Exoplanet · gas giant
HAT-P-17 c
HAT-P-17 c is a gas giant orbiting the star HAT-P-17. Its year lasts 5,580 Earth days. It was discovered in 2012 by the Radial Velocity method.
| Host star | HAT-P-17 |
|---|---|
| Distance | 301.3 light-years (92.4 pc) |
| Orbital period | 15.3 years |
| Orbital radius | 5.6 AU |
| Eccentricity | 0.390 |
| Radius | 13.1 R⊕ · 1.17 R♃ |
| Mass (minimum) | 1,080 M⊕ · 3.4 M♃ |
| Density | 2.64 g/cm³ |
| Equilibrium temperature | 100 K (-174 °C) |
| Stellar flux received | 0.0164 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2012 |
| Discovered by | W. M. Keck Observatory |
Habitable zone
Beyond the habitable zone: it receives only %1.6 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.083° across: 0.16 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 10.48. Visible from the whole Northern Hemisphere and south to latitude 60° S. North of latitude 60° N it never sets. It stands highest at midnight in August, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1725. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.3 million years.
Planets in the same system
- HAT-P-17 b 10.3-day orbit · 11.8 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.