HD 190360 c
HD 190360 c is a Neptune-like planet orbiting the G star HD 190360 in the constellation Cygnus. It lies about 52 light-years from Earth and was discovered in 2005 using the radial velocity method.
Is HD 190360 c in the Habitable Zone?
The position of HD 190360 c relative to the habitable zone of HD 190360 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 190360 c — one full orbit around HD 190360 — lasts 17.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.130 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.17).
How Was HD 190360 c Discovered?
HD 190360 c was discovered in 2005 using the radial velocity method, with observations from W. M. Keck 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 HD 190360 c?
HD 190360 c is 52.2 light-years (16.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1974. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 918,720 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. HD 190360 c scores 0.18, ranking #4,062 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 190360
HD 190360 c belongs to a system of 2 stars; it orbits HD 190360.
HD 190360
- Spectral type
- G
- Mass
- 0.99 M☉
- Radius
- 1.20 R☉
- Age
- 11.3 billion years (Sun: 4.6)
The HD 190360 Planetary System
HD 190360 c is one of 2 known planets in the HD 190360 system. Its siblings:
- HD 190360 b (Cold Gas Giant)
HD 190360 c — Complete Data
| Mass | 25.43 Earth masses (0.080 Jupiter masses) |
|---|---|
| Orbital period | 17.12 days |
| Orbital distance | 0.130 AU |
| Eccentricity | 0.165 |
| Earth Similarity Index | 0.18 |
| Distance from Earth | 52.2 light-years (16.0 parsecs) |
| Constellation | Cygnus |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2005 |
Data: NASA Exoplanet Archive, last updated 2026-03-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 190360 c
Is HD 190360 c habitable?
HD 190360 c is not known to orbit within the habitable zone of HD 190360, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is HD 190360 c?
HD 190360 c is about 52 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 918,720 years to get there.
How long is a year on HD 190360 c?
One orbit around HD 190360 takes 17.1 Earth days — short enough that 21 of its years would fit into one Earth year.
Explore HD 190360 c in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
