Kepler-275 d
Kepler-275 d is a sub-Neptune orbiting Kepler-275 in the constellation Cygnus. It lies about 6,635 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-275 d?
Kepler-275 d has a radius of 3.33 times that of Earth.
Is Kepler-275 d in the Habitable Zone?
Kepler-275 d orbits inside the inner edge of the habitable zone of Kepler-275. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-275: 1.154–2.695 AU (conservative: 1.462–2.555 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-275 d — one full orbit around Kepler-275 — lasts 35.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.224 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-275 d Discovered?
Kepler-275 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-275 d?
Kepler-275 d is 6,634.8 light-years (2,034.3 parsecs) from Earth. Light arriving here tonight left the planet about 6,635 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 116,772,480 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-275 d scores 0.22, ranking #3,668 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-275
Kepler-275
- Surface temperature
- 6,165 K (Sun: 5,772 K)
- Radius
- 1.38 R☉
The Kepler-275 Planetary System
Kepler-275 d is one of 3 known planets in the Kepler-275 system. Its siblings:
- Kepler-275 b (Mini Neptune)
- Kepler-275 c (Sub Neptune)
Kepler-275 d — Complete Data
| Radius | 3.330 Earth radii (0.297 Jupiter radii) |
|---|---|
| Orbital period | 35.68 days |
| Orbital distance | 0.224 AU |
| Earth Similarity Index | 0.22 |
| Distance from Earth | 6,634.8 light-years (2,034.3 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-275 d
Is Kepler-275 d habitable?
No — Kepler-275 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-275 d?
Kepler-275 d is about 6,635 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 116,772,480 years to get there.
How big is Kepler-275 d compared to Earth?
Kepler-275 d has 3.33 times the radius of Earth.
How long is a year on Kepler-275 d?
One orbit around Kepler-275 takes 35.7 Earth days — short enough that 10 of its years would fit into one Earth year.
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