Key parameters at a glance

A radius of 3.87 Earth radii
A mass of 14.30 Earth masses
Surface gravity around 0.95 g
An orbital period of 1,219.000 days
Semi-major axis 1.1370 AU
Equilibrium temperature 56 K (-217 °C)
Distance from Earth 31.09 light-years
Earth Similarity Index 0.134
Travel time at Voyager 1 speed 548,208 years

1 sibling around G 192-15

G 192-15 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
G 192-15 b	Rocky Terrestrial	1.02	1.03	2.275	454	2025
G 192-15 c this	Sub-Neptune	3.87	14.30	1,219.000	56	2025

G 192-15 c Planet Profile

Physical Specs

Radius

3.87 R⊕

Radius (Jupiter)

0.345 R♃

Mass

14.30 M⊕

Mass (Jupiter)

0.045 M♃

Density

1.36 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.134

HZ Position Outer

Controversial No

Discovery

Year 2025

Method Radial Velocity

Facility Calar Alto Observatory

Telescope 3.5 m telescope

Size rank in cohort

Rank by radius

#38of 1978

top 1.9%

This planet

3.87R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-254 b 3.87 R⊕ Kepler-1661 b 3.87 R⊕ HD 51608 c 3.87 R⊕

Metric	Earth	G 192-15 c	Jupiter
Radius (R⊕)	1.00	3.87	11.21
Mass (M⊕)	1.00	14.30	317.83
Density (g/cm³)	5.51	1.36	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	0.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	14.300 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 467119250

Gaia DR2

Gaia DR2 970354749937140736

Gaia DR3

Gaia DR3 970354749937140736

System

G 192-15

Percentile among Sub-Neptune cohort

Radius 3.870 R⊕ · percentile 98 / cohort 1978

Mass 14.300 M⊕ · percentile 91 / cohort 1978

Orbital period 1,219.00 d · percentile 100 / cohort 1946

Distance 9.53 pc · percentile 1 / cohort 1975

ESI 0.134 · percentile 1 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

1,219.000 days

Semi-major axis

1.1370 AU

Eccentricity

0.676

Inclination

— °

Year Length

A year here lasts about 3.34 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.1370 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

4.490 m/s

Transit mid-time (BJD)

2,458,813.0000

Long. of periastron (ω)

73.40°

Angular separation (arcsec)

119.00000

Eq. Temperature

56K

(-217 °C)

Insolation (S⊕)

0.00

Earth = 1.00

Earth Similarity (ESI)

0.134

0 = alien, 1 = Earth-identical

Beyond the outer HZ boundary (too cold) — any water would exist as deep ice.

Discovery Paper

Primary reference

Kaminski et al. 2025

Instrument

CARMENES

Publication

2025-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2025 at Calar Alto Observatory (8 shown).

G 261-6 b · Rocky Terrestrial G 192-15 b · Rocky Terrestrial G 268-110 b · Rocky Terrestrial KOBE-1 c · Sub-Neptune TOI-2093 b · Sub-Neptune KOBE-1 b · Sub-Neptune GJ 9773 b · Gas Giant GJ 508.2 b · Unclassified

Host System: G 192-15

Spectral Class

M-type red dwarf

Effective Temperature

2,999 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.171 R☉

Stellar Mass

0.132 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

5.123 dex

Stellar density

39.962 g/cm³

Rotation period

105.00 days

Distance

9.53 parsec

Light-years 31.09 ly

V-band magnitude

14.64 mag

Voyager-speed travel 548,208 yr

Multi-band Host Photometry — 6 bands

Astrometric Data

Parallax

104.890 mas

Total Proper Motion

852.719 mas/yr

PM Right Ascension

67.22 mas/yr

PM Declination

-850.07 mas/yr

Galactic Cartesian (pc)

x = -0.007 · y = 0.645 · z = 0.764

Equatorial (J2000)

RA 90.62209° · Dec 49.86194°

Galactic ℓ, b

163.238° · 13.120°

Ecliptic λ, β

90.444° · 26.424°

HTM-20 index

-1891385821