TOI-1181 b
TOI-1181 b is a hot Jupiter orbiting TOI-1181 in the constellation Draco. It lies about 988 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-1181 b?
TOI-1181 b has a radius of 17.03 times that of Earth, or 1.52 times the radius of Jupiter. Its mass is 375 times that of Earth.
Is TOI-1181 b in the Habitable Zone?
The position of TOI-1181 b relative to the habitable zone of TOI-1181 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1181: 1.546–3.619 AU (conservative: 1.958–3.431 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on TOI-1181 b — one full orbit around TOI-1181 — lasts 2.10 Earth days, shorter than Mercury's 88-day year. Its orbit is nearly circular (eccentricity 0.011).
How Was TOI-1181 b Discovered?
TOI-1181 b was discovered in 2022 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-1181 b?
TOI-1181 b is 987.7 light-years (302.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1039. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 17,383,520 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-1181 b scores 0.06, ranking #5,116 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1181
TOI-1181
- Surface temperature
- 6,054 K (Sun: 5,772 K)
- Mass
- 1.47 M☉
- Radius
- 1.96 R☉
- Luminosity
- 4.3900 L☉
- Age
- 2.7 billion years (Sun: 4.6)
Planetary System
TOI-1181 b is the only planet known to orbit TOI-1181 so far.
TOI-1181 b — Complete Data
| Radius | 17.026 Earth radii (1.519 Jupiter radii) |
|---|---|
| Mass | 374.72 Earth masses (1.179 Jupiter masses) |
| Orbital period | 2.10 days |
| Eccentricity | 0.011 |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 987.7 light-years (302.8 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2024-08-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1181 b
Is TOI-1181 b habitable?
TOI-1181 b is not known to orbit within the habitable zone of TOI-1181, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is TOI-1181 b?
TOI-1181 b is about 988 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 17,383,520 years to get there.
How big is TOI-1181 b compared to Earth?
TOI-1181 b has 17.03 times the radius of Earth and about 375 times its mass.
How long is a year on TOI-1181 b?
One orbit around TOI-1181 takes 2.1 Earth days — short enough that 174 of its years would fit into one Earth year.
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