TOI-1135 b
TOI-1135 b is a hot Jupiter orbiting TOI-1135 in the constellation Camelopardalis. It lies about 372 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1135 b?
TOI-1135 b has a radius of 9.92 times that of Earth, or 0.89 times the radius of Jupiter. Its mass is 58.8 times that of Earth, giving it a density of 0.15 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1135 b in the Habitable Zone?
TOI-1135 b orbits inside the inner edge of the habitable zone of TOI-1135. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1135: 1.047–2.438 AU (conservative: 1.327–2.312 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1135 b
The equilibrium temperature of TOI-1135 b is about 1,171 K (898 °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 310 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1135 b — one full orbit around TOI-1135 — lasts 8.03 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.082 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-1135 b Discovered?
TOI-1135 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-1135 b?
TOI-1135 b is 372.0 light-years (114.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1654. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,547,200 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-1135 b scores 0.10, ranking #4,444 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1135
TOI-1135
- Surface temperature
- 6,320 K (Sun: 5,772 K)
- Mass
- 1.12 M☉
- Radius
- 1.20 R☉
- Luminosity
- 2.0800 L☉
- Age
- 3.3 billion years (Sun: 4.6)
Planetary System
TOI-1135 b is the only planet known to orbit TOI-1135 so far.
TOI-1135 b — Complete Data
| Radius | 9.920 Earth radii (0.885 Jupiter radii) |
|---|---|
| Mass | 58.80 Earth masses (0.185 Jupiter masses) |
| Density | 0.15 g/cm³ (Earth: 5.51) |
| Orbital period | 8.03 days |
| Orbital distance | 0.082 AU |
| Eccentricity | 0.062 |
| Equilibrium temperature | 1,171 K (898 °C) |
| Stellar irradiation | 310.00× Earth |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 372.0 light-years (114.0 parsecs) |
| Constellation | Camelopardalis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2026-03-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1135 b
Is TOI-1135 b habitable?
No — TOI-1135 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1135 b?
TOI-1135 b is about 372 light-years from Earth in the constellation Camelopardalis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,547,200 years to get there.
How big is TOI-1135 b compared to Earth?
TOI-1135 b has 9.92 times the radius of Earth and about 58.8 times its mass.
How long is a year on TOI-1135 b?
One orbit around TOI-1135 takes 8.0 Earth days — short enough that 45 of its years would fit into one Earth year.
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