Kepler-1649 b
Kepler-1649 b is a terrestrial planet orbiting Kepler-1649 in the constellation Cygnus. It lies about 301 light-years from Earth and was discovered in 2017 using the transit method.
How Big Is Kepler-1649 b?
Kepler-1649 b has a radius of 1.02 times that of Earth.
Is Kepler-1649 b in the Habitable Zone?
The position of Kepler-1649 b relative to the habitable zone of Kepler-1649 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-1649: 0.059–0.155 AU (conservative: 0.075–0.147 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on Kepler-1649 b
The equilibrium temperature of Kepler-1649 b is about 307 K (34 °C) — in a range broadly comparable to Earth, whose equilibrium temperature is 255 K. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 2.21 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on Kepler-1649 b — one full orbit around Kepler-1649 — lasts 8.69 Earth days, shorter than Mercury's 88-day year.
How Was Kepler-1649 b Discovered?
Kepler-1649 b was discovered in 2017 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-1649 b?
Kepler-1649 b is 300.7 light-years (92.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1726. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,292,320 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-1649 b scores 0.77, ranking #31 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-1649
Kepler-1649
- Surface temperature
- 3,240 K (Sun: 5,772 K)
- Mass
- 0.20 M☉
- Radius
- 0.23 R☉
- Luminosity
- 0.0052 L☉
The Kepler-1649 Planetary System
Kepler-1649 b is one of 2 known planets in the Kepler-1649 system. Its siblings:
- Kepler-1649 c (Terrestrial)
Kepler-1649 b — Complete Data
| Radius | 1.017 Earth radii (0.091 Jupiter radii) |
|---|---|
| Orbital period | 8.69 days |
| Equilibrium temperature | 307 K (34 °C) |
| Stellar irradiation | 2.21× Earth |
| Earth Similarity Index | 0.77 |
| Distance from Earth | 300.7 light-years (92.2 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2020-04-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-1649 b
Is Kepler-1649 b habitable?
Kepler-1649 b is not known to orbit within the habitable zone of Kepler-1649, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is Kepler-1649 b?
Kepler-1649 b is about 301 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,292,320 years to get there.
How big is Kepler-1649 b compared to Earth?
Kepler-1649 b has 1.02 times the radius of Earth.
How long is a year on Kepler-1649 b?
One orbit around Kepler-1649 takes 8.7 Earth days — short enough that 42 of its years would fit into one Earth year.
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