Kepler-52 d
Kepler-52 d is a super-Earth orbiting Kepler-52 in the constellation Draco. It lies about 1,049 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-52 d?
Kepler-52 d has a radius of 1.95 times that of Earth.
Is Kepler-52 d in the Habitable Zone?
Kepler-52 d orbits inside the inner edge of the habitable zone of Kepler-52. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-52: 0.209–0.528 AU (conservative: 0.265–0.501 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-52 d — one full orbit around Kepler-52 — lasts 36.4 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.182 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-52 d Discovered?
Kepler-52 d 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-52 d?
Kepler-52 d is 1,048.7 light-years (321.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,049 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,457,120 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-52 d scores 0.58, ranking #159 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-52
Kepler-52
- Surface temperature
- 4,075 K (Sun: 5,772 K)
- Mass
- 0.54 M☉
- Radius
- 0.52 R☉
The Kepler-52 Planetary System
Kepler-52 d is one of 3 known planets in the Kepler-52 system. Its siblings:
- Kepler-52 b (Super Earth)
- Kepler-52 c (Super Earth)
Kepler-52 d — Complete Data
| Radius | 1.950 Earth radii (0.174 Jupiter radii) |
|---|---|
| Orbital period | 36.45 days |
| Orbital distance | 0.182 AU |
| Earth Similarity Index | 0.58 |
| Distance from Earth | 1,048.7 light-years (321.5 parsecs) |
| Constellation | Draco |
| 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-52 d
Is Kepler-52 d habitable?
No — Kepler-52 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-52 d?
Kepler-52 d is about 1,049 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,457,120 years to get there.
How big is Kepler-52 d compared to Earth?
Kepler-52 d has 1.95 times the radius of Earth.
How long is a year on Kepler-52 d?
One orbit around Kepler-52 takes 36.4 Earth days — short enough that 10 of its years would fit into one Earth year.
Explore Kepler-52 d in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
