TOI-5628 A b
TOI-5628 A b is a hot Jupiter orbiting the M3.0±1.0 star TOI-5628 A in the constellation Coma Berenices. It lies about 359 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-5628 A b?
TOI-5628 A b has a radius of 8.29 times that of Earth, or 0.74 times the radius of Jupiter. Its mass is 28.6 times that of Earth, giving it a density of 0.29 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5628 A b in the Habitable Zone?
TOI-5628 A b orbits inside the inner edge of the habitable zone of TOI-5628 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5628 A: 0.094–0.247 AU (conservative: 0.119–0.234 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5628 A b
The equilibrium temperature of TOI-5628 A b is about 492 K (219 °C) — hotter than anywhere on Earth. 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-5628 A b — one full orbit around TOI-5628 A — lasts 4.34 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.037 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5628 A b Discovered?
TOI-5628 A b was discovered in 2026 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-5628 A b?
TOI-5628 A b is 358.9 light-years (110.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1668. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,316,640 years to make the journey.
The Host Star: TOI-5628 A
TOI-5628 A b belongs to a system of 2 stars; it orbits TOI-5628 A.
TOI-5628 A
- Spectral type
- M3.0±1.0
- Surface temperature
- 3,310 K (Sun: 5,772 K)
- Mass
- 0.36 M☉
- Radius
- 0.35 R☉
Planetary System
TOI-5628 A b is the only planet known to orbit TOI-5628 A so far.
TOI-5628 A b — Complete Data
| Radius | 8.295 Earth radii (0.740 Jupiter radii) |
|---|---|
| Mass | 28.60 Earth masses (0.090 Jupiter masses) |
| Density | 0.29 g/cm³ (Earth: 5.51) |
| Orbital period | 4.34 days |
| Orbital distance | 0.037 AU |
| Equilibrium temperature | 492 K (219 °C) |
| Distance from Earth | 358.9 light-years (110.0 parsecs) |
| Constellation | Coma Berenices |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-08-06. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5628 A b
Is TOI-5628 A b habitable?
No — TOI-5628 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5628 A b?
TOI-5628 A b is about 359 light-years from Earth in the constellation Coma Berenices. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,316,640 years to get there.
How big is TOI-5628 A b compared to Earth?
TOI-5628 A b has 8.29 times the radius of Earth and about 28.6 times its mass.
How long is a year on TOI-5628 A b?
One orbit around TOI-5628 A takes 4.3 Earth days — short enough that 84 of its years would fit into one Earth year.
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