Kepler-1928 b
Kepler-1928 b is a super-Earth orbiting Kepler-1928 in the constellation Lyra. It lies about 1,064 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is Kepler-1928 b?
Kepler-1928 b has a radius of 1.99 times that of Earth.
Is Kepler-1928 b in the Habitable Zone?
Kepler-1928 b orbits inside the inner edge of the habitable zone of Kepler-1928. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of Kepler-1928: 0.678–1.599 AU (conservative: 0.858–1.516 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-1928 b — one full orbit around Kepler-1928 — lasts 19.6 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.194 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.43), swinging dramatically closer to and farther from its star.
How Was Kepler-1928 b Discovered?
Kepler-1928 b 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-1928 b?
Kepler-1928 b is 1,064.4 light-years (326.4 parsecs) from Earth. Light arriving here tonight left the planet about 1,064 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,733,440 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-1928 b scores 0.31, ranking #1,174 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-1928
Kepler-1928
- Surface temperature
- 5,720 K (Sun: 5,772 K)
- Mass
- 1.01 M☉
- Radius
- 0.92 R☉
- Luminosity
- 0.8100 L☉
- Age
- 0.1 billion years (Sun: 4.6)
Planetary System
Kepler-1928 b is the only planet known to orbit Kepler-1928 so far.
Kepler-1928 b — Complete Data
| Radius | 1.992 Earth radii (0.178 Jupiter radii) |
|---|---|
| Orbital period | 19.58 days |
| Orbital distance | 0.194 AU |
| Eccentricity | 0.430 |
| Earth Similarity Index | 0.31 |
| Distance from Earth | 1,064.4 light-years (326.4 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2022-07-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-1928 b
Is Kepler-1928 b habitable?
No — Kepler-1928 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is Kepler-1928 b?
Kepler-1928 b is about 1,064 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,733,440 years to get there.
How big is Kepler-1928 b compared to Earth?
Kepler-1928 b has 1.99 times the radius of Earth.
How long is a year on Kepler-1928 b?
One orbit around Kepler-1928 takes 19.6 Earth days — short enough that 19 of its years would fit into one Earth year.
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