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9 Pegasi
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Star 9 Pegasi

Yellow supergiant 9 Pegasi is located 927 light years away from the Sun. It is a single star of spectral class G5Ib, that has 710 % of solar mass. For now, there are no known exoplanets in this star system.
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Sun distance
927 light years
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9 Pegasi

Yellow supergiant
Spectral class: G5Ib

Location +

Ascension iconRight ascension: 21h 44m 30.696s
Declination iconDeclination: 17° 21' 0.057'' (equatorial region)
Parallax iconParallax: 3.520
Distance iconSun distance: 926.580 ly | 284.1 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: 710 % M Sun
| 7438 M Jupiter
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Star mass
Mass of the star 9 Pegasi is 7.1 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: 6100 % R Sun
| 607 R Jupiter
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Star size
Radius of the star 9 Pegasi is 61 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: 4910 K | 0.85 T Sun
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Star temperature
Surface temperature of 9 Pegasi is 4910 K, which is 85 % 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: 1950 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
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9 Pegasi system structure

 9 Pegasi

More about 9 Pegasi

Star 9 Pegasi is is much bigger than the Sun and temperature on its surface is around 4910 K (4637 °C), which is about 85 % of Sun's temperature.
       9 Pegasi can be found in northern celestial hemisphere.
Other designations of this star
9 Peg, HR 8313, BD+16°4582, HD 206859, SAO 107365, HIC 107348, HIP 107348
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Frequently Asked Questions

How far is the 9 Pegasi system from the Sun?

The 9 Pegasi system is 927 light years or 284.1 parsecs from the Sun.

What galaxy is the 9 Pegasi star in?

The 9 Pegasi is in the Milky Way galaxy just like the Sun.

How many stars are in the 9 Pegasi system?

The 9 Pegasi is a single star, there are no other known stars in the system.

What type of star is the 9 Pegasi?

The star 9 Pegasi is a Yellow supergiant star.

What temperature is star 9 Pegasi?

The star 9 Pegasi has an effective temperature of 4910 K. Find out more about the temperature of stars in Stellar guide
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