HD 18438 b
Orbiting HD 18438
HD 18438 b is an exoplanet orbiting the star HD 18438, discovered in 2023 using the Radial Velocity method.
Minimum Mass (M sin i)
6674.40
Earth masses
Orbital Period
803.0
days
Distance
224.1
parsecs
Radius (Earth radii)
Unknown
Minimum Mass, M sin(i) (Earth masses)
6674.40
Radial-velocity minimum
Equilibrium Temperature
Unknown
Parameter source: Lee et al. 2023
Orbital Period
803.000+5.000−5.000days
Semi-Major Axis
2.1000+0.1000−0.1000au
M sin(i) (Earth masses)
6674.40+317.83−317.83
M sin(i) (Jupiter masses)
21.0000+1.0000−1.0000
Eccentricity
0.1000+0.1000−0.1000
Epoch of Periastron
2455367.00+45.00−45.00days(JD)
Argument of Periastron
167.0+24.0−24.0deg
Radial Velocity Semi-Amplitude
305.00+18.00−18.00m/s
Distance from Earth
224.1 pc (~731 ly)
Spectral Type
M2.5 III
Temperature
3860 K
Mass (Solar)
1.84 M☉
Radius (Solar)
88.47 R☉
Luminosity
2.97 log L☉
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
46.5318°, 79.4186°
Discovery Method
Radial Velocity
Discovery Year
2023
Source ID: HD 18438 b
HD 18438 b orbits HD 18438 and was reported in 2023 and was detected with the Radial Velocity method.
Published measurements list a minimum mass of 6,674.4 Earth masses (M sin i) and an orbital period of 803 days.
Catalog data places the system at about 224.1 parsecs from Earth, a host star classified as M2.5 III, 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 18438