Kepler-154 d
Kepler-154 d is a sub-Neptune orbiting Kepler-154 in the constellation Cygnus. It lies about 2,985 light-years from Earth and was discovered in 2016 using the transit method.
How Big Is Kepler-154 d?
Kepler-154 d has a radius of 3.84 times that of Earth.
Is Kepler-154 d in the Habitable Zone?
The position of Kepler-154 d relative to the habitable zone of Kepler-154 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-154: 0.732–1.730 AU (conservative: 0.928–1.640 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-154 d — one full orbit around Kepler-154 — lasts 20.5 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-154 d Discovered?
Kepler-154 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-154 d?
Kepler-154 d is 2,985.0 light-years (915.2 parsecs) from Earth. Light arriving here tonight left the planet about 2,985 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 52,536,000 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-154 d scores 0.20, ranking #3,858 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-154
Kepler-154
- Surface temperature
- 5,690 K (Sun: 5,772 K)
- Radius
- 1.00 R☉
The Kepler-154 Planetary System
Kepler-154 d is one of 5 known planets in the Kepler-154 system. Its siblings:
- Kepler-154 b (Mini Neptune)
- Kepler-154 c (Mini Neptune)
- Kepler-154 e (Super Earth)
- Kepler-154 f (Super Earth)
Kepler-154 d — Complete Data
| Radius | 3.840 Earth radii (0.343 Jupiter radii) |
|---|---|
| Orbital period | 20.55 days |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 2,985.0 light-years (915.2 parsecs) |
| Constellation | Cygnus |
| 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-154 d
Is Kepler-154 d habitable?
Kepler-154 d is not known to orbit within the habitable zone of Kepler-154, and as a sub-Neptune it is an unlikely candidate for life as we know it.
How far away is Kepler-154 d?
Kepler-154 d is about 2,985 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 52,536,000 years to get there.
How big is Kepler-154 d compared to Earth?
Kepler-154 d has 3.84 times the radius of Earth.
How long is a year on Kepler-154 d?
One orbit around Kepler-154 takes 20.5 Earth days — short enough that 18 of its years would fit into one Earth year.
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