TOI-283 b
TOI-283 b is a mini-Neptune orbiting the K star TOI-283 in the constellation Volans. It lies about 270 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-283 b?
TOI-283 b has a radius of 2.34 times that of Earth. Its mass is 6.5 times that of Earth, giving it a density of 2.81 g/cm³ — between that of rocky and gaseous planets.
Is TOI-283 b in the Habitable Zone?
TOI-283 b orbits inside the inner edge of the habitable zone of TOI-283. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-283: 0.526–1.261 AU (conservative: 0.666–1.195 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 ›
Temperature on TOI-283 b
The equilibrium temperature of TOI-283 b is about 661 K (388 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 30.40 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-283 b — one full orbit around TOI-283 — lasts 17.6 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.123 AU — closer to its star than Mercury is to the Sun.
How Was TOI-283 b Discovered?
TOI-283 b was discovered in 2025 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-283 b?
TOI-283 b is 269.7 light-years (82.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1757. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,746,720 years to make the journey.
The Host Star: TOI-283
TOI-283
- Spectral type
- K
- Surface temperature
- 5,213 K (Sun: 5,772 K)
- Mass
- 0.80 M☉
- Radius
- 0.85 R☉
- Luminosity
- 0.4600 L☉
- Age
- 10.4 billion years (Sun: 4.6)
Planetary System
TOI-283 b is the only planet known to orbit TOI-283 so far.
TOI-283 b — Complete Data
| Radius | 2.340 Earth radii (0.209 Jupiter radii) |
|---|---|
| Mass | 6.54 Earth masses (0.021 Jupiter masses) |
| Density | 2.81 g/cm³ (Earth: 5.51) |
| Orbital period | 17.62 days |
| Orbital distance | 0.123 AU |
| Equilibrium temperature | 661 K (388 °C) |
| Stellar irradiation | 30.40× Earth |
| Distance from Earth | 269.7 light-years (82.7 parsecs) |
| Constellation | Volans |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-11-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-283 b
Is TOI-283 b habitable?
No — TOI-283 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-283 b?
TOI-283 b is about 270 light-years from Earth in the constellation Volans. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,746,720 years to get there.
How big is TOI-283 b compared to Earth?
TOI-283 b has 2.34 times the radius of Earth and about 6.5 times its mass.
How long is a year on TOI-283 b?
One orbit around TOI-283 takes 17.6 Earth days — short enough that 21 of its years would fit into one Earth year.
Explore TOI-283 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
