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XO-3
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Star XO-3

Yellow-White star XO-3 is located 658 light years away from the Sun. It is a single star of spectral class F5V, that has 121 % of solar mass. There is at least one exoplanet in this system.
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Sun distance
658 light years
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XO-3

Yellow-White star
Spectral class: F5V

Location +

Ascension iconRight ascension: 4h 21m 52.705s
Declination iconDeclination: 57° 49' 1.868'' (northern hemisphere)
Parallax iconParallax: 4.960
Distance iconSun distance: 657.573 ly | 201.6 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: 121.3 % M Sun
| 1271 M Jupiter
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Star mass
Mass of the star XO-3 is 1.213 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: 138 % R Sun
| 13.7 R Jupiter
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Star size
Radius of the star XO-3 is 1.377 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: 6784 K | 1.17 T Sun
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Star temperature
Surface temperature of XO-3 is 6784 K, which is 117 % 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: 2.82 billions years | 0.61 Sun
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Star age
Star XO-3 is 2.82 billion years old, which is about 0.61 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: 2.92 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): 9.9
Magnitude iconAbsolute magnitude (V): 3.3
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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XO-3 system structure

 XO-3
XO-3 b 0.05 AU 3748.1 M⊕ 14.5 R⊕ 3.2 days

More about XO-3

Star XO-3 is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 38 % bigger than the Sun and temperature on its surface is around 6784 K (6511 °C), which is about 117 % of Sun's temperature.
       XO-3 can be found in northern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is easily observable from Northern America, Europe and Asia.
Other designations of this star
TYC 3727-1064-1, GSC 03727-01064, 2MASS J04215269+5749018
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External sources
icon study
The NUV transit of XO-3 b
Scientific study, Accepted: 06. 05. 2026
icon study
icon study
tess icon
TESS database (TOI 1676.01)
Archive from the TESS mission

Frequently Asked Questions

How far is the XO-3 system from the Sun?

The XO-3 system is 658 light years or 201.6 parsecs from the Sun.

What galaxy is the XO-3 star in?

The XO-3 is in the Milky Way galaxy just like the Sun.

How many stars are in the XO-3 system?

The XO-3 is a single star, there are no other known stars in the system.

What type of star is the XO-3?

The star XO-3 is a Yellow-White star star.

What temperature is star XO-3?

The star XO-3 has an effective temperature of 6784 K. Find out more about the temperature of stars in Stellar guide
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