Ross 128 b
Orbiting Ross 128
Ross 128 b is an exoplanet orbiting the star Ross 128, discovered in 2017 using the Radial Velocity method.
Minimum Mass (M sin i)
1.40
Earth masses
Orbital Period
9.9
days
Distance
3.4
parsecs
Equilibrium Temp
301
K
Radius (Earth radii)
Unknown
Minimum Mass, M sin(i) (Earth masses)
1.40
Radial-velocity minimum
Equilibrium Temperature
301 K
Parameter source: Bonfils et al. 2018
Orbital Period
9.866+0.007−0.007days
Semi-Major Axis
0.0496+0.0017−0.0017au
M sin(i) (Earth masses)
1.40+0.21−0.21
M sin(i) (Jupiter masses)
0.0044+0.0007−0.0007
Eccentricity
0.1160+0.0970−0.0970
Radial Velocity Semi-Amplitude
1.39+0.18−0.18m/s
Distance from Earth
3.4 pc (~11 ly)
Spectral Type
M4
Temperature
3192 K
Mass (Solar)
0.17 M☉
Radius (Solar)
0.20 R☉
Luminosity
-2.44 log L☉
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
176.9376°, 0.7993°
Discovery Method
Radial Velocity
Discovery Year
2017
Source ID: Ross 128 b
Ross 128 b orbits Ross 128 and was reported in 2017 and was detected with the Radial Velocity method.
Published measurements list a minimum mass of 1.4 Earth masses (M sin i), an orbital period of 9.87 days, and an equilibrium temperature near 301 K.
Catalog data places the system at about 3.4 parsecs from Earth, a host star classified as M4, 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 Ross 128