Key parameters at a glance

A radius of 2.43 Earth radii
A mass of 6.48 Earth masses
Surface gravity around 1.10 g
An orbital period of 33.416 days
Semi-major axis 0.2160 AU
Equilibrium temperature 689 K (416 °C)
Distance from Earth 3,398.61 light-years
Earth Similarity Index 0.372
Travel time at Voyager 1 speed 59,934,497 years

1 sibling around Kepler-147

Kepler-147 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-147 b	Super-Earth	1.53	2.96	12.611	953	2014
Kepler-147 c this	Sub-Neptune	2.43	6.48	33.416	689	2014

Kepler-147 c Planet Profile

Physical Specs

Radius

2.43 R⊕

Radius (Jupiter)

0.217 R♃

Mass

6.48 M⊕

Mass (Jupiter)

0.020 M♃

Density

2.48 g/cm³

Surface Gravity

1.10 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.372

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

#1281of 1978

top 64.7%

This planet

2.43R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-233 b 2.43 R⊕ Kepler-55 b 2.43 R⊕ TOI-4184 b 2.43 R⊕

Metric	Earth	Kepler-147 c	Jupiter
Radius (R⊕)	1.00	2.43	11.21
Mass (M⊕)	1.00	6.48	317.83
Density (g/cm³)	5.51	2.48	1.33
Surface Gravity (g)	1.00	1.10	2.53
Insolation (S⊕)	1.00	61.29	0.037

Star Catalogue Identifiers

TIC

TIC 121458206

Gaia DR2

Gaia DR2 2099686125195464576

Gaia DR3

Gaia DR3 2099686125195464576

System

Kepler-147

Percentile among Sub-Neptune cohort

Radius 2.430 R⊕ · percentile 35 / cohort 1978

Mass 6.480 M⊕ · percentile 33 / cohort 1978

Orbital period 33.42 d · percentile 76 / cohort 1946

Distance 1,042.02 pc · percentile 81 / cohort 1975

ESI 0.372 · percentile 46 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

33.416 days

Semi-major axis

0.2160 AU

Eccentricity

0.000

Inclination

85.15 °

Year Length

A year here lasts approximately 33.42 Earth days (9.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2160 AU.

Transit Fingerprint

Depth

0.028 %

Duration

7.293 h

Impact parameter b

0.020

Rp / R★

0.017450

Transit midpoint (BJD)

2,455,004.3338

Photometric dip

Transit produces a flux drop of 276 ppm lasting ≈ 7.29 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017450

Semi-major axis / stellar radius

20.000

Impact parameter (b)

0.020

Transit mid-time (BJD)

2,455,004.3338

Angular separation (arcsec)

0.20700

Eq. Temperature

689K

(416 °C)

Insolation (S⊕)

61.29

Earth = 1.00

Earth Similarity (ESI)

0.372

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

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-147

Spectral Class

F-type yellow-white

Effective Temperature

6,012 K — hotter than the Sun (5,778 K)

Estimated Age

5.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.468 R☉

Stellar Mass

1.145 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.182 dex

Stellar density

0.340 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,042.02 parsec

Light-years 3,398.61 ly

V-band magnitude

14.13 mag

Voyager-speed travel 59,934,497 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

0.931 mas

Total Proper Motion

8.147 mas/yr

PM Right Ascension

-7.37 mas/yr

PM Declination

-3.47 mas/yr

Galactic Cartesian (pc)

x = 0.240 · y = -0.738 · z = 0.631

Equatorial (J2000)

RA 287.97572° · Dec 39.08717°

Galactic ℓ, b

70.408° · 13.056°

Ecliptic λ, β

299.312° · 60.710°

HTM-20 index

-720953842