HD 209458 b
Orbiting HD 209458
HD 209458 b is an exoplanet orbiting the star HD 209458, discovered in 1999 using the Radial Velocity method. It is a Jupiter-sized world.
Radius
15.58
Earth radii
Mass
232.02
Earth masses
Orbital Period
3.5
days
Distance
48.3
parsecs
Radius (Earth radii)
15.58
Mass (Earth masses)
232.02
Measured
Equilibrium Temperature
Unknown
Parameter source: Stassun et al. 2017
Orbital Period
3.525+0.000−0.000days
Planet Mass (Earth masses)
232.02+12.71−12.71
Planet Mass (Jupiter masses)
0.7300+0.0400−0.0400
Eccentricity
0.0000
Radial Velocity Semi-Amplitude
84.70+0.70−0.70m/s
Distance from Earth
48.3 pc (~158 ly)
Spectral Type
Unknown
Temperature
6091 K
Mass (Solar)
1.23 M☉
Radius (Solar)
1.19 R☉
Luminosity
Unknown
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
330.7950°, 18.8842°
Discovery Method
Radial Velocity
Discovery Year
1999
Source ID: HD 209458 b
HD 209458 b orbits HD 209458 and was reported in 1999 and was detected with the Radial Velocity method.
Published measurements list a radius of 15.58 Earth radii, a mass of 232.02 Earth masses, and an orbital period of 3.52 days.
Catalog data places the system at about 48.3 parsecs from Earth 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 HD 209458