Kepler-1855 b
Kepler-1855 b is a terrestrial planet orbiting Kepler-1855 in the constellation Lyra. It was discovered in 2021 using the transit method.
How Big Is Kepler-1855 b?
Kepler-1855 b has a radius of 1.22 times that of Earth.
Is Kepler-1855 b in the Habitable Zone?
The position of Kepler-1855 b relative to the habitable zone of Kepler-1855 cannot be precisely determined from the available orbital data.
Habitable zone of Kepler-1855: 0.104–0.272 AU (conservative: 0.132–0.258 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-1855 b — one full orbit around Kepler-1855 — lasts just 17.5 hours, shorter than Mercury's 88-day year.
How Was Kepler-1855 b Discovered?
Kepler-1855 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.
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-1855 b scores 0.29, ranking #1,664 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: Kepler-1855
Kepler-1855
- Surface temperature
- 3,460 K (Sun: 5,772 K)
- Mass
- 0.39 M☉
- Radius
- 0.36 R☉
Planetary System
Kepler-1855 b is the only planet known to orbit Kepler-1855 so far.
Kepler-1855 b — Complete Data
| Radius | 1.216 Earth radii (0.109 Jupiter radii) |
|---|---|
| Orbital period | 0.73 days |
| Earth Similarity Index | 0.29 |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Kepler |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-12-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About Kepler-1855 b
Is Kepler-1855 b habitable?
Kepler-1855 b is not known to orbit within the habitable zone of Kepler-1855, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How big is Kepler-1855 b compared to Earth?
Kepler-1855 b has 1.22 times the radius of Earth.
How long is a year on Kepler-1855 b?
One orbit around Kepler-1855 takes 0.7 Earth days — short enough that 502 of its years would fit into one Earth year.
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