TOI-1472 b
TOI-1472 b is a Neptune-like planet orbiting TOI-1472 in the constellation Cassiopeia. It lies about 397 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1472 b?
TOI-1472 b has a radius of 4.06 times that of Earth. Its mass is 18.1 times that of Earth, giving it a density of 1.49 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1472 b in the Habitable Zone?
TOI-1472 b orbits inside the inner edge of the habitable zone of TOI-1472. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1472: 0.510–1.228 AU (conservative: 0.646–1.165 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1472 b
The equilibrium temperature of TOI-1472 b is about 891 K (618 °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.
Orbit and Year Length
A year on TOI-1472 b — one full orbit around TOI-1472 — lasts 6.36 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.064 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.041).
How Was TOI-1472 b Discovered?
TOI-1472 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-1472 b?
TOI-1472 b is 397.4 light-years (121.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1629. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,994,240 years to make the journey.
The Host Star: TOI-1472
TOI-1472
- Surface temperature
- 5,100 K (Sun: 5,772 K)
- Mass
- 0.87 M☉
- Radius
- 0.84 R☉
- Age
- 3.1 billion years (Sun: 4.6)
The TOI-1472 Planetary System
TOI-1472 b is one of 2 known planets in the TOI-1472 system. Its siblings:
- TOI-1472 c (Super Earth)
TOI-1472 b — Complete Data
| Radius | 4.058 Earth radii (0.362 Jupiter radii) |
|---|---|
| Mass | 18.05 Earth masses (0.057 Jupiter masses) |
| Density | 1.49 g/cm³ (Earth: 5.51) |
| Orbital period | 6.36 days |
| Orbital distance | 0.064 AU |
| Eccentricity | 0.041 |
| Equilibrium temperature | 891 K (618 °C) |
| Distance from Earth | 397.4 light-years (121.8 parsecs) |
| Constellation | Cassiopeia |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2025-12-11. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1472 b
Is TOI-1472 b habitable?
No — TOI-1472 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1472 b?
TOI-1472 b is about 397 light-years from Earth in the constellation Cassiopeia. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,994,240 years to get there.
How big is TOI-1472 b compared to Earth?
TOI-1472 b has 4.06 times the radius of Earth and about 18.1 times its mass.
How long is a year on TOI-1472 b?
One orbit around TOI-1472 takes 6.4 Earth days — short enough that 57 of its years would fit into one Earth year.
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