 20 light years or 6.3 parsecs from the Sun.

What galaxy is the EQ Pegasi B star in?

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

How many stars are in the EQ Pegasi B system?

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

What type of star is the EQ Pegasi B?

The star EQ Pegasi B is a Red dwarf star.

What temperature is star EQ Pegasi B?

The star EQ Pegasi B has an effective temperature of 2900 K. Find out more about the temperature of stars in Stellar guide
Class of stars Red dwarf
Red dwarfs are small, cool stars with surface temperatures of about 2,000–3,800 K, much cooler than the Sun. They usually have 8–50% of the Sun’s mass and shine very faintly, sometimes at just a tiny fraction of the Sun’s brightness. Classified mainly as spectral type M, they are the most common stars in the Milky Way, making up roughly 70–75% of its stellar population.

They fuse hydrogen slowly through the proton–proton chain and are fully convective, which allows them to use their fuel very efficiently. As a result, red dwarfs can live for tens of billions to trillions of years—far longer than the Sun. Many exoplanets orbit red dwarfs, including some in close habitable zones, though strong stellar activity can affect planetary environments.
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