Key parameters at a glance
- A radius of 12.50 Earth radii
- A mass of 3,019.37 Earth masses
- Surface gravity around 19.32 g
- An orbital period of 5,387.000 days
- Semi-major axis 5.5560 AU
- Distance from Earth 128.39 light-years
- Earth Similarity Index 0.390
- Travel time at Voyager 1 speed 2,264,083 years
1 sibling around HD 164604
HD 164604 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| HD 164604 b | Gas Giant | 12.30 | 4,195.33 | 653.900 | — | 2009 |
| HD 164604 c this | Gas Giant | 12.50 | 3,019.37 | 5,387.000 | — | 2026 |
HD 164604 c Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1235of 1771
top 69.7%
This planet
12.50R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HD 164604 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.50 | 11.21 |
| Mass (M⊕) | 1.00 | 3,019.37 | 317.83 |
| Density (g/cm³) | 5.51 | 8.49 | 1.33 |
| Surface Gravity (g) | 1.00 | 19.32 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3,019.370 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 164604
HIP
HIP 88414
TIC
TIC 406317882
Gaia DR2
Gaia DR2 4062446910648807168
Gaia DR3
Gaia DR3 4062446910648807168
System
HD 164604
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 14.75 Earth years on a mildly elliptical path at a mean orbital distance of 5.5560 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.390
0 = alien, 1 = Earth-identical
Detection Signatures
Radial velocity
Stellar wobble has been measured spectroscopically.
Astrometry
Positional wobble of the host star was measured.
Discovery Paper
Primary reference
Xiao et al. 2026Instrument
Carnegie Planet Finder Spectrograph
Publication
2026-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2026 at Las Campanas Observatory (4 shown).
Host System: HD 164604
Spectral Class
K-type orange
Effective Temperature
4,663 K — cooler than the Sun (5,778 K)
Estimated Age
1.60 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.780 R☉
Stellar Mass
0.770 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.490 dex
Stellar density
2.968 g/cm³
Systemic radial velocity
7.09 km/s
Rotational v·sin i
2.00 km/s
Rotation period
19.00 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
25.376 mas
Total Proper Motion
54.272 mas/yr
PM Right Ascension
-34.76 mas/yr
PM Declination
-41.68 mas/yr
Galactic Cartesian (pc)
x = 0.012 · y = -0.878 · z = -0.478
Equatorial (J2000)
RA 270.77872° · Dec -28.56083°
Galactic ℓ, b
2.263° · -3.119°
Ecliptic λ, β
270.683° · -5.123°
HTM-20 index
-1917347018
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