Kepler-430 b
Kepler-430 b is a sub-Neptune orbiting Kepler-430 in the constellation Cygnus. It lies about 2,992 light-years from Earth and was discovered in 2015 using the transit method.
How Big Is Kepler-430 b?
Kepler-430 b has a radius of 3.25 times that of Earth.
Is Kepler-430 b in the Habitable Zone?
Kepler-430 b orbits inside the inner edge of the habitable zone of Kepler-430. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-430: 1.148–2.698 AU (conservative: 1.454–2.558 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-430 b
The equilibrium temperature of Kepler-430 b is about 667 K (394 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on Kepler-430 b — one full orbit around Kepler-430 — lasts 36.0 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.224 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-430 b Discovered?
Kepler-430 b was discovered in 2015 using the transit method, with observations from Kepler.
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is Kepler-430 b?
Kepler-430 b is 2,992.4 light-years (917.5 parsecs) from Earth. Light arriving here tonight left the planet about 2,992 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 52,666,240 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. Kepler-430 b scores 0.23, ranking #3,516 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-430
Kepler-430
- Surface temperature
- 5,884 K (Sun: 5,772 K)
- Mass
- 1.17 M☉
- Radius
- 1.49 R☉
The Kepler-430 Planetary System
Kepler-430 b is one of 2 known planets in the Kepler-430 system. Its siblings:
- Kepler-430 c (Super Earth)
Kepler-430 b — Complete Data
| Radius | 3.250 Earth radii (0.290 Jupiter radii) |
|---|---|
| Orbital period | 35.97 days |
| Orbital distance | 0.224 AU |
| Equilibrium temperature | 667 K (394 °C) |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 2,992.4 light-years (917.5 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2015 |
Data: NASA Exoplanet Archive, last updated 2014-11-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-430 b
Is Kepler-430 b habitable?
No — Kepler-430 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-430 b?
Kepler-430 b is about 2,992 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 52,666,240 years to get there.
How big is Kepler-430 b compared to Earth?
Kepler-430 b has 3.25 times the radius of Earth.
How long is a year on Kepler-430 b?
One orbit around Kepler-430 takes 36.0 Earth days — short enough that 10 of its years would fit into one Earth year.
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