Gaia-4
Gaia-4 b
Discovered by Astrometry in 2025
unknownmeasured
—
Earth-2.0 index
—
Earth Similarity Index
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Habitable-zone probability
12.40 R⊕
Radius
Planet
Mass3750.375 M⊕measured
Bulk density10.800 g/cm³
Orbital period571.3000 days
Semi-major axis— au
Eccentricity0.338
Incident flux— S⊕
Equilibrium temperature— K
Maximum angular separation15.84 masReflected-light contrast 1.97e-8 at Aᵍ = 0.30 and Lambertian quadrature.
Composite parameter sources3 · mixedThe archive may select different publications for different parameters; mixed-source is disclosed, not automatically penalised.
Default-solution coverage78%0% median composite-to-default difference over shared parameters.
Host star & system
HostGaia-4
Spectral typeK
Effective temperature4034 K
Radius0.624 R☉
Mass0.644 M☉
Distance73.5 pc / 239.7 ly
DiscoveryAstrometry, 2025