TOI-2589 b
TOI-2589 b is a cold gas giant orbiting TOI-2589 in the constellation Puppis. It lies about 653 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-2589 b?
TOI-2589 b has a radius of 12.11 times that of Earth, or 1.08 times the radius of Jupiter. Its mass is 1,112 times that of Earth.
Is TOI-2589 b in the Habitable Zone?
TOI-2589 b orbits inside the inner edge of the habitable zone of TOI-2589. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2589: 0.756–1.790 AU (conservative: 0.957–1.697 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2589 b
The equilibrium temperature of TOI-2589 b is about 592 K (319 °C) — hotter than anywhere on Earth. 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-2589 b — one full orbit around TOI-2589 — lasts 61.6 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.300 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.52), swinging dramatically closer to and farther from its star.
How Was TOI-2589 b Discovered?
TOI-2589 b was discovered in 2023 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-2589 b?
TOI-2589 b is 653.2 light-years (200.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1373. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,496,320 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-2589 b scores 0.15, ranking #4,220 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2589
TOI-2589
- Surface temperature
- 5,579 K (Sun: 5,772 K)
- Mass
- 0.93 M☉
- Radius
- 1.07 R☉
- Luminosity
- 0.9900 L☉
- Age
- 11.0 billion years (Sun: 4.6)
Planetary System
TOI-2589 b is the only planet known to orbit TOI-2589 so far.
TOI-2589 b — Complete Data
| Radius | 12.106 Earth radii (1.080 Jupiter radii) |
|---|---|
| Mass | 1,112.40 Earth masses (3.500 Jupiter masses) |
| Orbital period | 61.63 days |
| Orbital distance | 0.300 AU |
| Eccentricity | 0.522 |
| Equilibrium temperature | 592 K (319 °C) |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 653.2 light-years (200.3 parsecs) |
| Constellation | Puppis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2024-06-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2589 b
Is TOI-2589 b habitable?
No — TOI-2589 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2589 b?
TOI-2589 b is about 653 light-years from Earth in the constellation Puppis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,496,320 years to get there.
How big is TOI-2589 b compared to Earth?
TOI-2589 b has 12.11 times the radius of Earth and about 1,112 times its mass.
How long is a year on TOI-2589 b?
One orbit around TOI-2589 takes 61.6 Earth days.
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