HD 164604 c
HD 164604 c is a cold gas giant orbiting the K3.5 V star HD 164604 in the constellation Sagittarius. It lies about 128 light-years from Earth and was discovered in 2026 using the radial velocity method.
Is HD 164604 c in the Habitable Zone?
HD 164604 c orbits beyond the outer edge of the habitable zone of HD 164604. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 164604: 0.405–0.994 AU (conservative: 0.513–0.942 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 164604 c — one full orbit around HD 164604 — lasts 5,387.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 5.556 AU. Its orbit is mildly elliptical (eccentricity 0.20).
How Was HD 164604 c Discovered?
HD 164604 c was discovered in 2026 using the radial velocity method, with observations from Las Campanas 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 164604 c?
HD 164604 c is 128.4 light-years (39.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1898. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,259,840 years to make the journey.
The Host Star: HD 164604
HD 164604
- Spectral type
- K3.5 V
- Surface temperature
- 4,663 K (Sun: 5,772 K)
- Mass
- 0.77 M☉
- Radius
- 0.78 R☉
- Luminosity
- 0.2600 L☉
- Age
- 1.6 billion years (Sun: 4.6)
The HD 164604 Planetary System
HD 164604 c is one of 2 known planets in the HD 164604 system. Its siblings:
HD 164604 c — Complete Data
| Mass | 3,019.37 Earth masses (9.500 Jupiter masses) |
|---|---|
| Orbital period | 5,387.00 days |
| Orbital distance | 5.556 AU |
| Eccentricity | 0.196 |
| Distance from Earth | 128.4 light-years (39.4 parsecs) |
| Constellation | Sagittarius |
| Discovery method | Radial Velocity |
| Discovery facility | Las Campanas Observatory |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-02-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 164604 c
Is HD 164604 c habitable?
No — HD 164604 c orbits outside the habitable zone of HD 164604 and is likely too cold for liquid water on its surface.
How far away is HD 164604 c?
HD 164604 c is about 128 light-years from Earth in the constellation Sagittarius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,259,840 years to get there.
How long is a year on HD 164604 c?
One orbit around HD 164604 takes 5,387.0 Earth days.
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