TOI-2285 b
TOI-2285 b is a super-Earth orbiting TOI-2285 in the constellation Cepheus. It lies about 138 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-2285 b?
TOI-2285 b has a radius of 1.77 times that of Earth.
Is TOI-2285 b in the Habitable Zone?
The position of TOI-2285 b relative to the habitable zone of TOI-2285 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-2285: 0.139–0.360 AU (conservative: 0.176–0.341 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2285 b
The equilibrium temperature of TOI-2285 b is about 358 K (85 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 3.91 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2285 b — one full orbit around TOI-2285 — lasts 13.6 Earth days, shorter than Mercury's 88-day year.
How Was TOI-2285 b Discovered?
TOI-2285 b was discovered in 2021 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-2285 b?
TOI-2285 b is 138.3 light-years (42.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1888. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,434,080 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-2285 b scores 0.75, ranking #37 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2285
TOI-2285
- Surface temperature
- 3,491 K (Sun: 5,772 K)
- Mass
- 0.45 M☉
- Radius
- 0.46 R☉
- Luminosity
- 0.0287 L☉
Planetary System
TOI-2285 b is the only planet known to orbit TOI-2285 so far.
TOI-2285 b — Complete Data
| Radius | 1.770 Earth radii (0.158 Jupiter radii) |
|---|---|
| Orbital period | 13.64 days |
| Equilibrium temperature | 358 K (85 °C) |
| Stellar irradiation | 3.91× Earth |
| Earth Similarity Index | 0.75 |
| Distance from Earth | 138.3 light-years (42.4 parsecs) |
| Constellation | Cepheus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2025-05-07. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2285 b
Is TOI-2285 b habitable?
TOI-2285 b is not known to orbit within the habitable zone of TOI-2285, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is TOI-2285 b?
TOI-2285 b is about 138 light-years from Earth in the constellation Cepheus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,434,080 years to get there.
How big is TOI-2285 b compared to Earth?
TOI-2285 b has 1.77 times the radius of Earth.
How long is a year on TOI-2285 b?
One orbit around TOI-2285 takes 13.6 Earth days — short enough that 27 of its years would fit into one Earth year.
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