TOI-4602.01
TOI-4602.01 is a mini-Neptune orbiting the G5 star TOI-4602 in the constellation Perseus. It lies about 206 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-4602.01?
TOI-4602.01 has a radius of 2.45 times that of Earth. Its mass is 5.5 times that of Earth, giving it a density of 2.18 g/cm³ — between that of rocky and gaseous planets.
Is TOI-4602.01 in the Habitable Zone?
TOI-4602.01 orbits inside the inner edge of the habitable zone of TOI-4602. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4602: 0.846–1.984 AU (conservative: 1.072–1.881 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-4602.01
The equilibrium temperature of TOI-4602.01 is about 1,344 K (1,071 °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 664 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-4602.01 — one full orbit around TOI-4602 — lasts 3.98 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.047 AU — closer to its star than Mercury is to the Sun.
How Was TOI-4602.01 Discovered?
TOI-4602.01 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-4602.01?
TOI-4602.01 is 205.7 light-years (63.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1821. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,620,320 years to make the journey.
The Host Star: TOI-4602
TOI-4602
- Spectral type
- G5
- Surface temperature
- 5,966 K (Sun: 5,772 K)
- Mass
- 0.90 M☉
- Radius
- 1.08 R☉
- Luminosity
- 1.3000 L☉
Planetary System
TOI-4602.01 is the only planet known to orbit TOI-4602 so far.
TOI-4602.01 — Complete Data
| Radius | 2.450 Earth radii (0.219 Jupiter radii) |
|---|---|
| Mass | 5.53 Earth masses (0.017 Jupiter masses) |
| Density | 2.18 g/cm³ (Earth: 5.51) |
| Orbital period | 3.98 days |
| Orbital distance | 0.047 AU |
| Equilibrium temperature | 1,344 K (1,071 °C) |
| Stellar irradiation | 664.00× Earth |
| Distance from Earth | 205.7 light-years (63.1 parsecs) |
| Constellation | Perseus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2026-07-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4602.01
Is TOI-4602.01 habitable?
No — TOI-4602.01 orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4602.01?
TOI-4602.01 is about 206 light-years from Earth in the constellation Perseus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,620,320 years to get there.
How big is TOI-4602.01 compared to Earth?
TOI-4602.01 has 2.45 times the radius of Earth and about 5.5 times its mass.
How long is a year on TOI-4602.01?
One orbit around TOI-4602 takes 4.0 Earth days — short enough that 92 of its years would fit into one Earth year.
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