TOI-4552 b
TOI-4552 b is a terrestrial planet orbiting the M4.5 V star TOI-4552 in the constellation Ara. It lies about 89 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-4552 b?
TOI-4552 b has a radius of 1.11 times that of Earth. Its mass is 1.8 times that of Earth, giving it a density of 7.74 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-4552 b in the Habitable Zone?
TOI-4552 b orbits inside the inner edge of the habitable zone of TOI-4552. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4552: 0.075–0.197 AU (conservative: 0.095–0.187 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-4552 b
The equilibrium temperature of TOI-4552 b is about 1,122 K (849 °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 263 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-4552 b — one full orbit around TOI-4552 — lasts just 7.2 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.006 AU — closer to its star than Mercury is to the Sun.
How Was TOI-4552 b Discovered?
TOI-4552 b was discovered in 2026 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-4552 b?
TOI-4552 b is 88.9 light-years (27.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1938. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,564,640 years to make the journey.
The Host Star: TOI-4552
TOI-4552
- Spectral type
- M4.5 V
- Surface temperature
- 3,258 K (Sun: 5,772 K)
- Mass
- 0.26 M☉
- Radius
- 0.29 R☉
- Luminosity
- 0.0084 L☉
Planetary System
TOI-4552 b is the only planet known to orbit TOI-4552 so far.
TOI-4552 b — Complete Data
| Radius | 1.110 Earth radii (0.099 Jupiter radii) |
|---|---|
| Mass | 1.83 Earth masses (0.006 Jupiter masses) |
| Density | 7.74 g/cm³ (Earth: 5.51) |
| Orbital period | 0.30 days |
| Orbital distance | 0.006 AU |
| Equilibrium temperature | 1,122 K (849 °C) |
| Stellar irradiation | 263.00× Earth |
| Distance from Earth | 88.9 light-years (27.3 parsecs) |
| Constellation | Ara |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-04-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4552 b
Is TOI-4552 b habitable?
No — TOI-4552 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4552 b?
TOI-4552 b is about 89 light-years from Earth in the constellation Ara. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,564,640 years to get there.
How big is TOI-4552 b compared to Earth?
TOI-4552 b has 1.11 times the radius of Earth and about 1.8 times its mass.
How long is a year on TOI-4552 b?
One orbit around TOI-4552 takes 0.3 Earth days — short enough that 1,213 of its years would fit into one Earth year.
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