Key parameters at a glance

A radius of 9.86 Earth radii
A mass of 69.92 Earth masses
Surface gravity around 0.72 g
An orbital period of 33.950 days
Semi-major axis 0.2305 AU
Distance from Earth 3,780.83 light-years
Earth Similarity Index 0.309
Travel time at Voyager 1 speed 66,674,986 years

1 sibling around KOI-134

KOI-134 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
KOI-134 c this	Neptune-like	9.86	69.92	33.950	—	2025
KOI-134 b	Gas Giant	12.04	346.43	67.128	659	2025

KOI-134 c Planet Profile

Physical Specs

Radius

9.86 R⊕

Radius (Jupiter)

0.880 R♃

Mass

69.92 M⊕

Mass (Jupiter)

0.220 M♃

Density

0.40 g/cm³

Surface Gravity

0.72 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.309

HZ Position Unknown

Controversial No

Discovery

Year 2025

Method Transit Timing Variations

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#14of 574

top 2.3%

This planet

9.86R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-5218 b 9.86 R⊕ KMT-2021-BLG-1077L b 9.86 R⊕ TOI-2416 b 9.86 R⊕

Metric	Earth	KOI-134 c	Jupiter
Radius (R⊕)	1.00	9.86	11.21
Mass (M⊕)	1.00	69.92	317.83
Density (g/cm³)	5.51	0.40	1.33
Surface Gravity (g)	1.00	0.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	69.922 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 271772050

Gaia DR2

Gaia DR2 2079971473693847168

Gaia DR3

Gaia DR3 2079971473693847168

System

KOI-134

Percentile among Neptune-like cohort

Radius 9.860 R⊕ · percentile 97 / cohort 574

Mass 69.922 M⊕ · percentile 86 / cohort 574

Orbital period 33.95 d · percentile 62 / cohort 524

Distance 1,159.21 pc · percentile 78 / cohort 572

ESI 0.309 · percentile 52 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

33.950 days

Semi-major axis

0.2305 AU

Eccentricity

0.240

Inclination

75.00 °

Year Length

A year here lasts approximately 33.95 Earth days (9.3% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2305 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.309

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Nabbie 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-725 c · Sub-Neptune Kepler-279 e · Neptune-like KOI-134 b · Gas Giant

Host System: KOI-134

Spectral Class

F-type yellow-white

Effective Temperature

6,160 K — hotter than the Sun (5,778 K)

Estimated Age

2.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.667 R☉

Stellar Mass

1.407 M☉

Metallicity [Fe/H]

0.43

Extended Stellar Properties

Surface gravity (log g)

4.110 dex

Stellar density

1.320 g/cm³

Rotational v·sin i

10.59 km/s

Metallicity ratio

[Fe/H]

Distance

1,159.21 parsec

Light-years 3,780.83 ly

V-band magnitude

13.77 mag

Voyager-speed travel 66,674,986 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.834 mas

Total Proper Motion

6.656 mas/yr

PM Right Ascension

-2.32 mas/yr

PM Declination

-6.24 mas/yr

Galactic Cartesian (pc)

x = 0.303 · y = -0.634 · z = 0.712

Equatorial (J2000)

RA 295.58660° · Dec 45.36494°

Galactic ℓ, b

78.698° · 10.761°

Ecliptic λ, β

315.481° · 64.816°

HTM-20 index

-2018478015