HD 21520 b
Orbiting HD 21520
HD 21520 b is an exoplanet orbiting the star HD 21520, discovered in 2024 using the Transit method. It is a Mini-Neptune world.
Radius
2.70
Earth radii
Mass
17.70
Earth masses
Orbital Period
25.1
days
Distance
79.2
parsecs
Equilibrium Temp
637
K
Radius (Earth radii)
2.70
Mass (Earth masses)
17.70
Measured
Equilibrium Temperature
637 K
Parameter source: Nies et al. 2024
Orbital Period
25.129+0.000−0.000days
Semi-Major Axis
0.1726+0.0071−0.0071au
Planet Mass (Earth masses)
17.70
Planet Mass (Jupiter masses)
0.0557
Eccentricity
0.0000
Radial Velocity Semi-Amplitude
1.64+0.63−0.63m/s
Distance from Earth
79.2 pc (~258 ly)
Spectral Type
Unknown
Temperature
5871 K
Mass (Solar)
1.09 M☉
Radius (Solar)
1.04 R☉
Luminosity
0.07 log L☉
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
51.6403°, -43.6137°
Discovery Method
Transit
Discovery Year
2024
Source ID: HD 21520 b
HD 21520 b orbits HD 21520 and was reported in 2024 and was detected with the Transit method.
Published measurements list a radius of 2.7 Earth radii, a mass of 17.7 Earth masses, an orbital period of 25.13 days, and an equilibrium temperature near 637 K.
Catalog data places the system at about 79.2 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 21520