Exoplanet

HAT-P-18 b

Orbiting HAT-P-18

Overview

HAT-P-18 b is an exoplanet orbiting the star HAT-P-18, discovered in 2010 using the Transit method. It is a Jupiter-sized world.

Key Measurements

Radius

11.15

Earth radii

015 R⊕

Mass

62.61

Earth masses

0500 M⊕

Orbital Period

5.5

days

0.1d10,000d

Distance

161.4

parsecs

Nearby10,000 pc

Equilibrium Temp

852

K

150 K3,500 K

Radius (Earth radii)

11.15

Mass (Earth masses)

62.61

Measured

Equilibrium Temperature

852 K

Parameter source: Hartman et al. 2011

Orbital Period

5.508+0.000−0.000days

Semi-Major Axis

0.0559+0.0007−0.0007au

Planet Mass (Earth masses)

62.61+4.13−4.13

Planet Mass (Jupiter masses)

0.1970+0.0130−0.0130

Eccentricity

0.0840+0.0480−0.0480

Argument of Periastron

120.0+56.0−56.0deg

Radial Velocity Semi-Amplitude

27.10+1.60−1.60m/s

Distance from Earth

161.4 pc (~526 ly)

Spectral Type

K2

Temperature

4803 K

Mass (Solar)

0.77 M☉

Radius (Solar)

0.75 R☉

Luminosity

-0.57 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

256.3464°, 33.0123°

Discovery Method

Transit

Discovery Year

2010

Data Sources
NASA Exoplanet Archive

Source ID: HAT-P-18 b

System Context

HAT-P-18 b orbits HAT-P-18 and was reported in 2010 and was detected with the Transit method.

Published measurements list a radius of 11.15 Earth radii, a mass of 62.61 Earth masses, an orbital period of 5.51 days, and an equilibrium temperature near 852 K.

Catalog data places the system at about 161.4 parsecs from Earth, a host star classified as K2, and 1 known planet in the system.

Host star

Explore the stellar record for this system to compare temperature, spectral type, and known planets.

Open HAT-P-18