TOI-519 b
TOI-519 b is a hot Jupiter orbiting the M V star TOI-519 in the constellation Puppis. It lies about 377 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-519 b?
TOI-519 b has a radius of 11.55 times that of Earth, or 1.03 times the radius of Jupiter. Its mass is 147 times that of Earth, giving it a density of 0.56 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-519 b in the Habitable Zone?
TOI-519 b orbits inside the inner edge of the habitable zone of TOI-519. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-519: 0.097–0.255 AU (conservative: 0.123–0.242 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-519 b
The equilibrium temperature of TOI-519 b is about 687 K (414 °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-519 b — one full orbit around TOI-519 — lasts just 30.4 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. Its orbit is highly elliptical (eccentricity 0.33), swinging dramatically closer to and farther from its star.
How Was TOI-519 b Discovered?
TOI-519 b was discovered in 2021 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-519 b?
TOI-519 b is 376.9 light-years (115.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1650. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,633,440 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-519 b scores 0.09, ranking #4,484 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-519
TOI-519
- Spectral type
- M V
- Surface temperature
- 3,322 K (Sun: 5,772 K)
- Mass
- 0.34 M☉
- Radius
- 0.35 R☉
- Luminosity
- 0.0141 L☉
- Age
- 5.4 billion years (Sun: 4.6)
Planetary System
TOI-519 b is the only planet known to orbit TOI-519 so far.
TOI-519 b — Complete Data
| Radius | 11.545 Earth radii (1.030 Jupiter radii) |
|---|---|
| Mass | 147.15 Earth masses (0.463 Jupiter masses) |
| Density | 0.56 g/cm³ (Earth: 5.51) |
| Orbital period | 1.27 days |
| Orbital distance | 0.016 AU |
| Eccentricity | 0.330 |
| Equilibrium temperature | 687 K (414 °C) |
| Earth Similarity Index | 0.09 |
| Distance from Earth | 376.9 light-years (115.6 parsecs) |
| Constellation | Puppis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2023-05-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-519 b
Is TOI-519 b habitable?
No — TOI-519 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-519 b?
TOI-519 b is about 377 light-years from Earth in the constellation Puppis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,633,440 years to get there.
How big is TOI-519 b compared to Earth?
TOI-519 b has 11.55 times the radius of Earth and about 147 times its mass.
How long is a year on TOI-519 b?
One orbit around TOI-519 takes 1.3 Earth days — short enough that 289 of its years would fit into one Earth year.
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