Back to Catalog
2021
Discovered
43.9
Earth Masses
7.16
Earth Radii
1027
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,021
Discovery FacilityTransiting Exoplanet Survey Satellite (TESS)
Orbital Properties
Orbital Period18.3882 days
Semi-Major Axis0.1528 AU
Eccentricity0
Inclination87.91 deg
Physical Properties
Mass (Jupiter)0.138 MJ
Mass (Earth)43.8603 M⊕
Radius (Jupiter)0.639 RJ
Radius (Earth)7.1625 R⊕
Density0.65 g/cm3
Eq. Temperature1,027 K
Insolation Flux186 S⊕
Planetary Extremes
Where TOI-257 b sits on the spectrum of all known exoplanets.
Mass43.9 M⊕
FeatherweightColossus
Radius7.16 R⊕
TinyEnormous
Temperature1027 K
FrozenInferno
Year Length18.4 days
LightningGlacial
Density0.65 g/cm³
FluffyIron-dense
Star Distance0.153 AU
ScorchedFrozen exile
Size Comparison
7.16x Earth's radius (0.64x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)TOI-257 b: 18.4 Earth days (0.153 AU)
Host Star: TOI-257
Effective Temperature6,095 K
Mass1.407 M☉
Radius1.867 R☉
Size vs Sun1.87x larger
Luminosity4.33 L☉
Luminosity vs Sun4.330x brighter
Metallicity [Fe/H]0.175
Distance (pc)76.9028 pc
Distance (ly)250.8 light-years
Star System View
Loading 3D view...
What If You Lived Here?
59.8 kg
Your weight (from 70 kg)
0.85g
Earth-like
Feels just like home — comfortably familiar.
18.4 Earth days
Year length
Unknown sunrise
Test Your Knowledge
Related Research
Loading papers...