KOI-884 e
KOI-884 e is a cold gas giant orbiting Kepler-247 in the constellation Lyra. It lies about 2,165 light-years from Earth and was discovered in 2014 using the transit timing variations method.
Is KOI-884 e in the Habitable Zone?
The position of KOI-884 e relative to the habitable zone of Kepler-247 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-247: 0.466–1.123 AU (conservative: 0.591–1.065 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-884 e — one full orbit around Kepler-247 — lasts 31.1 Earth days, shorter than Mercury's 88-day year.
How Was KOI-884 e Discovered?
KOI-884 e was discovered in 2014 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-884 e?
KOI-884 e is 2,164.7 light-years (663.7 parsecs) from Earth. Light arriving here tonight left the planet about 2,165 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 38,098,720 years to make the journey.
The Host Star: Kepler-247
Kepler-247
- Surface temperature
- 5,100 K (Sun: 5,772 K)
- Radius
- 0.77 R☉
The Kepler-247 Planetary System
KOI-884 e is one of 4 known planets in the Kepler-247 system. Its siblings:
- Kepler-247 b (Super Earth)
- Kepler-247 c (Neptune-like)
- Kepler-247 d (Neptune-like)
KOI-884 e — Complete Data
| Mass | 66.05 Earth masses (0.208 Jupiter masses) |
|---|---|
| Orbital period | 31.10 days |
| Distance from Earth | 2,164.7 light-years (663.7 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit Timing Variations |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2026-09-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KOI-884 e
Is KOI-884 e habitable?
KOI-884 e is not known to orbit within the habitable zone of Kepler-247, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is KOI-884 e?
KOI-884 e is about 2,165 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 38,098,720 years to get there.
How long is a year on KOI-884 e?
One orbit around Kepler-247 takes 31.1 Earth days — short enough that 12 of its years would fit into one Earth year.
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