TOI-4860 b
TOI-4860 b is a hot Jupiter orbiting the M3.5 V star TOI-4860 in the constellation Corvus. It lies about 261 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-4860 b?
TOI-4860 b has a radius of 8.70 times that of Earth, or 0.77 times the radius of Jupiter. Its mass is 86.7 times that of Earth, giving it a density of 0.75 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-4860 b in the Habitable Zone?
TOI-4860 b orbits inside the inner edge of the habitable zone of TOI-4860. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4860: 0.093–0.245 AU (conservative: 0.118–0.233 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-4860 b
The equilibrium temperature of TOI-4860 b is about 694 K (421 °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 42.50 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-4860 b — one full orbit around TOI-4860 — lasts just 36.5 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.018 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.008).
How Was TOI-4860 b Discovered?
TOI-4860 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-4860 b?
TOI-4860 b is 261.4 light-years (80.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1765. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,600,640 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-4860 b scores 0.12, ranking #4,323 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-4860
TOI-4860
- Spectral type
- M3.5 V
- Surface temperature
- 3,260 K (Sun: 5,772 K)
- Mass
- 0.34 M☉
- Radius
- 0.36 R☉
Planetary System
TOI-4860 b is the only planet known to orbit TOI-4860 so far.
TOI-4860 b — Complete Data
| Radius | 8.700 Earth radii (0.770 Jupiter radii) |
|---|---|
| Mass | 86.70 Earth masses (0.273 Jupiter masses) |
| Density | 0.75 g/cm³ (Earth: 5.51) |
| Orbital period | 1.52 days |
| Orbital distance | 0.018 AU |
| Eccentricity | 0.008 |
| Equilibrium temperature | 694 K (421 °C) |
| Stellar irradiation | 42.50× Earth |
| Earth Similarity Index | 0.12 |
| Distance from Earth | 261.4 light-years (80.1 parsecs) |
| Constellation | Corvus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2024-03-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4860 b
Is TOI-4860 b habitable?
No — TOI-4860 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4860 b?
TOI-4860 b is about 261 light-years from Earth in the constellation Corvus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,600,640 years to get there.
How big is TOI-4860 b compared to Earth?
TOI-4860 b has 8.70 times the radius of Earth and about 86.7 times its mass.
How long is a year on TOI-4860 b?
One orbit around TOI-4860 takes 1.5 Earth days — short enough that 240 of its years would fit into one Earth year.
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