TOI-2018 b
TOI-2018 b is a super-Earth orbiting the K V star TOI-2018 in the constellation Corona Borealis. It lies about 91 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-2018 b?
TOI-2018 b has a radius of 2.27 times that of Earth. Its mass is 9.2 times that of Earth.
Is TOI-2018 b in the Habitable Zone?
The position of TOI-2018 b relative to the habitable zone of TOI-2018 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-2018: 0.255–0.641 AU (conservative: 0.324–0.608 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 TOI-2018 b — one full orbit around TOI-2018 — lasts 7.44 Earth days, shorter than Mercury's 88-day year.
How Was TOI-2018 b Discovered?
TOI-2018 b was discovered in 2023 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
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 TOI-2018 b?
TOI-2018 b is 91.3 light-years (28.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1935. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,606,880 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. TOI-2018 b scores 0.29, ranking #1,865 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2018
TOI-2018
- Spectral type
- K V
- Surface temperature
- 4,174 K (Sun: 5,772 K)
- Mass
- 0.57 M☉
- Radius
- 0.62 R☉
- Luminosity
- 0.1000 L☉
Planetary System
TOI-2018 b is the only planet known to orbit TOI-2018 so far.
TOI-2018 b — Complete Data
| Radius | 2.268 Earth radii (0.202 Jupiter radii) |
|---|---|
| Mass | 9.20 Earth masses (0.029 Jupiter masses) |
| Orbital period | 7.44 days |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 91.3 light-years (28.0 parsecs) |
| Constellation | Corona Borealis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-06-27. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2018 b
Is TOI-2018 b habitable?
TOI-2018 b is not known to orbit within the habitable zone of TOI-2018, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is TOI-2018 b?
TOI-2018 b is about 91 light-years from Earth in the constellation Corona Borealis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,606,880 years to get there.
How big is TOI-2018 b compared to Earth?
TOI-2018 b has 2.27 times the radius of Earth and about 9.2 times its mass.
How long is a year on TOI-2018 b?
One orbit around TOI-2018 takes 7.4 Earth days — short enough that 49 of its years would fit into one Earth year.
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