TOI-2338 b
TOI-2338 b is a cold gas giant orbiting TOI-2338 in the constellation Columba. It lies about 1,024 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-2338 b?
TOI-2338 b has a radius of 11.21 times that of Earth, or 1.00 times the radius of Jupiter. Its mass is 1,901 times that of Earth.
Is TOI-2338 b in the Habitable Zone?
TOI-2338 b orbits inside the inner edge of the habitable zone of TOI-2338. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2338: 0.748–1.772 AU (conservative: 0.947–1.680 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2338 b
The equilibrium temperature of TOI-2338 b is about 799 K (526 °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-2338 b — one full orbit around TOI-2338 — lasts 22.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.158 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.68), swinging dramatically closer to and farther from its star.
How Was TOI-2338 b Discovered?
TOI-2338 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-2338 b?
TOI-2338 b is 1,024.1 light-years (314.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1002. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,024,160 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-2338 b scores 0.10, ranking #4,448 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2338
TOI-2338
- Surface temperature
- 5,581 K (Sun: 5,772 K)
- Mass
- 0.99 M☉
- Radius
- 1.05 R☉
- Luminosity
- 0.9700 L☉
- Age
- 7.0 billion years (Sun: 4.6)
Planetary System
TOI-2338 b is the only planet known to orbit TOI-2338 so far.
TOI-2338 b — Complete Data
| Radius | 11.209 Earth radii (1.000 Jupiter radii) |
|---|---|
| Mass | 1,900.61 Earth masses (5.980 Jupiter masses) |
| Orbital period | 22.65 days |
| Orbital distance | 0.158 AU |
| Eccentricity | 0.676 |
| Equilibrium temperature | 799 K (526 °C) |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 1,024.1 light-years (314.0 parsecs) |
| Constellation | Columba |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-04-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2338 b
Is TOI-2338 b habitable?
No — TOI-2338 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2338 b?
TOI-2338 b is about 1,024 light-years from Earth in the constellation Columba. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,024,160 years to get there.
How big is TOI-2338 b compared to Earth?
TOI-2338 b has 11.21 times the radius of Earth and about 1,901 times its mass.
How long is a year on TOI-2338 b?
One orbit around TOI-2338 takes 22.7 Earth days — short enough that 16 of its years would fit into one Earth year.
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