TOI-1224 b
TOI-1224 b is a mini-Neptune orbiting TOI-1224 in the constellation Hydrus. It lies about 122 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1224 b?
TOI-1224 b has a radius of 2.10 times that of Earth.
Is TOI-1224 b in the Habitable Zone?
TOI-1224 b orbits inside the inner edge of the habitable zone of TOI-1224. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1224: 0.116–0.304 AU (conservative: 0.147–0.288 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-1224 b
The equilibrium temperature of TOI-1224 b is about 541 K (268 °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.
Orbit and Year Length
A year on TOI-1224 b — one full orbit around TOI-1224 — lasts 4.18 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.036 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1224 b Discovered?
TOI-1224 b was discovered in 2024 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-1224 b?
TOI-1224 b is 121.8 light-years (37.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1905. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,143,680 years to make the journey.
The Host Star: TOI-1224
TOI-1224
- Surface temperature
- 3,326 K (Sun: 5,772 K)
- Mass
- 0.40 M☉
- Radius
- 0.40 R☉
- Luminosity
- 0.0201 L☉
- Age
- 0.2 billion years (Sun: 4.6)
The TOI-1224 Planetary System
TOI-1224 b is one of 2 known planets in the TOI-1224 system. Its siblings:
- TOI-1224 c (Mini Neptune)
TOI-1224 b — Complete Data
| Radius | 2.104 Earth radii (0.188 Jupiter radii) |
|---|---|
| Orbital period | 4.18 days |
| Orbital distance | 0.036 AU |
| Equilibrium temperature | 541 K (268 °C) |
| Distance from Earth | 121.8 light-years (37.3 parsecs) |
| Constellation | Hydrus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-07-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1224 b
Is TOI-1224 b habitable?
No — TOI-1224 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1224 b?
TOI-1224 b is about 122 light-years from Earth in the constellation Hydrus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,143,680 years to get there.
How big is TOI-1224 b compared to Earth?
TOI-1224 b has 2.10 times the radius of Earth.
How long is a year on TOI-1224 b?
One orbit around TOI-1224 takes 4.2 Earth days — short enough that 87 of its years would fit into one Earth year.
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