55 Cnc b
Orbiting 55 Cnc
55 Cnc b is an exoplanet orbiting the star 55 Cnc, discovered in 1996 using the Radial Velocity method.
Minimum Mass (M sin i)
276.00
Earth masses
Orbital Period
14.7
days
Distance
12.6
parsecs
Radius (Earth radii)
Unknown
Minimum Mass, M sin(i) (Earth masses)
276.00
Radial-velocity minimum
Equilibrium Temperature
Unknown
Parameter source: Moutou et al. 2026
Orbital Period
14.652+0.000−0.000days
Semi-Major Axis
0.1180+0.0020−0.0020au
M sin(i) (Earth masses)
276.00+9.00−9.00
M sin(i) (Jupiter masses)
0.8684+0.0283−0.0283
Eccentricity
0.0029+0.0027−0.0020
Argument of Periastron
23.0+56.0−57.0deg
Radial Velocity Semi-Amplitude
71.50+0.22−0.22m/s
Distance from Earth
12.6 pc (~41 ly)
Spectral Type
G8 V
Temperature
5198 K
Mass (Solar)
1.01 M☉
Radius (Solar)
0.98 R☉
Luminosity
Unknown
Planets in System
7
Stars in System
2
Coordinates (RA, Dec)
133.1468°, 28.3298°
Discovery Method
Radial Velocity
Discovery Year
1996
Source ID: 55 Cnc b
55 Cnc b orbits 55 Cnc and was reported in 1996 and was detected with the Radial Velocity method.
Published measurements list a minimum mass of 276 Earth masses (M sin i) and an orbital period of 14.65 days.
Catalog data places the system at about 12.6 parsecs from Earth, a host star classified as G8 V, and 7 known planets in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open 55 Cnc