TOI-849 b
TOI-849 b is a super-Earth orbiting TOI-849 in the constellation Fornax. It lies about 736 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is TOI-849 b?
TOI-849 b has a radius of 3.64 times that of Earth. Its mass is 41.8 times that of Earth, giving it a density of 5.60 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-849 b in the Habitable Zone?
TOI-849 b orbits inside the inner edge of the habitable zone of TOI-849. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-849: 0.621–1.486 AU (conservative: 0.786–1.409 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-849 b — one full orbit around TOI-849 — lasts just 18.4 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.016 AU — closer to its star than Mercury is to the Sun.
How Was TOI-849 b Discovered?
TOI-849 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-849 b?
TOI-849 b is 736.2 light-years (225.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1290. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,957,120 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-849 b scores 0.19, ranking #3,942 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-849
TOI-849
- Surface temperature
- 5,257 K (Sun: 5,772 K)
- Mass
- 0.97 M☉
- Radius
- 0.97 R☉
Planetary System
TOI-849 b is the only planet known to orbit TOI-849 so far.
TOI-849 b — Complete Data
| Radius | 3.640 Earth radii (0.325 Jupiter radii) |
|---|---|
| Mass | 41.80 Earth masses (0.132 Jupiter masses) |
| Density | 5.60 g/cm³ (Earth: 5.51) |
| Orbital period | 0.77 days |
| Orbital distance | 0.016 AU |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 736.2 light-years (225.7 parsecs) |
| Constellation | Fornax |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2024-07-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-849 b
Is TOI-849 b habitable?
No — TOI-849 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-849 b?
TOI-849 b is about 736 light-years from Earth in the constellation Fornax. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,957,120 years to get there.
How big is TOI-849 b compared to Earth?
TOI-849 b has 3.64 times the radius of Earth and about 41.8 times its mass.
How long is a year on TOI-849 b?
One orbit around TOI-849 takes 0.8 Earth days — short enough that 477 of its years would fit into one Earth year.
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