Kepler-219 d
Kepler-219 d is a mini-Neptune orbiting Kepler-219 in the constellation Cygnus. It lies about 2,567 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-219 d?
Kepler-219 d has a radius of 2.81 times that of Earth.
Is Kepler-219 d in the Habitable Zone?
Kepler-219 d orbits inside the inner edge of the habitable zone of Kepler-219. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-219: 1.122–2.642 AU (conservative: 1.421–2.505 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-219 d — one full orbit around Kepler-219 — lasts 47.9 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.272 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-219 d Discovered?
Kepler-219 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-219 d?
Kepler-219 d is 2,567.1 light-years (787.1 parsecs) from Earth. Light arriving here tonight left the planet about 2,567 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 45,180,960 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-219 d scores 0.27, ranking #2,547 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-219
Kepler-219
- Surface temperature
- 5,786 K (Sun: 5,772 K)
- Radius
- 1.49 R☉
The Kepler-219 Planetary System
Kepler-219 d is one of 3 known planets in the Kepler-219 system. Its siblings:
- Kepler-219 b (Mini Neptune)
- Kepler-219 c (Sub Neptune)
Kepler-219 d — Complete Data
| Radius | 2.810 Earth radii (0.251 Jupiter radii) |
|---|---|
| Orbital period | 47.90 days |
| Orbital distance | 0.272 AU |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 2,567.1 light-years (787.1 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-219 d
Is Kepler-219 d habitable?
No — Kepler-219 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-219 d?
Kepler-219 d is about 2,567 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 45,180,960 years to get there.
How big is Kepler-219 d compared to Earth?
Kepler-219 d has 2.81 times the radius of Earth.
How long is a year on Kepler-219 d?
One orbit around Kepler-219 takes 47.9 Earth days.
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