51 Peg b
Orbiting 51 Peg
51 Peg b is an exoplanet orbiting the star 51 Peg, discovered in 1995 using the Radial Velocity method.
Mass
193.88
Earth masses
Orbital Period
4.2
days
Distance
15.5
parsecs
Radius (Earth radii)
Unknown
Mass (Earth masses)
193.88
Measured
Equilibrium Temperature
Unknown
Parameter source: Cont et al. 2026
Orbital Period
4.231+0.000−0.000days
Semi-Major Axis
0.0520au
Planet Mass (Earth masses)
193.88+19.07−15.89
Planet Mass (Jupiter masses)
0.6100+0.0600−0.0500
Eccentricity
<0.0063
Radial Velocity Semi-Amplitude
55.77+0.15−0.15m/s
Distance from Earth
15.5 pc (~50 ly)
Spectral Type
Unknown
Temperature
5761 K
Mass (Solar)
1.07 M☉
Radius (Solar)
1.19 R☉
Luminosity
Unknown
Planets in System
1
Stars in System
1
Coordinates (RA, Dec)
344.3675°, 20.7691°
Discovery Method
Radial Velocity
Discovery Year
1995
Source ID: 51 Peg b
51 Peg b orbits 51 Peg and was reported in 1995 and was detected with the Radial Velocity method.
Published measurements list a mass of 193.88 Earth masses and an orbital period of 4.23 days.
Catalog data places the system at about 15.5 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 51 Peg