GJ 887 c
Orbiting GJ 887
GJ 887 c is an exoplanet orbiting the star GJ 887, discovered in 2020 using the Radial Velocity method.
Minimum Mass (M sin i)
6.50
Earth masses
Orbital Period
21.8
days
Distance
3.3
parsecs
Equilibrium Temp
320
K
What these measurements mean
These comparisons use the reported catalog values. They are interpretations and calculations, not additional observations.
- A year on this world
- A 365.25-day Earth year spans about 16.8 of these orbits. This comparison uses the reported orbital period. It does not measure the planet's rotation or the length of its day.
- What the mass can tell you
- M sin i is a lower bound on the true mass because the viewing angle affects the radial-velocity measurement. Do not treat it as an exact mass or use it to claim a measured density.
- Temperature has limits
- Equilibrium temperature describes a model of absorbed and emitted energy, not a measured surface temperature. Atmosphere and reflectivity affect the interpretation. This value alone cannot establish liquid water, a habitable surface, or life.
Radius (Earth radii)
Unknown
Minimum Mass, M sin(i) (Earth masses)
6.50
Radial-velocity minimum
Equilibrium Temperature
320 K
Parameter source: Hartogh et al. 2026
Orbital Period
21.784+0.004−0.004days
Semi-Major Axis
0.1210+0.0040−0.0050au
M sin(i) (Earth masses)
6.50+1.00−0.90
M sin(i) (Jupiter masses)
0.0205+0.0031−0.0028
Eccentricity
0.1700+0.0600−0.0600
Argument of Periastron
200.0+110.0−140.0deg
Radial Velocity Semi-Amplitude
2.54+0.27−0.27m/s
Distance from Earth
3.3 pc (~11 ly)
Spectral Type
M1 V
Temperature
3688 K
Mass (Solar)
0.49 M☉
Radius (Solar)
0.47 R☉
Luminosity
-1.43 log L☉
Planets in System
4
Stars in System
1
Coordinates (RA, Dec)
346.5028°, -35.8473°
Discovery Method
Radial Velocity
Discovery Year
2020
Source ID: GJ 887 c
GJ 887 c orbits GJ 887 and was reported in 2020 and was detected with the Radial Velocity method.
Published measurements list a minimum mass of 6.5 Earth masses (M sin i), an orbital period of 21.78 days, and an equilibrium temperature near 320 K.
Catalog data places the system at about 3.3 parsecs from Earth, a host star classified as M1 V, and 4 known planets in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open GJ 887