Finding Earth 2.0
HR 8799 · A5 V

HR 8799 b

Rank #4991 of the ranked catalogue · Discovered by Imaging in 2008

HZ 0%measured

0.068

Earth-2.0 index

0.100

Earth Similarity Index

0%

Habitable-zone probability

13.00 R⊕

Radius

Planet

Mass2000.000 M⊕measured
Bulk density5.000 g/cm³
Orbital period170000.0000 days
Semi-major axis68.00000 au
Eccentricity
Incident flux0.001 S⊕
Equilibrium temperature46.3 K
Maximum angular separation1648.72 masReflected-light contrast 6.34e-12 at Aᵍ = 0.30 and Lambertian quadrature.
Composite parameter sources5 · mixedThe archive may select different publications for different parameters; mixed-source is disclosed, not automatically penalised.
Default-solution coverage55%0% median composite-to-default difference over shared parameters.

Host star & system

HostHR 8799
Spectral typeA5 V
Effective temperature7205 K
Radius1.493 R☉
Mass1.500 M☉
Distance41.2 pc / 134.5 ly
DiscoveryImaging, 2008