Kepler-241 b
Kepler-241 b is a mini-Neptune orbiting Kepler-241 in the constellation Cygnus. It lies about 1,670 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-241 b?
Kepler-241 b has a radius of 2.33 times that of Earth.
Is Kepler-241 b in the Habitable Zone?
Kepler-241 b orbits inside the inner edge of the habitable zone of Kepler-241. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-241: 0.351–0.859 AU (conservative: 0.444–0.814 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-241 b — one full orbit around Kepler-241 — lasts 12.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.094 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-241 b Discovered?
Kepler-241 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-241 b?
Kepler-241 b is 1,669.9 light-years (512.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,670 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 29,390,240 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-241 b scores 0.28, ranking #2,121 of 5,565 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-241
Kepler-241
- Surface temperature
- 4,699 K (Sun: 5,772 K)
- Radius
- 0.67 R☉
The Kepler-241 Planetary System
Kepler-241 b is one of 2 known planets in the Kepler-241 system. Its siblings:
- Kepler-241 c (Mini Neptune)
Kepler-241 b — Complete Data
| Radius | 2.330 Earth radii (0.208 Jupiter radii) |
|---|---|
| Orbital period | 12.72 days |
| Orbital distance | 0.094 AU |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 1,669.9 light-years (512.0 parsecs) |
| 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-241 b
Is Kepler-241 b habitable?
No — Kepler-241 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-241 b?
Kepler-241 b is about 1,670 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 29,390,240 years to get there.
How big is Kepler-241 b compared to Earth?
Kepler-241 b has 2.33 times the radius of Earth.
How long is a year on Kepler-241 b?
One orbit around Kepler-241 takes 12.7 Earth days — short enough that 29 of its years would fit into one Earth year.
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