Kepler-65 d
Kepler-65 d is a super-Earth orbiting Kepler-65 in the constellation Lyra. It lies about 991 light-years from Earth and was discovered in 2012 using the transit method.
How Big Is Kepler-65 d?
Kepler-65 d has a radius of 1.52 times that of Earth.
Is Kepler-65 d in the Habitable Zone?
The position of Kepler-65 d relative to the habitable zone of Kepler-65 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on Kepler-65 d — one full orbit around Kepler-65 — lasts 8.13 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.084 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-65 d Discovered?
Kepler-65 d was discovered in 2012 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-65 d?
Kepler-65 d is 990.6 light-years (303.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1036. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 17,434,560 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-65 d scores 0.28, ranking #2,208 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-65
Kepler-65
- Mass
- 1.25 M☉
- Radius
- 1.44 R☉
The Kepler-65 Planetary System
Kepler-65 d is one of 4 known planets in the Kepler-65 system. Its siblings:
- Kepler-65 b (Super Earth)
- Kepler-65 c (Mini Neptune)
- Kepler-65 e (Cold Gas Giant)
Kepler-65 d — Complete Data
| Radius | 1.520 Earth radii (0.136 Jupiter radii) |
|---|---|
| Orbital period | 8.13 days |
| Orbital distance | 0.084 AU |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 990.6 light-years (303.7 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2012 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-65 d
Is Kepler-65 d habitable?
Kepler-65 d is not known to orbit within the habitable zone of Kepler-65, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-65 d?
Kepler-65 d is about 991 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 17,434,560 years to get there.
How big is Kepler-65 d compared to Earth?
Kepler-65 d has 1.52 times the radius of Earth.
How long is a year on Kepler-65 d?
One orbit around Kepler-65 takes 8.1 Earth days — short enough that 45 of its years would fit into one Earth year.
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