TOI-2019 b
TOI-2019 b is a Neptune-like planet orbiting TOI-2019 in the constellation Boötes. It lies about 646 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-2019 b?
TOI-2019 b has a radius of 5.33 times that of Earth. Its mass is 34.4 times that of Earth, giving it a density of 1.25 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-2019 b in the Habitable Zone?
TOI-2019 b orbits inside the inner edge of the habitable zone of TOI-2019. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2019: 1.258–2.976 AU (conservative: 1.593–2.822 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 ›
Temperature on TOI-2019 b
The equilibrium temperature of TOI-2019 b is about 917 K (644 °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-2019 b — one full orbit around TOI-2019 — lasts 15.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.128 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2019 b Discovered?
TOI-2019 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-2019 b?
TOI-2019 b is 645.8 light-years (198.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1381. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,366,080 years to make the journey.
The Host Star: TOI-2019
TOI-2019
- Surface temperature
- 5,626 K (Sun: 5,772 K)
- Mass
- 1.18 M☉
- Radius
- 1.75 R☉
- Luminosity
- 2.7590 L☉
- Age
- 6.4 billion years (Sun: 4.6)
Planetary System
TOI-2019 b is the only planet known to orbit TOI-2019 so far.
TOI-2019 b — Complete Data
| Radius | 5.333 Earth radii (0.476 Jupiter radii) |
|---|---|
| Mass | 34.40 Earth masses (0.108 Jupiter masses) |
| Density | 1.25 g/cm³ (Earth: 5.51) |
| Orbital period | 15.34 days |
| Orbital distance | 0.128 AU |
| Equilibrium temperature | 917 K (644 °C) |
| Distance from Earth | 645.8 light-years (198.0 parsecs) |
| Constellation | Boötes |
| 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-2019 b
Is TOI-2019 b habitable?
No — TOI-2019 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2019 b?
TOI-2019 b is about 646 light-years from Earth in the constellation Boötes. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,366,080 years to get there.
How big is TOI-2019 b compared to Earth?
TOI-2019 b has 5.33 times the radius of Earth and about 34.4 times its mass.
How long is a year on TOI-2019 b?
One orbit around TOI-2019 takes 15.3 Earth days — short enough that 24 of its years would fit into one Earth year.
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