TOI-2169 A b
TOI-2169 A b is a hot Jupiter orbiting TOI-2169 A in the constellation Hercules. It lies about 1,146 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-2169 A b?
TOI-2169 A b has a radius of 12.51 times that of Earth, or 1.12 times the radius of Jupiter. Its mass is 330 times that of Earth, giving it a density of 0.92 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-2169 A b in the Habitable Zone?
TOI-2169 A b orbits inside the inner edge of the habitable zone of TOI-2169 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2169 A: 1.567–3.652 AU (conservative: 1.985–3.462 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2169 A b
The equilibrium temperature of TOI-2169 A b is about 1,364 K (1,091 °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 577 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2169 A b — one full orbit around TOI-2169 A — lasts 8.21 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.090 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.045).
How Was TOI-2169 A b Discovered?
TOI-2169 A 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-2169 A b?
TOI-2169 A b is 1,146.4 light-years (351.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,146 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 20,176,640 years to make the journey.
The Host Star: TOI-2169 A
TOI-2169 A b belongs to a system of 2 stars; it orbits TOI-2169 A.
TOI-2169 A
- Surface temperature
- 6,270 K (Sun: 5,772 K)
- Mass
- 1.42 M☉
- Radius
- 1.82 R☉
- Luminosity
- 4.6300 L☉
- Age
- 2.5 billion years (Sun: 4.6)
Planetary System
TOI-2169 A b is the only planet known to orbit TOI-2169 A so far.
TOI-2169 A b — Complete Data
| Radius | 12.509 Earth radii (1.116 Jupiter radii) |
|---|---|
| Mass | 329.59 Earth masses (1.037 Jupiter masses) |
| Density | 0.92 g/cm³ (Earth: 5.51) |
| Orbital period | 8.21 days |
| Orbital distance | 0.090 AU |
| Eccentricity | 0.045 |
| Equilibrium temperature | 1,364 K (1,091 °C) |
| Stellar irradiation | 577.00× Earth |
| Distance from Earth | 1,146.4 light-years (351.5 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-07-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2169 A b
Is TOI-2169 A b habitable?
No — TOI-2169 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2169 A b?
TOI-2169 A b is about 1,146 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 20,176,640 years to get there.
How big is TOI-2169 A b compared to Earth?
TOI-2169 A b has 12.51 times the radius of Earth and about 330 times its mass.
How long is a year on TOI-2169 A b?
One orbit around TOI-2169 A takes 8.2 Earth days — short enough that 44 of its years would fit into one Earth year.
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