Key parameters at a glance

A radius of 3.21 Earth radii
A mass of 10.40 Earth masses
Surface gravity around 1.01 g
An orbital period of 4.601 days
Distance from Earth 130.25 light-years
Earth Similarity Index 0.617
Travel time at Voyager 1 speed 2,296,943 years

1 sibling around HD 196067

HD 196067 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 196067 c this	Sub-Neptune	3.21	10.40	4.601	—	2025
HD 196067 b	Gas Giant	12.40	3,623.24	3,413.700	—	2012

HD 196067 c Planet Profile

Physical Specs

Radius

3.21 R⊕

Radius (Jupiter)

0.286 R♃

Mass

10.40 M⊕

Mass (Jupiter)

0.033 M♃

Density

1.73 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.617

HZ Position Unknown

Controversial No

Discovery

Year 2025

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#339of 1978

top 17.1%

This planet

3.21R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-782 b 3.21 R⊕ TOI-4155 b 3.21 R⊕ MOA-2009-BLG-266L b 3.21 R⊕

Metric	Earth	HD 196067 c	Jupiter
Radius (R⊕)	1.00	3.21	11.21
Mass (M⊕)	1.00	10.40	317.83
Density (g/cm³)	5.51	1.73	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	10.400 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 196067

HIP

HIP 102125

TIC

TIC 327303574

Gaia DR2

Gaia DR2 6369544118965772416

Gaia DR3

Gaia DR3 6369544118965772416

System

HD 196067

Percentile among Sub-Neptune cohort

Radius 3.210 R⊕ · percentile 83 / cohort 1978

Mass 10.400 M⊕ · percentile 76 / cohort 1978

Orbital period 4.60 d · percentile 11 / cohort 1946

Distance 39.93 pc · percentile 10 / cohort 1975

ESI 0.617 · percentile 84 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

4.601 days

Semi-major axis

— AU

Eccentricity

0.235

Inclination

— °

Year Length

A year here lasts approximately 4.60 Earth days (1.3% of a terrestrial year) on a mildly elliptical path.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.617

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Delisle et al. 2025

Instrument

HARPS Spectrograph

Publication

2025-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2025 at La Silla Observatory (12 shown).

Proxima Cen d · Rocky Terrestrial TOI-1203 c · Sub-Neptune HD 23079 c · Sub-Neptune HD 87816 b · Gas Giant HD 102888 b · Gas Giant HD 94890 c · Gas Giant TOI-756 c · Gas Giant TOI-1203 e · Neptune-like HD 94890 b · Gas Giant HD 87816 c · Gas Giant GJ 2126 b · Gas Giant HD 28471 d · Sub-Neptune

Host System: HD 196067

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,072 K — hotter than the Sun (5,778 K)

Estimated Age

4.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.710 R☉

Stellar Mass

1.160 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

4.090 dex

Stellar density

0.313 g/cm³

Systemic radial velocity

-10.95 km/s

Rotational v·sin i

1.45 km/s

Rotation period

22.50 days

Activity index (log R'HK)

-5.033

Metallicity ratio

[Fe/H]

Distance

39.93 parsec

Light-years 130.25 ly

V-band magnitude

6.51 mag

Voyager-speed travel 2,296,943 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

25.012 mas

Total Proper Motion

225.371 mas/yr

PM Right Ascension

156.60 mas/yr

PM Declination

-162.08 mas/yr

Galactic Cartesian (pc)

x = 0.164 · y = -0.192 · z = -0.967

Equatorial (J2000)

RA 310.43642° · Dec -75.35150°

Galactic ℓ, b

318.443° · -33.049°

Ecliptic λ, β

286.282° · -54.203°

HTM-20 index

522645378