TOI-4504 b
TOI-4504 b is a mini-Neptune orbiting the K1 V star TOI-4504 in the constellation Carina. It lies about 1,117 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-4504 b?
TOI-4504 b has a radius of 2.69 times that of Earth.
Is TOI-4504 b in the Habitable Zone?
TOI-4504 b orbits inside the inner edge of the habitable zone of TOI-4504. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4504: 0.607–1.450 AU (conservative: 0.769–1.375 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on TOI-4504 b — one full orbit around TOI-4504 — lasts 2.43 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.034 AU — closer to its star than Mercury is to the Sun.
How Was TOI-4504 b Discovered?
TOI-4504 b was discovered in 2024 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-4504 b?
TOI-4504 b is 1,117.4 light-years (342.6 parsecs) from Earth. Light arriving here tonight left the planet about 1,117 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,666,240 years to make the journey.
The Host Star: TOI-4504
TOI-4504
- Spectral type
- K1 V
- Surface temperature
- 5,315 K (Sun: 5,772 K)
- Mass
- 0.89 M☉
- Radius
- 0.92 R☉
- Luminosity
- 0.6200 L☉
- Age
- 10.0 billion years (Sun: 4.6)
The TOI-4504 Planetary System
TOI-4504 b is one of 3 known planets in the TOI-4504 system. Its siblings:
- TOI-4504 c (Cold Gas Giant)
- TOI-4504 d (Cold Gas Giant)
TOI-4504 b — Complete Data
| Radius | 2.691 Earth radii (0.240 Jupiter radii) |
|---|---|
| Orbital period | 2.43 days |
| Orbital distance | 0.034 AU |
| Distance from Earth | 1,117.4 light-years (342.6 parsecs) |
| Constellation | Carina |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2025-01-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4504 b
Is TOI-4504 b habitable?
No — TOI-4504 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4504 b?
TOI-4504 b is about 1,117 light-years from Earth in the constellation Carina. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,666,240 years to get there.
How big is TOI-4504 b compared to Earth?
TOI-4504 b has 2.69 times the radius of Earth.
How long is a year on TOI-4504 b?
One orbit around TOI-4504 takes 2.4 Earth days — short enough that 151 of its years would fit into one Earth year.
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