TOI-6628 b
TOI-6628 b is a cold gas giant orbiting TOI-6628 in the constellation Lupus. It lies about 1,045 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-6628 b?
TOI-6628 b has a radius of 10.98 times that of Earth, or 0.98 times the radius of Jupiter. Its mass is 235 times that of Earth, giving it a density of 0.98 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-6628 b in the Habitable Zone?
TOI-6628 b orbits inside the inner edge of the habitable zone of TOI-6628. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-6628: 0.691–1.643 AU (conservative: 0.875–1.558 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-6628 b
The equilibrium temperature of TOI-6628 b is about 833 K (560 °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-6628 b — one full orbit around TOI-6628 — lasts 18.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.134 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.67), swinging dramatically closer to and farther from its star.
How Was TOI-6628 b Discovered?
TOI-6628 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-6628 b?
TOI-6628 b is 1,045.4 light-years (320.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,045 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,399,040 years to make the journey.
The Host Star: TOI-6628
TOI-6628
- Surface temperature
- 5,463 K (Sun: 5,772 K)
- Mass
- 0.97 M☉
- Radius
- 1.01 R☉
- Luminosity
- 0.8170 L☉
- Age
- 7.5 billion years (Sun: 4.6)
Planetary System
TOI-6628 b is the only planet known to orbit TOI-6628 so far.
TOI-6628 b — Complete Data
| Radius | 10.985 Earth radii (0.980 Jupiter radii) |
|---|---|
| Mass | 235.19 Earth masses (0.740 Jupiter masses) |
| Density | 0.98 g/cm³ (Earth: 5.51) |
| Orbital period | 18.18 days |
| Orbital distance | 0.134 AU |
| Eccentricity | 0.670 |
| Equilibrium temperature | 833 K (560 °C) |
| Distance from Earth | 1,045.4 light-years (320.5 parsecs) |
| Constellation | Lupus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-03-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6628 b
Is TOI-6628 b habitable?
No — TOI-6628 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-6628 b?
TOI-6628 b is about 1,045 light-years from Earth in the constellation Lupus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,399,040 years to get there.
How big is TOI-6628 b compared to Earth?
TOI-6628 b has 10.98 times the radius of Earth and about 235 times its mass.
How long is a year on TOI-6628 b?
One orbit around TOI-6628 takes 18.2 Earth days — short enough that 20 of its years would fit into one Earth year.
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