TOI-615 b
TOI-615 b is a hot Jupiter orbiting the F2 V star TOI-615 in the constellation Vela. It lies about 1,176 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-615 b?
TOI-615 b has a radius of 18.98 times that of Earth, or 1.69 times the radius of Jupiter. Its mass is 138 times that of Earth, giving it a density of 0.08 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-615 b in the Habitable Zone?
TOI-615 b orbits inside the inner edge of the habitable zone of TOI-615. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-615: 1.706–3.943 AU (conservative: 2.161–3.738 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-615 b
The equilibrium temperature of TOI-615 b is about 1,666 K (1,393 °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. It receives 1,286 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-615 b — one full orbit around TOI-615 — lasts 4.66 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.068 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.39), swinging dramatically closer to and farther from its star.
How Was TOI-615 b Discovered?
TOI-615 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-615 b?
TOI-615 b is 1,175.5 light-years (360.4 parsecs) from Earth. Light arriving here tonight left the planet about 1,176 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 20,688,800 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-615 b scores 0.05, ranking #5,286 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-615
TOI-615
- Spectral type
- F2 V
- Surface temperature
- 6,850 K (Sun: 5,772 K)
- Mass
- 1.45 M☉
- Radius
- 1.73 R☉
- Luminosity
- 5.8600 L☉
- Age
- 1.7 billion years (Sun: 4.6)
Planetary System
TOI-615 b is the only planet known to orbit TOI-615 so far.
TOI-615 b — Complete Data
| Radius | 18.977 Earth radii (1.693 Jupiter radii) |
|---|---|
| Mass | 138.26 Earth masses (0.435 Jupiter masses) |
| Density | 0.08 g/cm³ (Earth: 5.51) |
| Orbital period | 4.66 days |
| Orbital distance | 0.068 AU |
| Eccentricity | 0.390 |
| Equilibrium temperature | 1,666 K (1,393 °C) |
| Stellar irradiation | 1,286.00× Earth |
| Earth Similarity Index | 0.05 |
| Distance from Earth | 1,175.5 light-years (360.4 parsecs) |
| Constellation | Vela |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-07-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-615 b
Is TOI-615 b habitable?
No — TOI-615 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-615 b?
TOI-615 b is about 1,176 light-years from Earth in the constellation Vela. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 20,688,800 years to get there.
How big is TOI-615 b compared to Earth?
TOI-615 b has 18.98 times the radius of Earth and about 138 times its mass.
How long is a year on TOI-615 b?
One orbit around TOI-615 takes 4.7 Earth days — short enough that 78 of its years would fit into one Earth year.
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