TOI-672 b
TOI-672 b is a Neptune-like planet orbiting the M0 V star TOI-672 in the constellation Centaurus. It lies about 218 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-672 b?
TOI-672 b has a radius of 5.31 times that of Earth. Its mass is 50.9 times that of Earth, giving it a density of 1.86 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-672 b in the Habitable Zone?
TOI-672 b orbits inside the inner edge of the habitable zone of TOI-672. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-672: 0.178–0.456 AU (conservative: 0.226–0.432 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-672 b
The equilibrium temperature of TOI-672 b is about 700 K (426 °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 39.80 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-672 b — one full orbit around TOI-672 — lasts 3.63 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.038 AU — closer to its star than Mercury is to the Sun.
How Was TOI-672 b Discovered?
TOI-672 b was discovered in 2023 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-672 b?
TOI-672 b is 218.2 light-years (66.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1808. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,840,320 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-672 b scores 0.18, ranking #4,048 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-672
TOI-672
- Spectral type
- M0 V
- Surface temperature
- 3,810 K (Sun: 5,772 K)
- Mass
- 0.54 M☉
- Radius
- 0.54 R☉
- Luminosity
- 0.0480 L☉
Planetary System
TOI-672 b is the only planet known to orbit TOI-672 so far.
TOI-672 b — Complete Data
| Radius | 5.310 Earth radii (0.474 Jupiter radii) |
|---|---|
| Mass | 50.90 Earth masses (0.160 Jupiter masses) |
| Density | 1.86 g/cm³ (Earth: 5.51) |
| Orbital period | 3.63 days |
| Orbital distance | 0.038 AU |
| Equilibrium temperature | 700 K (426 °C) |
| Stellar irradiation | 39.80× Earth |
| Earth Similarity Index | 0.18 |
| Distance from Earth | 218.2 light-years (66.9 parsecs) |
| Constellation | Centaurus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2026-04-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-672 b
Is TOI-672 b habitable?
No — TOI-672 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-672 b?
TOI-672 b is about 218 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,840,320 years to get there.
How big is TOI-672 b compared to Earth?
TOI-672 b has 5.31 times the radius of Earth and about 50.9 times its mass.
How long is a year on TOI-672 b?
One orbit around TOI-672 takes 3.6 Earth days — short enough that 101 of its years would fit into one Earth year.
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