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WASP 17
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Star WASP 17

WASP-17 is a star located approximately 1,314 light-years from the Sun. It has a mass of 1.2 solar masses and a radius of 1.38 solar radii. With an estimated age of 3 billion years and a surface temperature of 6,650 Kelvin, this star serves as the host for the hot Jupiter exoplanet WASP-17 b.
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Sun distance
1315 light years
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WASP 17

Yellow-White star
Spectral class: F4

Location +

Ascension iconRight ascension: 15h 59m 50.947s
Declination iconDeclination: -28° 3' 42.464'' (southern hemisphere)
Parallax iconParallax: 2.481
Distance iconSun distance: 1,314.574 ly | 403.1 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: 120 % M Sun
| 1257 M Jupiter
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Star mass
Mass of the star WASP 17 is 1.2 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 WASP 17 is 1.38 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: 6650 K | 1.15 T Sun
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Star temperature
Surface temperature of WASP 17 is 6650 K, which is 115 % 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: 3 billions years | 0.65 Sun
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Star age
Star WASP 17 is 3 billion years old, which is about 0.65 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

Photometry

Magnitude iconApparent magnitude (V): 11.6
Magnitude iconAbsolute magnitude (V): 3.6
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 17 system structure

 WASP 17
WASP 17 b 0.05 AU 154.5 M⊕ 22.3 R⊕ 3.7 days

More about WASP 17

Star WASP 17 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 6650 K (6377 °C), which is about 115 % of Sun's temperature.
       WASP 17 can be found in southern celestial hemisphere, however it is too dim to be seen with the naked eye or even a small telescope.
Other designations of this star
Gaia DR3 6042793005779654656
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External sources
icon study
A Spatial Map of the Atmospheric Limb of a Hot Jupiter
Scientific study, Accepted: 14. 10. 2026
icon study
icon study
icon study
icon study
icon study
gaia icon
Gaia database (Gaia DR3 6042793005779654656)
Archive from the Gaia mission
tess icon
TESS database (TOI 1050.01)
Archive from the TESS mission

News from this star system

Atmospheric limb of WASP-17 b reveals significant temperature differences
iconYesterday
Image: Atmospheric limb of WASP-17 b reveals significant temperature differences
A new spatial map of the hot Jupiter WASP-17 b reveals a 650 K temperature difference between its morning and evening atmosphere. The study used transmission string mapping to confirm atmospheric chemical stability and global circulation patterns....
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Brown dwarf theory helps explain silicate clouds in giant exoplanet atmospheres
icon16. 3. 2026
Image: Brown dwarf theory helps explain silicate clouds in giant exoplanet atmospheres
Brown dwarf theory and meteorite evidence help explain why silicate clouds in giant exoplanet atmospheres match their host star’s chemistry, revealing new links between planet formation and cloud composition....
Read article tag icon
JWST observations and new models reveal how silicate clouds form in exoplanet atmospheres
icon16. 3. 2026
Image: JWST observations and new models reveal how silicate clouds form in exoplanet atmospheres
JWST and new models reveal that silicate clouds in exoplanet atmospheres form from tiny particles, with their properties shaped by how efficiently they stick and settle....
Read article tag icon

Frequently Asked Questions

How far is the WASP 17 system from the Sun?

The WASP 17 system is 1315 light years or 403.1 parsecs from the Sun.

What galaxy is the WASP 17 star in?

The WASP 17 is in the Milky Way galaxy just like the Sun.

How many stars are in the WASP 17 system?

The WASP 17 is a single star, there are no other known stars in the system.

What type of star is the WASP 17?

The star WASP 17 is a Yellow-White star star.

What temperature is star WASP 17?

The star WASP 17 has an effective temperature of 6650 K. Find out more about the temperature of stars in Stellar guide
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