TOI-6651 b
TOI-6651 b is a Neptune-like planet orbiting TOI-6651 in the constellation Andromeda. It lies about 692 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-6651 b?
TOI-6651 b has a radius of 5.09 times that of Earth. Its mass is 61.0 times that of Earth, giving it a density of 2.52 g/cm³ — between that of rocky and gaseous planets.
Is TOI-6651 b in the Habitable Zone?
TOI-6651 b orbits inside the inner edge of the habitable zone of TOI-6651. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-6651: 1.356–3.182 AU (conservative: 1.718–3.017 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-6651 b
The equilibrium temperature of TOI-6651 b is about 1,493 K (1,220 °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. It receives 817 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-6651 b — one full orbit around TOI-6651 — lasts 5.06 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 0.09).
How Was TOI-6651 b Discovered?
TOI-6651 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-6651 b?
TOI-6651 b is 691.9 light-years (212.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1335. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,177,440 years to make the journey.
The Host Star: TOI-6651
TOI-6651
- Surface temperature
- 5,940 K (Sun: 5,772 K)
- Mass
- 1.32 M☉
- Radius
- 1.72 R☉
- Luminosity
- 3.3300 L☉
- Age
- 3.7 billion years (Sun: 4.6)
Planetary System
TOI-6651 b is the only planet known to orbit TOI-6651 so far.
TOI-6651 b — Complete Data
| Radius | 5.090 Earth radii (0.454 Jupiter radii) |
|---|---|
| Mass | 61.00 Earth masses (0.192 Jupiter masses) |
| Density | 2.52 g/cm³ (Earth: 5.51) |
| Orbital period | 5.06 days |
| Orbital distance | 0.063 AU |
| Eccentricity | 0.091 |
| Equilibrium temperature | 1,493 K (1,220 °C) |
| Stellar irradiation | 817.00× Earth |
| Distance from Earth | 691.9 light-years (212.1 parsecs) |
| Constellation | Andromeda |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-11-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6651 b
Is TOI-6651 b habitable?
No — TOI-6651 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-6651 b?
TOI-6651 b is about 692 light-years from Earth in the constellation Andromeda. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,177,440 years to get there.
How big is TOI-6651 b compared to Earth?
TOI-6651 b has 5.09 times the radius of Earth and about 61.0 times its mass.
How long is a year on TOI-6651 b?
One orbit around TOI-6651 takes 5.1 Earth days — short enough that 72 of its years would fit into one Earth year.
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