Kepler-1705 c
Kepler-1705 c is a super-Earth orbiting Kepler-1705 in the constellation Cygnus. It lies about 5,328 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is Kepler-1705 c?
Kepler-1705 c has a radius of 2.05 times that of Earth. Its mass is 5.4 times that of Earth, giving it a density of 3.53 g/cm³ — between that of rocky and gaseous planets.
Is Kepler-1705 c in the Habitable Zone?
The position of Kepler-1705 c relative to the habitable zone of Kepler-1705 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-1705: 1.092–2.543 AU (conservative: 1.383–2.411 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-1705 c — one full orbit around Kepler-1705 — lasts 11.3 Earth days, shorter than Mercury's 88-day year. Its orbit is nearly circular (eccentricity 0.028).
How Was Kepler-1705 c Discovered?
Kepler-1705 c 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-1705 c?
Kepler-1705 c is 5,327.7 light-years (1,633.5 parsecs) from Earth. Light arriving here tonight left the planet about 5,328 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 93,767,520 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-1705 c scores 0.26, ranking #2,904 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-1705
Kepler-1705
- Surface temperature
- 6,312 K (Sun: 5,772 K)
- Mass
- 1.14 M☉
- Radius
- 1.26 R☉
- Luminosity
- 2.2600 L☉
- Age
- 2.6 billion years (Sun: 4.6)
The Kepler-1705 Planetary System
Kepler-1705 c is one of 2 known planets in the Kepler-1705 system. Its siblings:
- Kepler-1705 b (Mini Neptune)
Kepler-1705 c — Complete Data
| Radius | 2.050 Earth radii (0.183 Jupiter radii) |
|---|---|
| Mass | 5.42 Earth masses (0.017 Jupiter masses) |
| Density | 3.53 g/cm³ (Earth: 5.51) |
| Orbital period | 11.28 days |
| Eccentricity | 0.028 |
| Earth Similarity Index | 0.26 |
| Distance from Earth | 5,327.7 light-years (1,633.5 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2022-01-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-1705 c
Is Kepler-1705 c habitable?
Kepler-1705 c is not known to orbit within the habitable zone of Kepler-1705, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is Kepler-1705 c?
Kepler-1705 c is about 5,328 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 93,767,520 years to get there.
How big is Kepler-1705 c compared to Earth?
Kepler-1705 c has 2.05 times the radius of Earth and about 5.4 times its mass.
How long is a year on Kepler-1705 c?
One orbit around Kepler-1705 takes 11.3 Earth days — short enough that 32 of its years would fit into one Earth year.
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