KOBE-1 c
KOBE-1 c is a Neptune-like planet orbiting the K7 V star KOBE-1 in the constellation Pisces. It lies about 78 light-years from Earth and was discovered in 2025 using the radial velocity method.
Is KOBE-1 c in the Habitable Zone?
KOBE-1 c orbits inside the inner edge of the habitable zone of KOBE-1. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of KOBE-1: 0.257–0.646 AU (conservative: 0.325–0.612 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 KOBE-1 c
The equilibrium temperature of KOBE-1 c is about 393 K (119 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 3.91 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on KOBE-1 c — one full orbit around KOBE-1 — lasts 29.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.161 AU — closer to its star than Mercury is to the Sun.
How Was KOBE-1 c Discovered?
KOBE-1 c was discovered in 2025 using the radial velocity method, with observations from Calar Alto Observatory.
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 KOBE-1 c?
KOBE-1 c is 78.2 light-years (24.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1948. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,376,320 years to make the journey.
The Host Star: KOBE-1
KOBE-1
- Spectral type
- K7 V
- Surface temperature
- 4,135 K (Sun: 5,772 K)
- Mass
- 0.63 M☉
- Radius
- 0.62 R☉
- Luminosity
- 0.1010 L☉
The KOBE-1 Planetary System
KOBE-1 c is one of 2 known planets in the KOBE-1 system. Its siblings:
- KOBE-1 b (Super Earth)
KOBE-1 c — Complete Data
| Mass (best estimate) | 12.40 Earth masses |
|---|---|
| Orbital period | 29.67 days |
| Orbital distance | 0.161 AU |
| Equilibrium temperature | 393 K (119 °C) |
| Stellar irradiation | 3.91× Earth |
| Distance from Earth | 78.2 light-years (24.0 parsecs) |
| Constellation | Pisces |
| Discovery method | Radial Velocity |
| Discovery facility | Calar Alto Observatory |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-02-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About KOBE-1 c
Is KOBE-1 c habitable?
No — KOBE-1 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is KOBE-1 c?
KOBE-1 c is about 78 light-years from Earth in the constellation Pisces. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,376,320 years to get there.
How long is a year on KOBE-1 c?
One orbit around KOBE-1 takes 29.7 Earth days — short enough that 12 of its years would fit into one Earth year.
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