TOI-521 · M3
TOI-521 b
Rank #914 of the ranked catalogue · Discovered by Transit in 2025
HZ 0%measured
0.107
Earth-2.0 index
0.341
Earth Similarity Index
0%
Habitable-zone probability
1.98 R⊕
Radius
Planet
Mass5.300 M⊕measured
Bulk density3.800 g/cm³
Orbital period1.5429 days
Semi-major axis0.01950 au
Eccentricity0.000
Incident flux66.000 S⊕
Equilibrium temperature724.5 K
Transit-time σ at 20303.8 minLinear propagation of published epoch and period errors; not a ranking input.
Maximum angular separation0.32 masReflected-light contrast 1.79e-6 at Aᵍ = 0.30 and Lambertian quadrature.
Composite parameter sources2 · mixedThe archive may select different publications for different parameters; mixed-source is disclosed, not automatically penalised.
Default-solution coverage100%0% median composite-to-default difference over shared parameters.
Host star & system
HostTOI-521
Spectral typeM3
Effective temperature3544 K
Radius0.421 R☉
Mass0.420 M☉
Distance60.9 pc / 198.8 ly
DiscoveryTransit, 2025