TOI-469.01
TOI-469.01 is a puffy low-density planet orbiting TOI-469 in the constellation Lepus. It lies about 222 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-469.01?
TOI-469.01 has a radius of 3.41 times that of Earth. Its mass is 9.1 times that of Earth.
Is TOI-469.01 in the Habitable Zone?
TOI-469.01 orbits inside the inner edge of the habitable zone of TOI-469. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-469: 0.634–1.516 AU (conservative: 0.803–1.437 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-469.01
The equilibrium temperature of TOI-469.01 is about 716 K (443 °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 74.70 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-469.01 — one full orbit around TOI-469 — lasts 13.6 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.111 AU — closer to its star than Mercury is to the Sun.
How Was TOI-469.01 Discovered?
TOI-469.01 was discovered in 2021 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-469.01?
TOI-469.01 is 222.4 light-years (68.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1804. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,914,240 years to make the journey.
The Host Star: TOI-469
TOI-469
- Surface temperature
- 5,289 K (Sun: 5,772 K)
- Mass
- 0.90 M☉
- Radius
- 0.98 R☉
- Age
- 11.2 billion years (Sun: 4.6)
The TOI-469 Planetary System
TOI-469.01 is one of 3 known planets in the TOI-469 system. Its siblings:
- HIP 29442 c (Super Earth)
- HIP 29442 d (Super Earth)
TOI-469.01 — Complete Data
| Radius | 3.410 Earth radii (0.304 Jupiter radii) |
|---|---|
| Mass | 9.10 Earth masses (0.029 Jupiter masses) |
| Orbital period | 13.63 days |
| Orbital distance | 0.111 AU |
| Equilibrium temperature | 716 K (443 °C) |
| Stellar irradiation | 74.70× Earth |
| Distance from Earth | 222.4 light-years (68.2 parsecs) |
| Constellation | Lepus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2024-09-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-469.01
Is TOI-469.01 habitable?
No — TOI-469.01 orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-469.01?
TOI-469.01 is about 222 light-years from Earth in the constellation Lepus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,914,240 years to get there.
How big is TOI-469.01 compared to Earth?
TOI-469.01 has 3.41 times the radius of Earth and about 9.1 times its mass.
How long is a year on TOI-469.01?
One orbit around TOI-469 takes 13.6 Earth days — short enough that 27 of its years would fit into one Earth year.
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