TOI-7009 b
TOI-7009 b is a sub-Neptune orbiting TOI-7009 in the constellation Cygnus. It lies about 601 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-7009 b?
TOI-7009 b has a radius of 3.71 times that of Earth.
Is TOI-7009 b in the Habitable Zone?
TOI-7009 b orbits inside the inner edge of the habitable zone of TOI-7009. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-7009: 0.228–0.574 AU (conservative: 0.288–0.544 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-7009 b
The equilibrium temperature of TOI-7009 b is about 872 K (599 °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-7009 b — one full orbit around TOI-7009 — lasts 2.32 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.029 AU — closer to its star than Mercury is to the Sun.
How Was TOI-7009 b Discovered?
TOI-7009 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-7009 b?
TOI-7009 b is 600.5 light-years (184.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1426. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,568,800 years to make the journey.
The Host Star: TOI-7009
TOI-7009
- Surface temperature
- 4,080 K (Sun: 5,772 K)
- Mass
- 0.58 M☉
- Radius
- 0.56 R☉
Planetary System
TOI-7009 b is the only planet known to orbit TOI-7009 so far.
TOI-7009 b — Complete Data
| Radius | 3.710 Earth radii (0.331 Jupiter radii) |
|---|---|
| Orbital period | 2.32 days |
| Orbital distance | 0.029 AU |
| Equilibrium temperature | 872 K (599 °C) |
| Distance from Earth | 600.5 light-years (184.1 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-02-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-7009 b
Is TOI-7009 b habitable?
No — TOI-7009 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-7009 b?
TOI-7009 b is about 601 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,568,800 years to get there.
How big is TOI-7009 b compared to Earth?
TOI-7009 b has 3.71 times the radius of Earth.
How long is a year on TOI-7009 b?
One orbit around TOI-7009 takes 2.3 Earth days — short enough that 157 of its years would fit into one Earth year.
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