TOI-1898 b
TOI-1898 b is a cold gas giant orbiting TOI-1898 in the constellation Leo. It lies about 260 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1898 b?
TOI-1898 b has a radius of 9.40 times that of Earth, or 0.84 times the radius of Jupiter. Its mass is 129 times that of Earth, giving it a density of 0.85 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-1898 b in the Habitable Zone?
TOI-1898 b orbits inside the inner edge of the habitable zone of TOI-1898. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1898: 1.376–3.209 AU (conservative: 1.743–3.042 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1898 b
The equilibrium temperature of TOI-1898 b is about 675 K (401 °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-1898 b — one full orbit around TOI-1898 — lasts 45.5 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.269 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.49), swinging dramatically closer to and farther from its star.
How Was TOI-1898 b Discovered?
TOI-1898 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-1898 b?
TOI-1898 b is 259.8 light-years (79.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1767. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,572,480 years to make the journey.
The Host Star: TOI-1898
TOI-1898
- Surface temperature
- 6,241 K (Sun: 5,772 K)
- Mass
- 1.25 M☉
- Radius
- 1.61 R☉
- Luminosity
- 3.5580 L☉
- Age
- 3.1 billion years (Sun: 4.6)
Planetary System
TOI-1898 b is the only planet known to orbit TOI-1898 so far.
TOI-1898 b — Complete Data
| Radius | 9.396 Earth radii (0.838 Jupiter radii) |
|---|---|
| Mass | 129.00 Earth masses (0.406 Jupiter masses) |
| Density | 0.85 g/cm³ (Earth: 5.51) |
| Orbital period | 45.52 days |
| Orbital distance | 0.269 AU |
| Eccentricity | 0.485 |
| Equilibrium temperature | 675 K (401 °C) |
| Distance from Earth | 259.8 light-years (79.7 parsecs) |
| Constellation | Leo |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-07-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1898 b
Is TOI-1898 b habitable?
No — TOI-1898 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1898 b?
TOI-1898 b is about 260 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,572,480 years to get there.
How big is TOI-1898 b compared to Earth?
TOI-1898 b has 9.40 times the radius of Earth and about 129 times its mass.
How long is a year on TOI-1898 b?
One orbit around TOI-1898 takes 45.5 Earth days.
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