Kepler-198 d
Kepler-198 d is a super-Earth orbiting Kepler-198 in the constellation Lyra. It lies about 1,616 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-198 d?
Kepler-198 d has a radius of 1.53 times that of Earth.
Is Kepler-198 d in the Habitable Zone?
The position of Kepler-198 d relative to the habitable zone of Kepler-198 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-198: 0.664–1.575 AU (conservative: 0.842–1.493 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-198 d — one full orbit around Kepler-198 — lasts just 31.5 hours, shorter than Mercury's 88-day year.
How Was Kepler-198 d Discovered?
Kepler-198 d was discovered in 2016 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-198 d?
Kepler-198 d is 1,615.6 light-years (495.4 parsecs) from Earth. Light arriving here tonight left the planet about 1,616 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 28,434,560 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-198 d scores 0.28, ranking #2,305 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-198
Kepler-198
- Surface temperature
- 5,574 K (Sun: 5,772 K)
- Radius
- 0.94 R☉
The Kepler-198 Planetary System
Kepler-198 d is one of 3 known planets in the Kepler-198 system. Its siblings:
- Kepler-198 b (Mini Neptune)
- Kepler-198 c (Mini Neptune)
Kepler-198 d — Complete Data
| Radius | 1.530 Earth radii (0.136 Jupiter radii) |
|---|---|
| Orbital period | 1.31 days |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 1,615.6 light-years (495.4 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-05-06. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-198 d
Is Kepler-198 d habitable?
Kepler-198 d is not known to orbit within the habitable zone of Kepler-198, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-198 d?
Kepler-198 d is about 1,616 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 28,434,560 years to get there.
How big is Kepler-198 d compared to Earth?
Kepler-198 d has 1.53 times the radius of Earth.
How long is a year on Kepler-198 d?
One orbit around Kepler-198 takes 1.3 Earth days — short enough that 278 of its years would fit into one Earth year.
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