TOI-1839 c
TOI-1839 c is a mini-Neptune orbiting the G9 V star TOI-1839 in the constellation Virgo. It lies about 379 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-1839 c?
TOI-1839 c has a radius of 2.50 times that of Earth. Its mass is 6.0 times that of Earth, giving it a density of 2.11 g/cm³ — between that of rocky and gaseous planets.
Is TOI-1839 c in the Habitable Zone?
TOI-1839 c orbits inside the inner edge of the habitable zone of TOI-1839. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1839: 0.568–1.355 AU (conservative: 0.719–1.285 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1839 c
The equilibrium temperature of TOI-1839 c is about 1,121 K (848 °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 263 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1839 c — one full orbit around TOI-1839 — lasts 4.02 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.047 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1839 c Discovered?
TOI-1839 c was discovered in 2026 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-1839 c?
TOI-1839 c is 378.6 light-years (116.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1648. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,663,360 years to make the journey.
The Host Star: TOI-1839
TOI-1839
- Spectral type
- G9 V
- Surface temperature
- 5,347 K (Sun: 5,772 K)
- Mass
- 0.86 M☉
- Radius
- 0.89 R☉
- Luminosity
- 0.5445 L☉
- Age
- 4.1 billion years (Sun: 4.6)
The TOI-1839 Planetary System
TOI-1839 c is one of 2 known planets in the TOI-1839 system. Its siblings:
- TOI-1839 b (Super Earth)
TOI-1839 c — Complete Data
| Radius | 2.500 Earth radii (0.223 Jupiter radii) |
|---|---|
| Mass | 6.00 Earth masses (0.019 Jupiter masses) |
| Density | 2.11 g/cm³ (Earth: 5.51) |
| Orbital period | 4.02 days |
| Orbital distance | 0.047 AU |
| Equilibrium temperature | 1,121 K (848 °C) |
| Stellar irradiation | 263.00× Earth |
| Distance from Earth | 378.6 light-years (116.1 parsecs) |
| Constellation | Virgo |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-09-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1839 c
Is TOI-1839 c habitable?
No — TOI-1839 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1839 c?
TOI-1839 c is about 379 light-years from Earth in the constellation Virgo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,663,360 years to get there.
How big is TOI-1839 c compared to Earth?
TOI-1839 c has 2.50 times the radius of Earth and about 6.0 times its mass.
How long is a year on TOI-1839 c?
One orbit around TOI-1839 takes 4.0 Earth days — short enough that 91 of its years would fit into one Earth year.
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