TOI-2025 b
TOI-2025 b is a hot Jupiter orbiting TOI-2025 in the constellation Draco. It lies about 1,096 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-2025 b?
TOI-2025 b has a radius of 11.89 times that of Earth, or 1.06 times the radius of Jupiter. Its mass is 1,144 times that of Earth, giving it a density of 3.74 g/cm³ — between that of rocky and gaseous planets.
Is TOI-2025 b in the Habitable Zone?
TOI-2025 b orbits inside the inner edge of the habitable zone of TOI-2025. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2025: 1.158–2.715 AU (conservative: 1.467–2.574 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2025 b
The equilibrium temperature of TOI-2025 b is about 1,166 K (893 °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-2025 b — one full orbit around TOI-2025 — lasts 8.87 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.089 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-2025 b Discovered?
TOI-2025 b was discovered in 2022 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-2025 b?
TOI-2025 b is 1,095.8 light-years (336.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,096 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,286,080 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-2025 b scores 0.08, ranking #4,725 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2025
TOI-2025
- Surface temperature
- 5,977 K (Sun: 5,772 K)
- Mass
- 1.20 M☉
- Radius
- 1.46 R☉
- Luminosity
- 2.4400 L☉
- Age
- 4.5 billion years (Sun: 4.6)
Planetary System
TOI-2025 b is the only planet known to orbit TOI-2025 so far.
TOI-2025 b — Complete Data
| Radius | 11.893 Earth radii (1.061 Jupiter radii) |
|---|---|
| Mass | 1,144.18 Earth masses (3.600 Jupiter masses) |
| Density | 3.74 g/cm³ (Earth: 5.51) |
| Orbital period | 8.87 days |
| Orbital distance | 0.089 AU |
| Eccentricity | 0.394 |
| Equilibrium temperature | 1,166 K (893 °C) |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 1,095.8 light-years (336.0 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2023-03-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2025 b
Is TOI-2025 b habitable?
No — TOI-2025 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2025 b?
TOI-2025 b is about 1,096 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,286,080 years to get there.
How big is TOI-2025 b compared to Earth?
TOI-2025 b has 11.89 times the radius of Earth and about 1,144 times its mass.
How long is a year on TOI-2025 b?
One orbit around TOI-2025 takes 8.9 Earth days — short enough that 41 of its years would fit into one Earth year.
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