Key parameters at a glance

A radius of 0.86 Earth radii
A mass of 7.70 Earth masses
Surface gravity around 10.41 g
An orbital period of 7.958 days
Semi-major axis 0.0838 AU
Equilibrium temperature 1,173 K (900 °C)
Distance from Earth 1,715.57 light-years
Earth Similarity Index 0.144
Travel time at Voyager 1 speed 30,254,089 years

3 siblings around Kepler-107

Kepler-107 d 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-107 b	Super-Earth	1.54	3.80	3.180	1,592	2014
Kepler-107 c	Super-Earth	1.60	10.00	4.901	1,378	2014
Kepler-107 d this	Rocky Terrestrial	0.86	7.70	7.958	1,173	2014
Kepler-107 e	Sub-Neptune	2.90	14.10	14.749	955	2014

Kepler-107 d Planet Profile

Physical Specs

Radius

0.86 R⊕

Radius (Jupiter)

0.077 R♃

Mass

7.70 M⊕

Mass (Jupiter)

0.024 M♃

Density

67.00 g/cm³

Surface Gravity

10.41 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.144

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#444of 570

top 77.7%

This planet

0.86R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1258 b 0.86 R⊕ Kepler-352 b 0.86 R⊕ Kepler-1361 b 0.86 R⊕

Metric	Earth	Kepler-107 d	Jupiter
Radius (R⊕)	1.00	0.86	11.21
Mass (M⊕)	1.00	7.70	317.83
Density (g/cm³)	5.51	67.00	1.33
Surface Gravity (g)	1.00	10.41	2.53
Insolation (S⊕)	1.00	315.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7.700 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 27988327

Gaia DR2

Gaia DR2 2086625752425381632

Gaia DR3

Gaia DR3 2086625752425381632

System

Kepler-107

Percentile among Rocky Terrestrial cohort

Radius 0.860 R⊕ · percentile 21 / cohort 570

Mass 7.700 M⊕ · percentile 97 / cohort 570

Orbital period 7.96 d · percentile 73 / cohort 567

Distance 526.00 pc · percentile 66 / cohort 566

ESI 0.144 · percentile 4 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

7.958 days

Semi-major axis

0.0838 AU

Eccentricity

0.110

Inclination

87.55 °

Year Length

A year here lasts approximately 7.96 Earth days (2.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0838 AU.

Transit Fingerprint

Depth

0.006 %

Duration

4.384 h

Impact parameter b

0.946

Rp / R★

0.006940

Transit midpoint (BJD)

2,455,702.9547

Photometric dip

Transit produces a flux drop of 58 ppm lasting ≈ 4.38 h.

Extended Orbital Architecture

Planet / star radius ratio

0.006940

Semi-major axis / stellar radius

5.050

Impact parameter (b)

0.946

RV semi-amplitude (K)

2.100 m/s

Transit mid-time (BJD)

2,455,702.9547

Angular separation (arcsec)

0.15900

Eq. Temperature

1,173K

(900 °C)

Insolation (S⊕)

315.00

Earth = 1.00

Earth Similarity (ESI)

0.144

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-107

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,854 K — hotter than the Sun (5,778 K)

Estimated Age

4.29 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.447 R☉

Stellar Mass

1.238 M☉

Metallicity [Fe/H]

0.32

Extended Stellar Properties

Surface gravity (log g)

4.210 dex

Stellar density

0.400 g/cm³

Systemic radial velocity

5.64 km/s

Rotational v·sin i

3.60 km/s

Rotation period

20.30 days

Metallicity ratio

[Fe/H]

Distance

526.00 parsec

Light-years 1,715.57 ly

V-band magnitude

12.54 mag

Voyager-speed travel 30,254,089 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.872 mas

Total Proper Motion

9.486 mas/yr

PM Right Ascension

-9.48 mas/yr

PM Declination

0.32 mas/yr

Galactic Cartesian (pc)

x = 0.303 · y = -0.594 · z = 0.746

Equatorial (J2000)

RA 297.02816° · Dec 48.20860°

Galactic ℓ, b

81.726° · 11.233°

Ecliptic λ, β

320.673° · 66.954°

HTM-20 index

2092807115