TOI-1853 b
TOI-1853 b is a super-Earth orbiting the K2.5 V star TOI-1853 in the constellation Boötes. It lies about 539 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-1853 b?
TOI-1853 b has a radius of 3.46 times that of Earth. Its mass is 73.2 times that of Earth, giving it a density of 9.74 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-1853 b in the Habitable Zone?
TOI-1853 b orbits inside the inner edge of the habitable zone of TOI-1853. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1853: 0.477–1.153 AU (conservative: 0.604–1.093 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1853 b
The equilibrium temperature of TOI-1853 b is about 1,479 K (1,206 °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-1853 b — one full orbit around TOI-1853 — lasts just 29.8 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.021 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.030).
How Was TOI-1853 b Discovered?
TOI-1853 b was discovered in 2023 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-1853 b?
TOI-1853 b is 538.5 light-years (165.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1488. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,477,600 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-1853 b scores 0.19, ranking #3,938 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-1853
TOI-1853
- Spectral type
- K2.5 V
- Surface temperature
- 4,985 K (Sun: 5,772 K)
- Mass
- 0.84 M☉
- Radius
- 0.81 R☉
- Luminosity
- 0.3696 L☉
Planetary System
TOI-1853 b is the only planet known to orbit TOI-1853 so far.
TOI-1853 b — Complete Data
| Radius | 3.460 Earth radii (0.309 Jupiter radii) |
|---|---|
| Mass | 73.20 Earth masses (0.230 Jupiter masses) |
| Density | 9.74 g/cm³ (Earth: 5.51) |
| Orbital period | 1.24 days |
| Orbital distance | 0.021 AU |
| Eccentricity | 0.030 |
| Equilibrium temperature | 1,479 K (1,206 °C) |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 538.5 light-years (165.1 parsecs) |
| Constellation | Boötes |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-09-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1853 b
Is TOI-1853 b habitable?
No — TOI-1853 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1853 b?
TOI-1853 b is about 539 light-years from Earth in the constellation Boötes. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,477,600 years to get there.
How big is TOI-1853 b compared to Earth?
TOI-1853 b has 3.46 times the radius of Earth and about 73.2 times its mass.
How long is a year on TOI-1853 b?
One orbit around TOI-1853 takes 1.2 Earth days — short enough that 294 of its years would fit into one Earth year.
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