stars
exoplanets
news
Exoplanet HD 20781 b
Exoplanet HD 20781 b orbits star HD 20781 that lies 117 light years away from the Sun.
It weighs about 1.93 Earth masses and orbits its star much closer than Earth orbits Sun.
Sun distance
117 light years
117 light years
Loading may take a moment.
HD 20781 b
Exoplanet
Star: HD 20781
Distance from the star: 0.0529 AU
Orbit around star: 5.3135 days
+
Orbital period
Orbital period of exoplanet HD 20781 b around its star is 5.3135 days.
The orbital period of an exoplanet is the time it takes to complete one full orbit around its star, usually measured in days. Most of the exoplanets discovered so far have orbital periods of less than one year...
More about Orbital period in StellarGuide
Eccentricity: 0.1Basic characteristic
Mass: 1.93 M Earth
Exoplanet mass
Exoplanet HD 20781 b has 1.93 Earth masses, or 0.13 times the mass of Uranus.
The mass of an exoplanet is one of the most important characteristics for understanding what kind of world it is — whether it’s small and rocky like Earth or large and gaseous like Jupiter. Mass provides key information about the planet’s composition, gravity, and formation history...
More about Exoplanet mass in StellarGuide
Year of discovery: 2011 (radial velocity)Advertisement
HD 20781 system structure
Exoplanet HD 20781 b orbits star HD 20781, which has much lower mass than Sun. It is the only known exoplanet orbiting this star
|
|
HD 20781 | ||||||||
| HD 20781 b | 0.05 AU | 1.9 M⊕ | 5.3 days | ||||||
Comparison
When comparing to the Solar system planets, HD 20781 b has 13 % of mass of Uranus and it orbits its star closer than Mercury orbits the Sun.
| Mercury | Venus | Earth | Mars | Jupiter | Saturn | Uranus | Neptune | ||
|---|---|---|---|---|---|---|---|---|---|
|
Mass | 35.09 | 2.37 | 1.93 | 17.55 | 0.01 | 0.02 | 0.13 | 0.11 |
|
Distance | 0.14 | 0.07 | 0.05 | 0.03 | 0.01 | 0.01 | 0 | 0 |
Habitability
Habitable zone of the star: 0.74 - 1.1 AU
The planet is too hot to sustain liquid water.
The planet has mass comparable to Earth.