Key parameters at a glance

A radius of 0.95 Earth radii
A mass of 8.10 Earth masses
Surface gravity around 8.98 g
An orbital period of 23.980 days
Semi-major axis 0.1606 AU
Equilibrium temperature 649 K (376 °C)
Distance from Earth 1,449.18 light-years
Earth Similarity Index 0.344
Travel time at Voyager 1 speed 25,556,338 years

3 siblings around Kepler-106

Kepler-106 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-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 this	Rocky Terrestrial	0.95	8.10	23.980	649	2014
Kepler-106 e	Sub-Neptune	2.56	11.17	43.845	531	2014

Kepler-106 d Planet Profile

Physical Specs

Radius

0.95 R⊕

Radius (Jupiter)

0.085 R♃

Mass

8.10 M⊕

Mass (Jupiter)

0.025 M♃

Density

— g/cm³

Surface Gravity

8.98 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.344

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

#376of 570

top 65.8%

This planet

0.95R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1598 b 0.95 R⊕ Kepler-271 c 0.95 R⊕ Kepler-1049 b 0.95 R⊕

Metric	Earth	Kepler-106 d	Jupiter
Radius (R⊕)	1.00	0.95	11.21
Mass (M⊕)	1.00	8.10	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	8.98	2.53
Insolation (S⊕)	1.00	45.36	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8.100 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 184997417

Gaia DR2

Gaia DR2 2082074942519913344

Gaia DR3

Gaia DR3 2082074942519913344

System

Kepler-106

Percentile among Rocky Terrestrial cohort

Radius 0.950 R⊕ · percentile 33 / cohort 570

Mass 8.100 M⊕ · percentile 97 / cohort 570

Orbital period 23.98 d · percentile 94 / cohort 567

Distance 444.32 pc · percentile 58 / cohort 566

ESI 0.344 · percentile 50 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

23.980 days

Semi-major axis

0.1606 AU

Eccentricity

0.000

Inclination

85.45 °

Year Length

A year here lasts approximately 23.98 Earth days (6.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1606 AU.

Transit Fingerprint

Depth

0.010 %

Duration

5.351 h

Impact parameter b

0.450

Rp / R★

0.008362

Transit midpoint (BJD)

2,454,980.5326

Photometric dip

Transit produces a flux drop of 104 ppm lasting ≈ 5.35 h.

Extended Orbital Architecture

Planet / star radius ratio

0.008362

Semi-major axis / stellar radius

11.980

Impact parameter (b)

0.450

Transit mid-time (BJD)

2,454,980.5326

Angular separation (arcsec)

0.36200

Eq. Temperature

649K

(376 °C)

Insolation (S⊕)

45.36

Earth = 1.00

Earth Similarity (ESI)

0.344

0 = alien, 1 = Earth-identical

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

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