TOI-5027 b
TOI-5027 b is a hot Jupiter orbiting TOI-5027 in the constellation Triangulum Australe. It lies about 667 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-5027 b?
TOI-5027 b has a radius of 10.76 times that of Earth, or 0.96 times the radius of Jupiter. Its mass is 642 times that of Earth, giving it a density of 2.94 g/cm³ — between that of rocky and gaseous planets.
Is TOI-5027 b in the Habitable Zone?
TOI-5027 b orbits inside the inner edge of the habitable zone of TOI-5027. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5027: 0.719–1.688 AU (conservative: 0.910–1.600 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5027 b
The equilibrium temperature of TOI-5027 b is about 1,056 K (783 °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-5027 b — one full orbit around TOI-5027 — lasts 10.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.093 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.39), swinging dramatically closer to and farther from its star.
How Was TOI-5027 b Discovered?
TOI-5027 b was discovered in 2025 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-5027 b?
TOI-5027 b is 666.8 light-years (204.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1360. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,735,680 years to make the journey.
The Host Star: TOI-5027
TOI-5027
- Surface temperature
- 5,909 K (Sun: 5,772 K)
- Mass
- 1.02 M☉
- Radius
- 0.92 R☉
- Luminosity
- 0.9320 L☉
- Age
- 0.4 billion years (Sun: 4.6)
Planetary System
TOI-5027 b is the only planet known to orbit TOI-5027 so far.
TOI-5027 b — Complete Data
| Radius | 10.761 Earth radii (0.960 Jupiter radii) |
|---|---|
| Mass | 642.01 Earth masses (2.020 Jupiter masses) |
| Density | 2.94 g/cm³ (Earth: 5.51) |
| Orbital period | 10.24 days |
| Orbital distance | 0.093 AU |
| Eccentricity | 0.385 |
| Equilibrium temperature | 1,056 K (783 °C) |
| Distance from Earth | 666.8 light-years (204.4 parsecs) |
| Constellation | Triangulum Australe |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-03-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5027 b
Is TOI-5027 b habitable?
No — TOI-5027 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5027 b?
TOI-5027 b is about 667 light-years from Earth in the constellation Triangulum Australe. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,735,680 years to get there.
How big is TOI-5027 b compared to Earth?
TOI-5027 b has 10.76 times the radius of Earth and about 642 times its mass.
How long is a year on TOI-5027 b?
One orbit around TOI-5027 takes 10.2 Earth days — short enough that 36 of its years would fit into one Earth year.
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