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HAT-P-18
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Star HAT-P-18

HAT-P-18 is an orange dwarf star located approximately 527 light years from the Sun. It has a mass of 0.77 solar masses and a radius of 0.717 solar radii, with a surface temperature of 4870 Kelvin.
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Sun distance
527 light years
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HAT-P-18 A

Orange star
Spectral class: K2V

Location +

Ascension iconRight ascension: 17h 5m 23.133s
Declination iconDeclination: 33° 0' 44.352'' (northern hemisphere)
Parallax iconParallax: 6.186
Distance iconSun distance: 527.227 ly | 161.6 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: 77 % M Sun
| 807 M Jupiter
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Star mass
Mass of the star HAT-P-18 A is 0.77 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: 72 % R Sun
| 7.1 R Jupiter
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Star size
Radius of the star HAT-P-18 A is 0.717 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: 4870.0 K | 0.84 T Sun
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Star temperature
Surface temperature of HAT-P-18 A is 4870.0 K, which is 84 % 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): 12.8
Magnitude iconAbsolute magnitude (V): 6.7
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

HAT-P-18 B

White dwarf

Location +

Distance iconDistance from the primary: 427 AU

Basic characteristic

temperature iconTemperature: 5000 K
 (estimate)
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Star temperature
Surface temperature of HAT-P-18 B is estimated to be 4992 K, which is 87 % 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

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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HAT-P-18 system structure

 HAT-P-18 A
HAT-P-18 A b 0.06 AU 58.2 M⊕ 10.6 R⊕ 5.5 days
HAT-P-18 B 427 AU

More about HAT-P-18

       HAT-P-18 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
HAT-P-18 A, Gaia DR3 1334573817793362560
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External sources
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Frequently Asked Questions

How far is the HAT-P-18 system from the Sun?

The HAT-P-18 system is 527 light years or 161.6 parsecs from the Sun.

What galaxy is the HAT-P-18 star in?

The HAT-P-18 is in the Milky Way galaxy just like the Sun.

How many stars are in the HAT-P-18 system?

The HAT-P-18 system contains 2 stars.

What type of star is the HAT-P-18?

The primary in the HAT-P-18 system is a Orange star star.

What temperature is star HAT-P-18?

The primary in the HAT-P-18 system has a temperature of 4870.0 K. Find out more about the temperature of stars in Stellar guide
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