HD 191939 b
Orbiting HD 191939
HD 191939 b is an exoplanet orbiting the star HD 191939, discovered in 2020 using the Transit method. It is a Mini-Neptune world.
Radius
3.41
Earth radii
Mass
10.00
Earth masses
Orbital Period
8.9
days
Distance
53.6
parsecs
Equilibrium Temp
880
K
Radius (Earth radii)
3.41
Mass (Earth masses)
10.00
Measured
Equilibrium Temperature
880 K
Parameter source: Orell-Miquel et al. 2023
Orbital Period
8.880+0.000−0.000days
Semi-Major Axis
0.0804+0.0025−0.0023au
Planet Mass (Earth masses)
10.00+0.70−0.70
Planet Mass (Jupiter masses)
0.0315+0.0022−0.0022
Eccentricity
0.0310+0.0100−0.0110
Argument of Periastron
5.0+40.0−35.0deg
Radial Velocity Semi-Amplitude
3.56+0.21−0.24m/s
Distance from Earth
53.6 pc (~175 ly)
Spectral Type
G9 V
Temperature
5348 K
Mass (Solar)
0.81 M☉
Radius (Solar)
0.94 R☉
Luminosity
-0.19 log L☉
Planets in System
6
Stars in System
1
Coordinates (RA, Dec)
302.0256°, 66.8503°
Discovery Method
Transit
Discovery Year
2020
Source ID: HD 191939 b
HD 191939 b orbits HD 191939 and was reported in 2020 and was detected with the Transit method.
Published measurements list a radius of 3.41 Earth radii, a mass of 10 Earth masses, an orbital period of 8.88 days, and an equilibrium temperature near 880 K.
Catalog data places the system at about 53.6 parsecs from Earth, a host star classified as G9 V, and 6 known planets in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open HD 191939More planets in this system