TOI-4336 A b
TOI-4336 A b is a mini-Neptune orbiting the M3.5 V star TOI-4336 A in the constellation Centaurus. It lies about 74 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-4336 A b?
TOI-4336 A b has a radius of 2.14 times that of Earth. Its mass is 3.3 times that of Earth, giving it a density of 1.87 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-4336 A b in the Habitable Zone?
TOI-4336 A b orbits inside the inner edge of the habitable zone of TOI-4336 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4336 A: 0.086–0.225 AU (conservative: 0.109–0.214 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-4336 A b
The equilibrium temperature of TOI-4336 A b is about 309 K (36 °C) — in a range broadly comparable to Earth, whose equilibrium temperature is 255 K. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 1.53 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-4336 A b — one full orbit around TOI-4336 A — lasts 16.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.085 AU — closer to its star than Mercury is to the Sun.
How Was TOI-4336 A b Discovered?
TOI-4336 A 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-4336 A b?
TOI-4336 A b is 73.5 light-years (22.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1953. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,293,600 years to make the journey.
The Host Star: TOI-4336 A
TOI-4336 A b belongs to a system of 3 stars; it orbits TOI-4336 A.
TOI-4336 A
- Spectral type
- M3.5 V
- Surface temperature
- 3,307 K (Sun: 5,772 K)
- Mass
- 0.31 M☉
- Radius
- 0.33 R☉
- Luminosity
- 0.0110 L☉
The TOI-4336 A Planetary System
TOI-4336 A b is one of 2 known planets in the TOI-4336 A system. Its siblings:
- TOI-4336 A c (Super Earth)
TOI-4336 A b — Complete Data
| Radius | 2.137 Earth radii (0.191 Jupiter radii) |
|---|---|
| Mass | 3.33 Earth masses (0.010 Jupiter masses) |
| Density | 1.87 g/cm³ (Earth: 5.51) |
| Orbital period | 16.34 days |
| Orbital distance | 0.085 AU |
| Equilibrium temperature | 309 K (36 °C) |
| Stellar irradiation | 1.53× Earth |
| Distance from Earth | 73.5 light-years (22.5 parsecs) |
| Constellation | Centaurus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2026-02-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4336 A b
Is TOI-4336 A b habitable?
No — TOI-4336 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4336 A b?
TOI-4336 A b is about 74 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,293,600 years to get there.
How big is TOI-4336 A b compared to Earth?
TOI-4336 A b has 2.14 times the radius of Earth and about 3.3 times its mass.
How long is a year on TOI-4336 A b?
One orbit around TOI-4336 A takes 16.3 Earth days — short enough that 22 of its years would fit into one Earth year.
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