TOI-4479 b
TOI-4479 b is a mini-Neptune orbiting the M3.0 star TOI-4479 in the constellation Vulpecula. It lies about 263 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-4479 b?
TOI-4479 b has a radius of 2.82 times that of Earth.
Is TOI-4479 b in the Habitable Zone?
TOI-4479 b orbits inside the inner edge of the habitable zone of TOI-4479. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4479: 0.129–0.337 AU (conservative: 0.164–0.319 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-4479 b
The equilibrium temperature of TOI-4479 b is about 861 K (588 °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 92.50 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-4479 b — one full orbit around TOI-4479 — lasts just 27.8 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.016 AU — closer to its star than Mercury is to the Sun.
How Was TOI-4479 b Discovered?
TOI-4479 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-4479 b?
TOI-4479 b is 263.1 light-years (80.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1763. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,630,560 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-4479 b scores 0.23, ranking #3,506 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-4479
TOI-4479
- Spectral type
- M3.0
- Surface temperature
- 3,400 K (Sun: 5,772 K)
- Mass
- 0.45 M☉
- Radius
- 0.45 R☉
- Luminosity
- 0.0249 L☉
Planetary System
TOI-4479 b is the only planet known to orbit TOI-4479 so far.
TOI-4479 b — Complete Data
| Radius | 2.820 Earth radii (0.252 Jupiter radii) |
|---|---|
| Orbital period | 1.16 days |
| Orbital distance | 0.016 AU |
| Equilibrium temperature | 861 K (588 °C) |
| Stellar irradiation | 92.50× Earth |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 263.1 light-years (80.7 parsecs) |
| Constellation | Vulpecula |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-06-27. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4479 b
Is TOI-4479 b habitable?
No — TOI-4479 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4479 b?
TOI-4479 b is about 263 light-years from Earth in the constellation Vulpecula. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,630,560 years to get there.
How big is TOI-4479 b compared to Earth?
TOI-4479 b has 2.82 times the radius of Earth.
How long is a year on TOI-4479 b?
One orbit around TOI-4479 takes 1.2 Earth days — short enough that 315 of its years would fit into one Earth year.
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