Key parameters at a glance

A radius of 2.56 Earth radii
A mass of 11.17 Earth masses
Surface gravity around 1.70 g
An orbital period of 43.845 days
Semi-major axis 0.2401 AU
Equilibrium temperature 531 K (258 °C)
Distance from Earth 1,449.18 light-years
Earth Similarity Index 0.479
Travel time at Voyager 1 speed 25,556,338 years

3 siblings around Kepler-106

Kepler-106 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-106 b	Rocky Terrestrial	0.82	5.30	6.165	1,021	2014
Kepler-106 c	Sub-Neptune	2.50	10.44	13.571	785	2014
Kepler-106 d	Rocky Terrestrial	0.95	8.10	23.980	649	2014
Kepler-106 e this	Sub-Neptune	2.56	11.17	43.845	531	2014

Kepler-106 e Planet Profile

Physical Specs

Radius

2.56 R⊕

Radius (Jupiter)

0.228 R♃

Mass

11.17 M⊕

Mass (Jupiter)

0.035 M♃

Density

3.10 g/cm³

Surface Gravity

1.70 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.479

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

#1092of 1978

top 55.2%

This planet

2.56R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-171 c 2.56 R⊕ Kepler-640 b 2.56 R⊕ Kepler-175 b 2.56 R⊕

Metric	Earth	Kepler-106 e	Jupiter
Radius (R⊕)	1.00	2.56	11.21
Mass (M⊕)	1.00	11.17	317.83
Density (g/cm³)	5.51	3.10	1.33
Surface Gravity (g)	1.00	1.70	2.53
Insolation (S⊕)	1.00	20.29	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	11.170 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	6.591 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 184997417

Gaia DR2

Gaia DR2 2082074942519913344

Gaia DR3

Gaia DR3 2082074942519913344

System

Kepler-106

Percentile among Sub-Neptune cohort

Radius 2.560 R⊕ · percentile 44 / cohort 1978

Mass 11.170 M⊕ · percentile 81 / cohort 1978

Orbital period 43.84 d · percentile 83 / cohort 1946

Distance 444.32 pc · percentile 44 / cohort 1975

ESI 0.479 · percentile 68 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

43.845 days

Semi-major axis

0.2401 AU

Eccentricity

0.000

Inclination

88.27 °

Year Length

A year here lasts approximately 43.84 Earth days (12.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2401 AU.

Transit Fingerprint

Depth

0.062 %

Duration

6.418 h

Impact parameter b

0.280

Rp / R★

0.022676

Transit midpoint (BJD)

2,454,984.9336

Photometric dip

Transit produces a flux drop of 615 ppm lasting ≈ 6.42 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022676

Semi-major axis / stellar radius

28.200

Impact parameter (b)

0.280

RV semi-amplitude (K)

1.950 m/s

Transit mid-time (BJD)

2,454,984.9336

Angular separation (arcsec)

0.54000

Eq. Temperature

531K

(258 °C)

Insolation (S⊕)

20.29

Earth = 1.00

Earth Similarity (ESI)

0.479

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Marcy et al. 2014

Instrument

Kepler CCD Array

Publication

2014-02

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-106

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,858 K — hotter than the Sun (5,778 K)

Estimated Age

4.83 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.040 R☉

Stellar Mass

1.000 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

4.407 dex

Stellar density

1.380 g/cm³

Systemic radial velocity

-56.18 km/s

Rotational v·sin i

0.30 km/s

Metallicity ratio

[Fe/H]

Distance

444.32 parsec

Light-years 1,449.18 ly

V-band magnitude

12.92 mag

Voyager-speed travel 25,556,338 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.222 mas

Total Proper Motion

7.971 mas/yr

PM Right Ascension

7.93 mas/yr

PM Declination

-0.76 mas/yr

Galactic Cartesian (pc)

x = 0.367 · y = -0.614 · z = 0.699

Equatorial (J2000)

RA 300.86401° · Dec 44.33755°

Galactic ℓ, b

79.671° · 7.003°

Ecliptic λ, β

322.130° · 62.304°

HTM-20 index

-1622776104