TOI-4773 b
TOI-4773 b is a hot Jupiter orbiting TOI-4773 in the constellation Puppis. It lies about 1,608 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-4773 b?
TOI-4773 b has a radius of 15.22 times that of Earth, or 1.36 times the radius of Jupiter. Its mass is 1,688 times that of Earth, giving it a density of 2.63 g/cm³ — between that of rocky and gaseous planets.
Is TOI-4773 b in the Habitable Zone?
TOI-4773 b orbits inside the inner edge of the habitable zone of TOI-4773. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4773: 1.495–3.460 AU (conservative: 1.894–3.281 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-4773 b
The equilibrium temperature of TOI-4773 b is about 2,255 K (1,982 °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-4773 b — one full orbit around TOI-4773 — lasts just 41.9 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.032 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.024).
How Was TOI-4773 b Discovered?
TOI-4773 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-4773 b?
TOI-4773 b is 1,607.6 light-years (492.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,608 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 28,293,760 years to make the journey.
The Host Star: TOI-4773
TOI-4773
- Surface temperature
- 6,740 K (Sun: 5,772 K)
- Mass
- 1.45 M☉
- Radius
- 1.55 R☉
- Luminosity
- 4.4500 L☉
- Age
- 1.1 billion years (Sun: 4.6)
Planetary System
TOI-4773 b is the only planet known to orbit TOI-4773 so far.
TOI-4773 b — Complete Data
| Radius | 15.222 Earth radii (1.358 Jupiter radii) |
|---|---|
| Mass | 1,687.67 Earth masses (5.310 Jupiter masses) |
| Density | 2.63 g/cm³ (Earth: 5.51) |
| Orbital period | 1.75 days |
| Orbital distance | 0.032 AU |
| Eccentricity | 0.024 |
| Equilibrium temperature | 2,255 K (1,982 °C) |
| Distance from Earth | 1,607.6 light-years (492.9 parsecs) |
| Constellation | Puppis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-09-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4773 b
Is TOI-4773 b habitable?
No — TOI-4773 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4773 b?
TOI-4773 b is about 1,608 light-years from Earth in the constellation Puppis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 28,293,760 years to get there.
How big is TOI-4773 b compared to Earth?
TOI-4773 b has 15.22 times the radius of Earth and about 1,688 times its mass.
How long is a year on TOI-4773 b?
One orbit around TOI-4773 takes 1.7 Earth days — short enough that 209 of its years would fit into one Earth year.
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