Exoplanet · Neptune-like planet
HD 11964 c
HD 11964 c is a Neptune-like planet orbiting the star HD 11964. Its year lasts 37.9 Earth days. It was discovered in 2008 by the Radial Velocity method.
| Host star | HD 11964 |
|---|---|
| Distance | 109.4 light-years (33.5 pc) |
| Orbital period | 37.9 days |
| Orbital radius | 0.229 AU |
| Eccentricity | 0.300 |
| Radius | 5.38 R⊕ · 0.48 R♃ |
| Mass (minimum) | 25 M⊕ · 0.0787 M♃ |
| Density | 0.882 g/cm³ |
| Equilibrium temperature | 758 K (484 °C) |
| Stellar flux received | 54.9 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2008 |
| Discovered by | W. M. Keck Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 54.9 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 4.7° across: 8.8 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.42). Visible from the whole Southern Hemisphere and north to latitude 80° N. South of latitude 80° S it never sets. It stands highest at midnight in October, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1917. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.9 million years.
Planets in the same system
- HD 11964 b 1,950-day orbit · 14.1 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.