TOI-1130 b
TOI-1130 b is a sub-Neptune orbiting TOI-1130 in the constellation Corona Australis. It lies about 190 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is TOI-1130 b?
TOI-1130 b has a radius of 3.66 times that of Earth. Its mass is 19.8 times that of Earth, giving it a density of 2.23 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1130 b in the Habitable Zone?
TOI-1130 b orbits inside the inner edge of the habitable zone of TOI-1130. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1130: 0.319–0.793 AU (conservative: 0.404–0.752 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1130 b
The equilibrium temperature of TOI-1130 b is about 825 K (552 °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-1130 b — one full orbit around TOI-1130 — lasts 4.07 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.045 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.05).
How Was TOI-1130 b Discovered?
TOI-1130 b was discovered in 2020 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-1130 b?
TOI-1130 b is 190.0 light-years (58.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1836. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,344,000 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. TOI-1130 b scores 0.21, ranking #3,824 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1130
TOI-1130
- Surface temperature
- 4,360 K (Sun: 5,772 K)
- Mass
- 0.75 M☉
- Radius
- 0.70 R☉
- Age
- 5.4 billion years (Sun: 4.6)
The TOI-1130 Planetary System
TOI-1130 b is one of 2 known planets in the TOI-1130 system. Its siblings:
- TOI-1130 c (Hot Jupiter)
TOI-1130 b — Complete Data
| Radius | 3.660 Earth radii (0.327 Jupiter radii) |
|---|---|
| Mass | 19.80 Earth masses (0.062 Jupiter masses) |
| Density | 2.23 g/cm³ (Earth: 5.51) |
| Orbital period | 4.07 days |
| Orbital distance | 0.045 AU |
| Eccentricity | 0.052 |
| Equilibrium temperature | 825 K (552 °C) |
| Earth Similarity Index | 0.21 |
| Distance from Earth | 190.0 light-years (58.3 parsecs) |
| Constellation | Corona Australis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2024-08-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1130 b
Is TOI-1130 b habitable?
No — TOI-1130 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1130 b?
TOI-1130 b is about 190 light-years from Earth in the constellation Corona Australis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,344,000 years to get there.
How big is TOI-1130 b compared to Earth?
TOI-1130 b has 3.66 times the radius of Earth and about 19.8 times its mass.
How long is a year on TOI-1130 b?
One orbit around TOI-1130 takes 4.1 Earth days — short enough that 90 of its years would fit into one Earth year.
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