Exoplanet · Neptune-like planet
HD 177565 b
HD 177565 b is a Neptune-like planet orbiting the star HD 177565. Its year lasts 44.5 Earth days. It was discovered in 2017 by the Radial Velocity method.
| Host star | HD 177565 |
|---|---|
| Distance | 55.2 light-years (16.9 pc) |
| Orbital period | 44.5 days |
| Orbital radius | 0.246 AU |
| Eccentricity | 0.059 |
| Radius | 4 R⊕ · 0.357 R♃ |
| Mass (minimum) | 15.1 M⊕ · 0.0475 M♃ |
| Density | 1.3 g/cm³ |
| Equilibrium temperature | 539 K (266 °C) |
| Stellar flux received | 14.6 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2017 |
| Discovered by | La Silla Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 14.6 times the light the Earth does, too hot to keep liquid water on its surface.
Its star in the sky
In the planet's sky its star is a disc 2.1° across: 3.9 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.15). Visible from the whole Southern Hemisphere and north to latitude 52° N. South of latitude 52° S it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1971. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 979 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.