KOI-134 c
KOI-134 c is a cold gas giant orbiting the F9V star KOI-134 in the constellation Cygnus. It lies about 3,781 light-years from Earth and was discovered in 2025 using the transit timing variations method.
Is KOI-134 c in the Habitable Zone?
KOI-134 c orbits inside the inner edge of the habitable zone of KOI-134. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of KOI-134: 1.503–3.509 AU (conservative: 1.903–3.327 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 KOI-134 c — one full orbit around KOI-134 — lasts 34.0 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.231 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.24).
How Was KOI-134 c Discovered?
KOI-134 c was discovered in 2025 using the transit timing variations method, with observations from Kepler.
Transit timing variations reveal a planet through its gravitational tug on a sibling planet, which makes that sibling's transits arrive slightly early or late. The pattern of these deviations betrays the hidden planet's mass and orbit.
How Far Away Is KOI-134 c?
KOI-134 c is 3,780.8 light-years (1,159.2 parsecs) from Earth. Light arriving here tonight left the planet about 3,781 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 66,542,080 years to make the journey.
The Host Star: KOI-134
KOI-134
- Spectral type
- F9V
- Surface temperature
- 6,160 K (Sun: 5,772 K)
- Mass
- 1.41 M☉
- Radius
- 1.67 R☉
- Luminosity
- 4.2000 L☉
The KOI-134 Planetary System
KOI-134 c is one of 2 known planets in the KOI-134 system. Its siblings:
- KOI-134 b (Cold Gas Giant)
KOI-134 c — Complete Data
| Mass | 69.92 Earth masses (0.220 Jupiter masses) |
|---|---|
| Orbital period | 33.95 days |
| Orbital distance | 0.231 AU |
| Eccentricity | 0.240 |
| Distance from Earth | 3,780.8 light-years (1,159.2 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit Timing Variations |
| Discovery facility | Kepler |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-07-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KOI-134 c
Is KOI-134 c habitable?
No — KOI-134 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is KOI-134 c?
KOI-134 c is about 3,781 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 66,542,080 years to get there.
How long is a year on KOI-134 c?
One orbit around KOI-134 takes 34.0 Earth days — short enough that 11 of its years would fit into one Earth year.
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