TOI-2158 c
TOI-2158 c is a cold gas giant orbiting TOI-2158 in the constellation Hercules. It lies about 647 light-years from Earth and was discovered in 2026 using the radial velocity method.
Is TOI-2158 c in the Habitable Zone?
The position of TOI-2158 c relative to the habitable zone of TOI-2158 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-2158: 0.961–2.270 AU (conservative: 1.217–2.153 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 ›
Orbit and Year Length
A year on TOI-2158 c — one full orbit around TOI-2158 — lasts 414.5 Earth days, longer than an Earth year. Its orbit is highly elliptical (eccentricity 0.54), swinging dramatically closer to and farther from its star.
How Was TOI-2158 c Discovered?
TOI-2158 c was discovered in 2026 using the radial velocity method, with observations from Multiple Facilities.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is TOI-2158 c?
TOI-2158 c is 647.3 light-years (198.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1379. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,392,480 years to make the journey.
The Host Star: TOI-2158
TOI-2158
- Surface temperature
- 5,673 K (Sun: 5,772 K)
- Mass
- 1.12 M☉
- Radius
- 1.32 R☉
- Age
- 7.7 billion years (Sun: 4.6)
The TOI-2158 Planetary System
TOI-2158 c is one of 2 known planets in the TOI-2158 system. Its siblings:
- TOI-2158 b (Hot Jupiter)
TOI-2158 c — Complete Data
| Mass (best estimate) | 514.88 Earth masses |
|---|---|
| Orbital period | 414.50 days |
| Eccentricity | 0.540 |
| Distance from Earth | 647.3 light-years (198.5 parsecs) |
| Constellation | Hercules |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Facilities |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-10-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2158 c
Is TOI-2158 c habitable?
TOI-2158 c is not known to orbit within the habitable zone of TOI-2158, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is TOI-2158 c?
TOI-2158 c is about 647 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,392,480 years to get there.
How long is a year on TOI-2158 c?
One orbit around TOI-2158 takes 414.5 Earth days.
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