Exoplanet · Earth-sized rocky planet
Kepler-42 b
Kepler-42 b is a Earth-sized rocky planet orbiting the star Kepler-42. Its year lasts 1.21 Earth days. It was discovered in 2011 by the Transit method.
| Host star | Kepler-42 |
|---|---|
| Distance | 130.7 light-years (40.1 pc) |
| Orbital period | 29.1 hours |
| Orbital radius | 0.0116 AU |
| Eccentricity | 0.040 |
| Radius | 0.78 R⊕ · 0.0696 R♃ |
| Mass | 0.706 M⊕ · 0.00222 M♃ |
| Density | 0.15 g/cm³ |
| Surface gravity | 1.16 × Earth |
| Equilibrium temperature | 519 K (246 °C) |
| Stellar flux received | 22.4 × Earth |
| Discovery method | Transit |
| Discovery year | 2011 |
| Discovered by | Kepler |
Habitable zone
Inside the inner edge of the habitable zone: it receives 22.4 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 7.8° across: 15 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 16.21. Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° 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 1895. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.3 million years.
Planets in the same system
- Kepler-42 c 0.453-day orbit · 0.73 R⊕
- Kepler-42 d 1.87-day orbit · 0.57 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.