Key parameters at a glance

A radius of 13.70 Earth radii
A mass of 378.00 Earth masses
Surface gravity around 2.01 g
An orbital period of 2,047.635 days
Semi-major axis 3.2358 AU
Distance from Earth 1,275.39 light-years
Earth Similarity Index 0.323
Travel time at Voyager 1 speed 22,491,570 years

4 siblings around Kepler-139

Kepler-139 e shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-139 d	Super-Earth	1.70	2.00	7.306	972	2023
Kepler-139 b	Sub-Neptune	2.94	7.00	15.771	752	2014
Kepler-139 c	Sub-Neptune	3.38	13.00	157.073	350	2014
Kepler-139 f	Neptune-like	6.67	36.00	355.000	—	2025
Kepler-139 e this	Gas Giant	13.70	378.00	2,047.635	—	2023

Kepler-139 e Planet Profile

Physical Specs

Radius

13.70 R⊕

Radius (Jupiter)

1.220 R♃

Mass

378.00 M⊕

Mass (Jupiter)

1.189 M♃

Density

0.81 g/cm³

Surface Gravity

2.01 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.323

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#554of 1771

top 31.2%

This planet

13.70R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 148164 b 13.70 R⊕ HD 114783 b 13.70 R⊕ HD 159243 b 13.70 R⊕

Metric	Earth	Kepler-139 e	Jupiter
Radius (R⊕)	1.00	13.70	11.21
Mass (M⊕)	1.00	378.00	317.83
Density (g/cm³)	5.51	0.81	1.33
Surface Gravity (g)	1.00	2.01	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	378.000 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	426.116 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 123450224

Gaia DR2

Gaia DR2 2105362903731391744

Gaia DR3

Gaia DR3 2105362903731391744

System

Kepler-139

Percentile among Gas Giant cohort

Radius 13.700 R⊕ · percentile 66 / cohort 1771

Mass 378.000 M⊕ · percentile 40 / cohort 1747

Orbital period 2,047.64 d · percentile 85 / cohort 1533

Distance 391.04 pc · percentile 68 / cohort 1759

ESI 0.323 · percentile 64 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,047.635 days

Semi-major axis

3.2358 AU

Eccentricity

0.013

Inclination

— °

Year Length

A year here lasts about 5.61 Earth years on a nearly circular orbit at a mean orbital distance of 3.2358 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.323

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Weiss et al. 2024

Instrument

HIRES Spectrometer

Publication

2024-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at W. M. Keck Observatory (5 shown).

Kepler-100 e · Neptune-like Kepler-48 f · Gas Giant TOI-1694 c · Gas Giant TOI-1669 b · Gas Giant PZ Tel b · Gas Giant

Host System: Kepler-139

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,622 K — cooler than the Sun (5,778 K)

Estimated Age

5.10 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.045 R☉

Stellar Mass

1.078 M☉

Metallicity [Fe/H]

0.35

Extended Stellar Properties

Surface gravity (log g)

4.345 dex

Stellar density

0.960 g/cm³

Metallicity ratio

[Fe/H]

Distance

391.04 parsec

Light-years 1,275.39 ly

V-band magnitude

12.78 mag

Voyager-speed travel 22,491,570 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.529 mas

Total Proper Motion

17.161 mas/yr

PM Right Ascension

5.40 mas/yr

PM Declination

16.29 mas/yr

Galactic Cartesian (pc)

x = 0.155 · y = -0.704 · z = 0.693

Equatorial (J2000)

RA 282.39195° · Dec 43.88942°

Galactic ℓ, b

73.378° · 18.745°

Ecliptic λ, β

292.678° · 66.356°

HTM-20 index

-675728923