TOI-3568 b
TOI-3568 b is a Neptune-like planet orbiting TOI-3568 in the constellation Cygnus. It lies about 646 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-3568 b?
TOI-3568 b has a radius of 5.30 times that of Earth. Its mass is 26.4 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-3568 b in the Habitable Zone?
TOI-3568 b orbits inside the inner edge of the habitable zone of TOI-3568. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-3568: 1.147–2.777 AU (conservative: 1.453–2.632 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-3568 b
The equilibrium temperature of TOI-3568 b is about 899 K (626 °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-3568 b — one full orbit around TOI-3568 — lasts 4.42 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.049 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.035).
How Was TOI-3568 b Discovered?
TOI-3568 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-3568 b?
TOI-3568 b is 645.5 light-years (197.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1381. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,360,800 years to make the journey.
The Host Star: TOI-3568
TOI-3568
- Surface temperature
- 4,969 K (Sun: 5,772 K)
- Mass
- 0.78 M☉
- Radius
- 0.72 R☉
- Luminosity
- 2.1380 L☉
- Age
- 6.1 billion years (Sun: 4.6)
Planetary System
TOI-3568 b is the only planet known to orbit TOI-3568 so far.
TOI-3568 b — Complete Data
| Radius | 5.300 Earth radii (0.483 Jupiter radii) |
|---|---|
| Mass | 26.40 Earth masses (0.083 Jupiter masses) |
| Density | 0.98 g/cm³ (Earth: 5.51) |
| Orbital period | 4.42 days |
| Orbital distance | 0.049 AU |
| Eccentricity | 0.035 |
| Equilibrium temperature | 899 K (626 °C) |
| Distance from Earth | 645.5 light-years (197.9 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-09-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-3568 b
Is TOI-3568 b habitable?
No — TOI-3568 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-3568 b?
TOI-3568 b is about 646 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,360,800 years to get there.
How big is TOI-3568 b compared to Earth?
TOI-3568 b has 5.30 times the radius of Earth and about 26.4 times its mass.
How long is a year on TOI-3568 b?
One orbit around TOI-3568 takes 4.4 Earth days — short enough that 83 of its years would fit into one Earth year.
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