Key parameters at a glance

A radius of 3.08 Earth radii
A mass of 9.70 Earth masses
Surface gravity around 1.02 g
An orbital period of 207.541 days
Semi-major axis 0.6744 AU
Equilibrium temperature 268 K (-5 °C)
Distance from Earth 2,473.79 light-years
Earth Similarity Index 0.672
Travel time at Voyager 1 speed 43,625,322 years

1 sibling around Kepler-725

Kepler-725 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
Kepler-725 b	Gas Giant	10.80	81.60	39.644	514	2016
Kepler-725 c this	Sub-Neptune	3.08	9.70	207.541	268	2025

Kepler-725 c Planet Profile

Physical Specs

Radius

3.08 R⊕

Radius (Jupiter)

0.275 R♃

Mass

9.70 M⊕

Mass (Jupiter)

0.031 M♃

Density

1.82 g/cm³

Surface Gravity

1.02 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.672

HZ Position Habitable

Controversial No

Discovery

Year 2025

Method Transit Timing Variations

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#448of 1978

top 22.6%

This planet

3.08R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-941 b 3.08 R⊕ Kepler-681 b 3.08 R⊕ Kepler-232 b 3.08 R⊕

Metric	Earth	Kepler-725 c	Jupiter
Radius (R⊕)	1.00	3.08	11.21
Mass (M⊕)	1.00	9.70	317.83
Density (g/cm³)	5.51	1.82	1.33
Surface Gravity (g)	1.00	1.02	2.53
Insolation (S⊕)	1.00	1.40	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.700 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 164652841

Gaia DR2

Gaia DR2 2106775024555031936

Gaia DR3

Gaia DR3 2106775024555031936

System

Kepler-725

Percentile among Sub-Neptune cohort

Radius 3.080 R⊕ · percentile 77 / cohort 1978

Mass 9.700 M⊕ · percentile 71 / cohort 1978

Orbital period 207.54 d · percentile 98 / cohort 1946

Distance 758.47 pc · percentile 62 / cohort 1975

ESI 0.672 · percentile 90 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

207.541 days

Semi-major axis

0.6744 AU

Eccentricity

0.436

Inclination

— °

Year Length

A year here lasts approximately 207.54 Earth days (56.8% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.6744 AU.

Eq. Temperature

268K

(-5 °C)

Insolation (S⊕)

1.40

Earth = 1.00

Earth Similarity (ESI)

0.672

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — surface water would be frozen.

Discovery Paper

Primary reference

Sun et al. 2025

Instrument

Kepler CCD Array

Publication

2025-06

Observation locale

Space

Discovery cohort

Planets confirmed in 2025 at Kepler (4 shown).

Kepler-289 e · Sub-Neptune Kepler-279 e · Neptune-like KOI-134 c · Neptune-like KOI-134 b · Gas Giant

Host System: Kepler-725

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,395 K — cooler than the Sun (5,778 K)

Estimated Age

1.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.880 R☉

Stellar Mass

0.950 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

1.974 g/cm³

Rotation period

17.46 days

Metallicity ratio

[Fe/H]

Distance

758.47 parsec

Light-years 2,473.79 ly

V-band magnitude

15.15 mag

Voyager-speed travel 43,625,322 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.290 mas

Total Proper Motion

5.046 mas/yr

PM Right Ascension

-0.62 mas/yr

PM Declination

5.01 mas/yr

Galactic Cartesian (pc)

x = 0.171 · y = -0.688 · z = 0.705

Equatorial (J2000)

RA 283.97749° · Dec 44.81156°

Galactic ℓ, b

74.704° · 18.002°

Ecliptic λ, β

296.000° · 66.993°

HTM-20 index

471983937