TOI-3862 b
TOI-3862 b is a Neptune-like planet orbiting TOI-3862 in the constellation Canes Venatici. It lies about 812 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-3862 b?
TOI-3862 b has a radius of 5.53 times that of Earth. Its mass is 53.7 times that of Earth, giving it a density of 1.75 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-3862 b in the Habitable Zone?
TOI-3862 b orbits inside the inner edge of the habitable zone of TOI-3862. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-3862: 0.597–1.428 AU (conservative: 0.756–1.353 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-3862 b
The equilibrium temperature of TOI-3862 b is about 1,539 K (1,266 °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-3862 b — one full orbit around TOI-3862 — lasts just 37.4 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.025 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.023).
How Was TOI-3862 b Discovered?
TOI-3862 b was discovered in 2026 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-3862 b?
TOI-3862 b is 812.2 light-years (249.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1214. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 14,294,720 years to make the journey.
The Host Star: TOI-3862
TOI-3862
- Surface temperature
- 5,300 K (Sun: 5,772 K)
- Mass
- 0.90 M☉
- Radius
- 0.92 R☉
Planetary System
TOI-3862 b is the only planet known to orbit TOI-3862 so far.
TOI-3862 b — Complete Data
| Radius | 5.530 Earth radii (0.493 Jupiter radii) |
|---|---|
| Mass | 53.70 Earth masses (0.169 Jupiter masses) |
| Density | 1.75 g/cm³ (Earth: 5.51) |
| Orbital period | 1.56 days |
| Orbital distance | 0.025 AU |
| Eccentricity | 0.023 |
| Equilibrium temperature | 1,539 K (1,266 °C) |
| Distance from Earth | 812.2 light-years (249.0 parsecs) |
| Constellation | Canes Venatici |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-03-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-3862 b
Is TOI-3862 b habitable?
No — TOI-3862 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-3862 b?
TOI-3862 b is about 812 light-years from Earth in the constellation Canes Venatici. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 14,294,720 years to get there.
How big is TOI-3862 b compared to Earth?
TOI-3862 b has 5.53 times the radius of Earth and about 53.7 times its mass.
How long is a year on TOI-3862 b?
One orbit around TOI-3862 takes 1.6 Earth days — short enough that 235 of its years would fit into one Earth year.
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