TOI-3288 b
TOI-3288 b is a hot Jupiter orbiting the M0±0.5 star TOI-3288 in the constellation Sagittarius. It lies about 654 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-3288 b?
TOI-3288 b has a radius of 12.24 times that of Earth, or 1.09 times the radius of Jupiter. Its mass is 536 times that of Earth, giving it a density of 1.60 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-3288 b in the Habitable Zone?
TOI-3288 b orbits inside the inner edge of the habitable zone of TOI-3288. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-3288: 0.271–0.683 AU (conservative: 0.343–0.647 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-3288 b
The equilibrium temperature of TOI-3288 b is about 973 K (700 °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 214 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-3288 b — one full orbit around TOI-3288 — lasts just 34.4 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.023 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.021).
How Was TOI-3288 b Discovered?
TOI-3288 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-3288 b?
TOI-3288 b is 653.9 light-years (200.5 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 11,508,640 years to make the journey.
The Host Star: TOI-3288
TOI-3288 b belongs to a system of 2 stars; it orbits TOI-3288.
TOI-3288
- Spectral type
- M0±0.5
- Surface temperature
- 4,072 K (Sun: 5,772 K)
- Mass
- 0.64 M☉
- Radius
- 0.67 R☉
- Luminosity
- 0.1117 L☉
Planetary System
TOI-3288 b is the only planet known to orbit TOI-3288 so far.
TOI-3288 b — Complete Data
| Radius | 12.240 Earth radii (1.092 Jupiter radii) |
|---|---|
| Mass | 536.18 Earth masses (1.687 Jupiter masses) |
| Density | 1.60 g/cm³ (Earth: 5.51) |
| Orbital period | 1.43 days |
| Orbital distance | 0.023 AU |
| Eccentricity | 0.021 |
| Equilibrium temperature | 973 K (700 °C) |
| Stellar irradiation | 213.80× Earth |
| Distance from Earth | 653.9 light-years (200.5 parsecs) |
| Constellation | Sagittarius |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2026-04-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-3288 b
Is TOI-3288 b habitable?
No — TOI-3288 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-3288 b?
TOI-3288 b is about 654 light-years from Earth in the constellation Sagittarius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,508,640 years to get there.
How big is TOI-3288 b compared to Earth?
TOI-3288 b has 12.24 times the radius of Earth and about 536 times its mass.
How long is a year on TOI-3288 b?
One orbit around TOI-3288 takes 1.4 Earth days — short enough that 255 of its years would fit into one Earth year.
Explore TOI-3288 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
