Key parameters at a glance

A radius of 5.27 Earth radii
A mass of 24.14 Earth masses
Surface gravity around 0.87 g
An orbital period of 60.889 days
Semi-major axis 0.3124 AU
Distance from Earth 993.62 light-years
Earth Similarity Index 0.461
Travel time at Voyager 1 speed 17,522,452 years

3 siblings around Kepler-100

Kepler-100 e shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-100 b	Super-Earth	1.34	4.01	6.887	1,155	2014
Kepler-100 c	Sub-Neptune	2.20	7.05	12.816	939	2014
Kepler-100 d	Super-Earth	1.61	3.00	35.333	670	2014
Kepler-100 e this	Neptune-like	5.27	24.14	60.889	—	2023

Kepler-100 e Planet Profile

Physical Specs

Radius

5.27 R⊕

Radius (Jupiter)

0.470 R♃

Mass

24.14 M⊕

Mass (Jupiter)

0.076 M♃

Density

0.91 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.461

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

#346of 574

top 60.1%

This planet

5.27R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 109271 c 5.27 R⊕ HD 192310 c 5.25 R⊕ TOI-674 b 5.25 R⊕

Metric	Earth	Kepler-100 e	Jupiter
Radius (R⊕)	1.00	5.27	11.21
Mass (M⊕)	1.00	24.14	317.83
Density (g/cm³)	5.51	0.91	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	24.143 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 159654016

Gaia DR2

Gaia DR2 2101733244046205568

Gaia DR3

Gaia DR3 2101733244046205568

System

Kepler-100

Percentile among Neptune-like cohort

Radius 5.270 R⊕ · percentile 40 / cohort 574

Mass 24.143 M⊕ · percentile 41 / cohort 574

Orbital period 60.89 d · percentile 74 / cohort 524

Distance 304.65 pc · percentile 47 / cohort 572

ESI 0.461 · percentile 83 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

60.889 days

Semi-major axis

0.3124 AU

Eccentricity

0.026

Inclination

— °

Year Length

A year here lasts approximately 60.89 Earth days (16.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3124 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.461

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-139 e · Gas Giant Kepler-48 f · Gas Giant TOI-1694 c · Gas Giant TOI-1669 b · Gas Giant PZ Tel b · Gas Giant

Host System: Kepler-100

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,884 K — hotter than the Sun (5,778 K)

Estimated Age

6.92 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.500 R☉

Stellar Mass

1.097 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.120 dex

Stellar density

0.440 g/cm³

Systemic radial velocity

-60.44 km/s

Rotational v·sin i

3.70 km/s

Metallicity ratio

[Fe/H]

Distance

304.65 parsec

Light-years 993.62 ly

V-band magnitude

11.06 mag

Voyager-speed travel 17,522,452 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.254 mas

Total Proper Motion

34.787 mas/yr

PM Right Ascension

19.91 mas/yr

PM Declination

-28.53 mas/yr

Galactic Cartesian (pc)

x = 0.271 · y = -0.692 · z = 0.669

Equatorial (J2000)

RA 291.38613° · Dec 41.99014°

Galactic ℓ, b

74.228° · 11.945°

Ecliptic λ, β

306.304° · 62.759°

HTM-20 index

-383871624