Kepler-90 i
Kepler-90 i is a super-Earth orbiting KOI-351 in the constellation Draco. It lies about 2,767 light-years from Earth and was discovered in 2017 using the transit method.
How Big Is Kepler-90 i?
Kepler-90 i has a radius of 1.32 times that of Earth.
Is Kepler-90 i in the Habitable Zone?
The position of Kepler-90 i relative to the habitable zone of KOI-351 cannot be precisely determined from the available orbital data.
Habitable zone of KOI-351: 1.034–2.422 AU (conservative: 1.310–2.297 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 ›
Temperature on Kepler-90 i
The equilibrium temperature of Kepler-90 i is about 709 K (436 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on Kepler-90 i — one full orbit around KOI-351 — lasts 14.4 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-90 i Discovered?
Kepler-90 i was discovered in 2017 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-90 i?
Kepler-90 i is 2,766.6 light-years (848.3 parsecs) from Earth. Light arriving here tonight left the planet about 2,767 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 48,692,160 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-90 i scores 0.30, ranking #1,454 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: KOI-351
KOI-351
- Surface temperature
- 6,015 K (Sun: 5,772 K)
- Mass
- 1.12 M☉
- Radius
- 1.29 R☉
The KOI-351 Planetary System
Kepler-90 i is one of 8 known planets in the KOI-351 system. Its siblings:
Kepler-90 i — Complete Data
| Radius | 1.320 Earth radii (0.118 Jupiter radii) |
|---|---|
| Orbital period | 14.45 days |
| Equilibrium temperature | 709 K (436 °C) |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 2,766.6 light-years (848.3 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2017-12-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-90 i
Is Kepler-90 i habitable?
Kepler-90 i is not known to orbit within the habitable zone of KOI-351, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-90 i?
Kepler-90 i is about 2,767 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 48,692,160 years to get there.
How big is Kepler-90 i compared to Earth?
Kepler-90 i has 1.32 times the radius of Earth.
How long is a year on Kepler-90 i?
One orbit around KOI-351 takes 14.4 Earth days — short enough that 25 of its years would fit into one Earth year.
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