Kepler-84 d
Kepler-84 d is a super-Earth orbiting Kepler-84 in the constellation Cygnus. It lies about 3,340 light-years from Earth and was discovered in 2014 using the transit method.
How Big Is Kepler-84 d?
Kepler-84 d has a radius of 1.38 times that of Earth.
Is Kepler-84 d in the Habitable Zone?
The position of Kepler-84 d relative to the habitable zone of Kepler-84 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on Kepler-84 d — one full orbit around Kepler-84 — lasts 4.22 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.052 AU — closer to its star than Mercury is to the Sun.
How Was Kepler-84 d Discovered?
Kepler-84 d was discovered in 2014 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-84 d?
Kepler-84 d is 3,339.5 light-years (1,023.9 parsecs) from Earth. Light arriving here tonight left the planet about 3,340 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 58,775,200 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-84 d scores 0.29, ranking #2,027 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-84
Kepler-84
- Mass
- 1.00 M☉
- Radius
- 1.43 R☉
The Kepler-84 Planetary System
Kepler-84 d is one of 5 known planets in the Kepler-84 system. Its siblings:
- Kepler-84 b (Mini Neptune)
- Kepler-84 c (Mini Neptune)
- Kepler-84 e (Mini Neptune)
- Kepler-84 f (Mini Neptune)
Kepler-84 d — Complete Data
| Radius | 1.380 Earth radii (0.123 Jupiter radii) |
|---|---|
| Orbital period | 4.22 days |
| Orbital distance | 0.052 AU |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 3,339.5 light-years (1,023.9 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-84 d
Is Kepler-84 d habitable?
Kepler-84 d is not known to orbit within the habitable zone of Kepler-84, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-84 d?
Kepler-84 d is about 3,340 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 58,775,200 years to get there.
How big is Kepler-84 d compared to Earth?
Kepler-84 d has 1.38 times the radius of Earth.
How long is a year on Kepler-84 d?
One orbit around Kepler-84 takes 4.2 Earth days — short enough that 86 of its years would fit into one Earth year.
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