Kepler-345 b
Kepler-345 b is a terrestrial planet orbiting Kepler-345 in the constellation Cygnus. It was discovered in 2014 using the transit method.
How Big Is Kepler-345 b?
Kepler-345 b has a radius of 0.74 times that of Earth.
Is Kepler-345 b in the Habitable Zone?
Kepler-345 b orbits inside the inner edge of the habitable zone of Kepler-345. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-345: 0.303–0.748 AU (conservative: 0.383–0.709 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-345 b — one full orbit around Kepler-345 — lasts 7.42 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.066 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-345 b Discovered?
Kepler-345 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.
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-345 b scores 0.30, ranking #1,269 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-345
Kepler-345
- Surface temperature
- 4,504 K (Sun: 5,772 K)
- Radius
- 0.62 R☉
The Kepler-345 Planetary System
Kepler-345 b is one of 2 known planets in the Kepler-345 system. Its siblings:
- Kepler-345 c (Terrestrial)
Kepler-345 b — Complete Data
| Radius | 0.740 Earth radii (0.066 Jupiter radii) |
|---|---|
| Orbital period | 7.42 days |
| Orbital distance | 0.066 AU |
| Earth Similarity Index | 0.30 |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-345 b
Is Kepler-345 b habitable?
No — Kepler-345 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How big is Kepler-345 b compared to Earth?
Kepler-345 b has 0.74 times the radius of Earth.
How long is a year on Kepler-345 b?
One orbit around Kepler-345 takes 7.4 Earth days — short enough that 49 of its years would fit into one Earth year.
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