Kepler-305 b
Kepler-305 b is a puffy low-density planet orbiting Kepler-305 in the constellation Cygnus. It lies about 2,833 light-years from Earth and was discovered in 2013 using the transit method.
How Big Is Kepler-305 b?
Kepler-305 b has a radius of 3.60 times that of Earth. Its mass is 10.5 times that of Earth.
Is Kepler-305 b in the Habitable Zone?
The position of Kepler-305 b relative to the habitable zone of Kepler-305 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on Kepler-305 b — one full orbit around Kepler-305 — lasts 5.49 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-305 b Discovered?
Kepler-305 b was discovered in 2013 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-305 b?
Kepler-305 b is 2,832.6 light-years (868.5 parsecs) from Earth. Light arriving here tonight left the planet about 2,833 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 49,853,760 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-305 b scores 0.20, ranking #3,897 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-305
Kepler-305
- Mass
- 0.76 M☉
- Radius
- 0.80 R☉
The Kepler-305 Planetary System
Kepler-305 b is one of 4 known planets in the Kepler-305 system. Its siblings:
- Kepler-305 c (Puffy Planet)
- Kepler-305 d (Mini Neptune)
- Kepler-305 e (Super Earth)
Kepler-305 b — Complete Data
| Radius | 3.600 Earth radii (0.321 Jupiter radii) |
|---|---|
| Mass | 10.50 Earth masses (0.033 Jupiter masses) |
| Orbital period | 5.49 days |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 2,832.6 light-years (868.5 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2013 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-305 b
Is Kepler-305 b habitable?
Kepler-305 b is not known to orbit within the habitable zone of Kepler-305, and as a puffy low-density planet it is an unlikely candidate for life as we know it.
How far away is Kepler-305 b?
Kepler-305 b is about 2,833 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 49,853,760 years to get there.
How big is Kepler-305 b compared to Earth?
Kepler-305 b has 3.60 times the radius of Earth and about 10.5 times its mass.
How long is a year on Kepler-305 b?
One orbit around Kepler-305 takes 5.5 Earth days — short enough that 67 of its years would fit into one Earth year.
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