Kepler-424 b
Kepler-424 b is a hot Jupiter orbiting Kepler-424 in the constellation Cygnus. It lies about 2,279 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-424 b?
Kepler-424 b has a radius of 9.98 times that of Earth, or 0.89 times the radius of Jupiter. Its mass is 327 times that of Earth, giving it a density of 1.94 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is Kepler-424 b in the Habitable Zone?
Kepler-424 b orbits inside the inner edge of the habitable zone of Kepler-424. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-424: 0.643–1.530 AU (conservative: 0.815–1.450 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on Kepler-424 b — one full orbit around Kepler-424 — lasts 3.31 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.044 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-424 b Discovered?
Kepler-424 b was discovered in 2014 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-424 b?
Kepler-424 b is 2,278.7 light-years (698.6 parsecs) from Earth. Light arriving here tonight left the planet about 2,279 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 40,105,120 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-424 b scores 0.09, ranking #4,521 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-424
Kepler-424
- Surface temperature
- 5,460 K (Sun: 5,772 K)
- Mass
- 1.01 M☉
- Radius
- 0.94 R☉
- Luminosity
- 0.7079 L☉
The Kepler-424 Planetary System
Kepler-424 b is one of 2 known planets in the Kepler-424 system. Its siblings:
- Kepler-424 c (Cold Gas Giant)
Kepler-424 b — Complete Data
| Radius | 9.980 Earth radii (0.890 Jupiter radii) |
|---|---|
| Mass | 327.35 Earth masses (1.030 Jupiter masses) |
| Density | 1.94 g/cm³ (Earth: 5.51) |
| Orbital period | 3.31 days |
| Orbital distance | 0.044 AU |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 2,278.7 light-years (698.6 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2014-10-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-424 b
Is Kepler-424 b habitable?
No — Kepler-424 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-424 b?
Kepler-424 b is about 2,279 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 40,105,120 years to get there.
How big is Kepler-424 b compared to Earth?
Kepler-424 b has 9.98 times the radius of Earth and about 327 times its mass.
How long is a year on Kepler-424 b?
One orbit around Kepler-424 takes 3.3 Earth days — short enough that 110 of its years would fit into one Earth year.
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