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WASP 121
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Star WASP 121

Yellow-White star WASP 121 is located 858 light years away from the Sun. It is a single star of spectral class F6V C, that has 135 % of solar mass. There is at least one exoplanet in this system.
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Sun distance
858 light years
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WASP 121

Yellow-White star
Spectral class: F6V C

Location +

Ascension iconRight ascension: 7h 10m 24.064s
Declination iconDeclination: -39° 5' 50.571'' (southern hemisphere)
Parallax iconParallax: 3.800
Distance iconSun distance: 858.396 ly | 263.2 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: 135.2 % M Sun
| 1416 M Jupiter
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Star mass
Mass of the star WASP 121 is 1.3521 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: 146 % R Sun
| 14.5 R Jupiter
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Star size
Radius of the star WASP 121 is 1.4572 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: 6460 K | 1.12 T Sun
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Star temperature
Surface temperature of WASP 121 is 6460 K, which is 112 % 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 iconApparent magnitude (V): 10.4
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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WASP 121 system structure

 WASP 121
WASP 121 b 0.03 AU 356.1 M⊕ 19.8 R⊕ 1.3 days

More about WASP 121

Star WASP 121 is a main sequence star that fuses hydrogen atoms into helium. It is is approximately 46 % bigger than the Sun and temperature on its surface is around 6460 K (6187 °C), which is about 112 % of Sun's temperature.
       WASP 121 can be found in southern celestial hemisphere, you cannot see it with naked eye, but you can observe this star with basic telescope. The star is also observable from Northern America, Europe and Asia.
Other designations of this star
TYC 7630-352-1, Gaia 5565050251402363648, 2MASS J07102406-3905506, 1SWASP J071024.05-390550.5, CD-38 3220, TIC 22529346, TOI-495, Gaia EDR3 5565050255701441664
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External sources
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An Analysis of Spitzer Phase Curves for WASP-121b and WASP-77Ab
Scientific study, Accepted: 16. 03. 2025
tess icon
TESS database (TOI 495.01)
Archive from the TESS mission

Frequently Asked Questions

How far is the WASP 121 system from the Sun?

The WASP 121 system is 858 light years or 263.2 parsecs from the Sun.

What galaxy is the WASP 121 star in?

The WASP 121 is in the Milky Way galaxy just like the Sun.

How many stars are in the WASP 121 system?

The WASP 121 is a single star, there are no other known stars in the system.

What type of star is the WASP 121?

The star WASP 121 is a Yellow-White star star.

What temperature is star WASP 121?

The star WASP 121 has an effective temperature of 6460 K. Find out more about the temperature of stars in Stellar guide
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