Kepler-196 d
Kepler-196 d is a mini-Neptune orbiting Kepler-196 in the constellation Lyra. It lies about 1,472 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is Kepler-196 d?
Kepler-196 d has a radius of 2.66 times that of Earth.
Is Kepler-196 d in the Habitable Zone?
The position of Kepler-196 d relative to the habitable zone of Kepler-196 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-196: 0.473–1.137 AU (conservative: 0.599–1.078 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-196 d — one full orbit around Kepler-196 — lasts 122.1 Earth days, between the years of Mercury (88 days) and Earth (365 days).
How Was Kepler-196 d Discovered?
Kepler-196 d was discovered in 2021 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-196 d?
Kepler-196 d is 1,472.0 light-years (451.3 parsecs) from Earth. Light arriving here tonight left the planet about 1,472 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 25,907,200 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-196 d scores 0.60, ranking #132 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-196
Kepler-196
- Surface temperature
- 5,132 K (Sun: 5,772 K)
- Mass
- 0.81 M☉
- Radius
- 0.77 R☉
The Kepler-196 Planetary System
Kepler-196 d is one of 3 known planets in the Kepler-196 system. Its siblings:
- Kepler-196 b (Super Earth)
- Kepler-196 c (Mini Neptune)
Kepler-196 d — Complete Data
| Radius | 2.661 Earth radii (0.237 Jupiter radii) |
|---|---|
| Orbital period | 122.08 days |
| Earth Similarity Index | 0.60 |
| Distance from Earth | 1,472.0 light-years (451.3 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-12-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-196 d
Is Kepler-196 d habitable?
Kepler-196 d is not known to orbit within the habitable zone of Kepler-196, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-196 d?
Kepler-196 d is about 1,472 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 25,907,200 years to get there.
How big is Kepler-196 d compared to Earth?
Kepler-196 d has 2.66 times the radius of Earth.
How long is a year on Kepler-196 d?
One orbit around Kepler-196 takes 122.1 Earth days.
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