Finding Earth 2.0
GJ 667 C · M1.5 V

GJ 667 C f

Rank #9 of the ranked catalogue · Discovered by Radial Velocity in 2013

HZ 100%M sin i

0.702

Earth-2.0 index

rank #9

0.805

Earth Similarity Index

0.745–0.847 (68% CI)

100%

Conservative HZ probability

1.45 R⊕

Radius

mass: msini_lower_limit

At a glance

GJ 667 C lies 23.63 light-years (7.244 pc) from the Sun. GJ 667 C is a M1.5 V star with 0.33× the Sun's mass (effective temperature 3350 K, versus the Sun's 5772 K). It is one of 3 stars in this system hosting 5 known planets. GJ 667 C f is 1.45× Earth's radius, at least 2.7× Earth's mass (a radial-velocity minimum mass, not the true mass), completing one orbit every 39 days at 0.156 AU, on a mildly eccentric orbit (e = 0.03). It receives about 0.56× the flux Earth gets from the Sun, for an equilibrium temperature near 220 K (Earth's is 254 K).

Orbit and habitable-zone boundaries computed in Python from this system’s actual parameters. Sizes and the overall scale are compressed for visibility, not literal; green = conservative HZ, gold = optimistic HZ.

Planet parameters
Radius1.450 R⊕
Mass2.700 M⊕M sin iRadial-velocity minimum mass: the true mass is M/sin(i), so this is a LOWER limit.
Bulk density4.870 g/cm³source: catalogue
Escape velocity15.26 km/s
Orbital period39.0260 days
Semi-major axis0.15600 au
Eccentricity0.030
Incident flux0.563 S⊕source: catalogue
Equilibrium temperature220.2 KBond albedo assumed: 0.306. Equilibrium temperature excludes greenhouse warming by construction. Earth's is 254 K against a 288 K surface.
Host star
NameGJ 667 C
Spectral typeM1.5 V
Effective temperature3350 K
Radius— R☉
Mass0.330 M☉
Luminosity10^-1.863 L☉
Metallicity [Fe/H]-0.550
Age2.00 Gyr
Distance7.2 pc / 23.6 ly
Multiplicity3 star(s), 5 known planet(s)
Gaia DR3 cross-check
Parallax distance7.24 pc0.01% vs. archive-adopted distance
RUWE0.956
Habitable zone
Boundary modelKopparapu et al. (2013), ApJ 765, 131, with the 2013 erratum coefficients
BoundaryS_eff (Earth units)
recent venus1.5159
runaway greenhouse0.8706
moist greenhouse0.8659
maximum greenhouse0.2408
early mars0.2152
Atmospheric spectroscopy

No published transmission spectrum exists for this planet in the NASA Exoplanet Archive.

Transit analysis

Planet is not flagged as transiting; a light curve cannot show a transit.

Radial-velocity analysis
Measurements363baseline 19.2 yr across 5 instrument(s)
Activity coincidences11RV periodogram peaks matching a stellar-activity indicator period
Fitted semi-amplitude52.61 ± 0.09 m/sNOT RELIABLE: residual scatter 530.4 m/s exceeds five times the fitted amplitude 52.6 m/s
Measurement sources
ParameterValueSource
Planet radius1.4500archive-calculated (not a publication)
Planet mass2.7000Anglada-Escude et al. 2013
Orbital period39.0260Anglada-Escude et al. 2013
Semi-major axis0.1560Anglada-Escude et al. 2013
Incident flux0.5633archive-calculated (not a publication)
Bulk density4.8700archive-calculated (not a publication)
Orbital eccentricity0.0300Anglada-Escude et al. 2013
Stellar effective temperature3350.0000Anglada-Escude et al. 2013
Stellar mass0.3300Anglada-Escude et al. 2013
Stellar luminosity-1.8630Anglada-Escude et al. 2013
Stellar metallicity-0.5500Anglada-Escude et al. 2013
Stellar age2.0000Anglada-Escude et al. 2013
System distance7.2440TICv8

Component scores

Earth similarity

0.805

Conservative habitability

0.676

Observational confidence

0.618

Characterisation potential

—

Evidence

Independent references
1
Published parameter sets
1
Composite parameter sources
3 · mixed
Default-solution coverage
70%
Composite ↔ default difference
0% median
Uncertainty coverage
83%
Discovery method
Radial Velocity
Discovery year
2013

Flagged as controversial by the archive.

The archive composite selects values from multiple publications. This is disclosed separately and is not automatically penalised.

Observability

TSM
n/a (non-transiting)
RV semi-amplitude (expected)
1.066 m/s
Transit-time σ at 2030
—
Max angular separation
21.54 mas
Reflected-light contrast
1.50e-8

Follow-up lanes are diagnostics, not ranking inputs. Reflected light assumes Ag = 0.30 and Lambertian quadrature.

Identifiers

system_name
GJ 667

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Any rendering of this world is a scientifically informed visualisation, not an image. No exoplanet has been imaged at surface resolution. Surface and cloud appearance are illustrative of a physically plausible class, not observations.