Kepler-315 c
Kepler-315 c is a Neptune-like planet orbiting Kepler-315 in the constellation Cygnus. It lies about 3,786 light-years from Earth and was discovered in 2014 using the transit method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
How Big Is Kepler-315 c?
Kepler-315 c has a radius of 4.15 times that of Earth.
Is Kepler-315 c in the Habitable Zone?
Kepler-315 c orbits within the optimistic habitable zone of Kepler-315 — the broader region where liquid water might be possible under favorable atmospheric conditions.
Habitable zone of Kepler-315: 0.782–1.842 AU (conservative: 0.991–1.746 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-315 c — one full orbit around Kepler-315 — lasts 265.5 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.791 AU — comparable to the inner Solar System.
How Was Kepler-315 c Discovered?
Kepler-315 c 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-315 c?
Kepler-315 c is 3,785.5 light-years (1,160.6 parsecs) from Earth. Light arriving here tonight left the planet about 3,786 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 66,624,800 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-315 c scores 0.54, ranking #208 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-315
Kepler-315
- Surface temperature
- 5,796 K (Sun: 5,772 K)
- Radius
- 1.04 R☉
The Kepler-315 Planetary System
Kepler-315 c is one of 2 known planets in the Kepler-315 system. Its siblings:
- Kepler-315 b (Sub Neptune)
Kepler-315 c — Complete Data
| Radius | 4.150 Earth radii (0.370 Jupiter radii) |
|---|---|
| Orbital period | 265.47 days |
| Orbital distance | 0.791 AU |
| Earth Similarity Index | 0.54 |
| Distance from Earth | 3,785.5 light-years (1,160.6 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-315 c
Is Kepler-315 c habitable?
Kepler-315 c orbits within the habitable zone of Kepler-315, the region where liquid water could exist on a planet's surface. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is Kepler-315 c?
Kepler-315 c is about 3,786 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 66,624,800 years to get there.
How big is Kepler-315 c compared to Earth?
Kepler-315 c has 4.15 times the radius of Earth.
How long is a year on Kepler-315 c?
One orbit around Kepler-315 takes 265.5 Earth days.
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