TOI-5489 b
TOI-5489 b is a super-Earth orbiting TOI-5489 in the constellation Cancer. It lies about 147 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-5489 b?
TOI-5489 b has a radius of 1.40 times that of Earth.
Is TOI-5489 b in the Habitable Zone?
The position of TOI-5489 b relative to the habitable zone of TOI-5489 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-5489: 0.129–0.335 AU (conservative: 0.164–0.318 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 ›
Temperature on TOI-5489 b
The equilibrium temperature of TOI-5489 b is about 624 K (351 °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-5489 b — one full orbit around TOI-5489 — lasts 3.15 Earth days, shorter than Mercury's 88-day year.
How Was TOI-5489 b Discovered?
TOI-5489 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-5489 b?
TOI-5489 b is 147.1 light-years (45.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1879. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,588,960 years to make the journey.
The Host Star: TOI-5489
TOI-5489
- Surface temperature
- 3,547 K (Sun: 5,772 K)
- Mass
- 0.41 M☉
- Radius
- 0.42 R☉
The TOI-5489 Planetary System
TOI-5489 b is one of 2 known planets in the TOI-5489 system. Its siblings:
- TOI-5489 c (Super Earth)
TOI-5489 b — Complete Data
| Radius | 1.400 Earth radii (0.125 Jupiter radii) |
|---|---|
| Orbital period | 3.15 days |
| Equilibrium temperature | 624 K (351 °C) |
| Distance from Earth | 147.1 light-years (45.1 parsecs) |
| Constellation | Cancer |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2026-01-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5489 b
Is TOI-5489 b habitable?
TOI-5489 b is not known to orbit within the habitable zone of TOI-5489, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is TOI-5489 b?
TOI-5489 b is about 147 light-years from Earth in the constellation Cancer. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,588,960 years to get there.
How big is TOI-5489 b compared to Earth?
TOI-5489 b has 1.40 times the radius of Earth.
How long is a year on TOI-5489 b?
One orbit around TOI-5489 takes 3.2 Earth days — short enough that 116 of its years would fit into one Earth year.
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