TOI-3321 b
TOI-3321 b is a hot Jupiter orbiting TOI-3321 in the constellation Pavo. It lies about 933 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-3321 b?
TOI-3321 b has a radius of 15.56 times that of Earth, or 1.39 times the radius of Jupiter. Its mass is 176 times that of Earth, giving it a density of 0.26 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-3321 b in the Habitable Zone?
TOI-3321 b orbits inside the inner edge of the habitable zone of TOI-3321. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-3321: 1.191–2.800 AU (conservative: 1.508–2.655 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-3321 b
The equilibrium temperature of TOI-3321 b is about 1,616 K (1,343 °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-3321 b — one full orbit around TOI-3321 — lasts 3.65 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.047 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.05).
How Was TOI-3321 b Discovered?
TOI-3321 b was discovered in 2024 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-3321 b?
TOI-3321 b is 932.5 light-years (285.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1094. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 16,412,000 years to make the journey.
The Host Star: TOI-3321
TOI-3321
- Surface temperature
- 5,850 K (Sun: 5,772 K)
- Mass
- 1.04 M☉
- Radius
- 1.55 R☉
- Luminosity
- 2.5400 L☉
- Age
- 8.1 billion years (Sun: 4.6)
Planetary System
TOI-3321 b is the only planet known to orbit TOI-3321 so far.
TOI-3321 b — Complete Data
| Radius | 15.558 Earth radii (1.388 Jupiter radii) |
|---|---|
| Mass | 176.08 Earth masses (0.554 Jupiter masses) |
| Density | 0.26 g/cm³ (Earth: 5.51) |
| Orbital period | 3.65 days |
| Orbital distance | 0.047 AU |
| Eccentricity | 0.054 |
| Equilibrium temperature | 1,616 K (1,343 °C) |
| Distance from Earth | 932.5 light-years (285.9 parsecs) |
| Constellation | Pavo |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-07-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-3321 b
Is TOI-3321 b habitable?
No — TOI-3321 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-3321 b?
TOI-3321 b is about 933 light-years from Earth in the constellation Pavo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 16,412,000 years to get there.
How big is TOI-3321 b compared to Earth?
TOI-3321 b has 15.56 times the radius of Earth and about 176 times its mass.
How long is a year on TOI-3321 b?
One orbit around TOI-3321 takes 3.7 Earth days — short enough that 100 of its years would fit into one Earth year.
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