TOI-1333 b
TOI-1333 b is a hot Jupiter orbiting TOI-1333 in the constellation Cygnus. It lies about 654 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-1333 b?
TOI-1333 b has a radius of 15.65 times that of Earth, or 1.40 times the radius of Jupiter. Its mass is 753 times that of Earth, giving it a density of 1.08 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1333 b in the Habitable Zone?
TOI-1333 b orbits inside the inner edge of the habitable zone of TOI-1333. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1333: 1.656–3.858 AU (conservative: 2.097–3.657 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-1333 b
The equilibrium temperature of TOI-1333 b is about 1,679 K (1,406 °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-1333 b — one full orbit around TOI-1333 — lasts 4.72 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.063 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.07).
How Was TOI-1333 b Discovered?
TOI-1333 b was discovered in 2021 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-1333 b?
TOI-1333 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.
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-1333 b scores 0.06, ranking #5,165 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1333
TOI-1333 b belongs to a system of 2 stars; it orbits TOI-1333.
TOI-1333
- Surface temperature
- 6,274 K (Sun: 5,772 K)
- Mass
- 1.46 M☉
- Radius
- 1.93 R☉
- Luminosity
- 5.1700 L☉
- Age
- 2.3 billion years (Sun: 4.6)
Planetary System
TOI-1333 b is the only planet known to orbit TOI-1333 so far.
TOI-1333 b — Complete Data
| Radius | 15.648 Earth radii (1.396 Jupiter radii) |
|---|---|
| Mass | 753.26 Earth masses (2.370 Jupiter masses) |
| Density | 1.08 g/cm³ (Earth: 5.51) |
| Orbital period | 4.72 days |
| Orbital distance | 0.063 AU |
| Eccentricity | 0.073 |
| Equilibrium temperature | 1,679 K (1,406 °C) |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 653.9 light-years (200.5 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-02-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1333 b
Is TOI-1333 b habitable?
No — TOI-1333 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1333 b?
TOI-1333 b is about 654 light-years from Earth in the constellation Cygnus. 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-1333 b compared to Earth?
TOI-1333 b has 15.65 times the radius of Earth and about 753 times its mass.
How long is a year on TOI-1333 b?
One orbit around TOI-1333 takes 4.7 Earth days — short enough that 77 of its years would fit into one Earth year.
Explore TOI-1333 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.
