Exoplanet · gas giant
Kepler-129 d
Kepler-129 d is a gas giant orbiting the star Kepler-129. Its year lasts 2,650 Earth days. It was discovered in 2021 by the Radial Velocity method.
| Host star | Kepler-129 |
|---|---|
| Distance | 1,333 light-years (408.8 pc) |
| Orbital period | 7.24 years |
| Orbital radius | 4 AU |
| Eccentricity | 0.150 |
| Radius | 12.6 R⊕ · 1.12 R♃ |
| Mass (minimum) | 2,640 M⊕ · 8.3 M♃ |
| Density | 7.25 g/cm³ |
| Equilibrium temperature | 179 K (-94 °C) |
| Stellar flux received | 0.182 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2021 |
| Discovered by | W. M. Keck Observatory |
Habitable zone
Beyond the habitable zone: it receives only %18 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.22° across: 0.41 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.91. Visible from the whole Northern Hemisphere and south to latitude 42° S. North of latitude 42° N 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 693. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 24 million years.
Planets in the same system
- Kepler-129 b 15.8-day orbit · 2.4 R⊕
- Kepler-129 c 82.2-day orbit · 2.52 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.