Key parameters at a glance

A radius of 2.28 Earth radii
A mass of 5.82 Earth masses
Surface gravity around 1.12 g
An orbital period of 26.964 days
Semi-major axis 0.1773 AU
Equilibrium temperature 573 K (300 °C)
Distance from Earth 5,645.04 light-years
Earth Similarity Index 0.454
Travel time at Voyager 1 speed 99,550,325 years

Kepler-947 b Planet Profile

Physical Specs

Radius

2.28 R⊕

Radius (Jupiter)

0.203 R♃

Mass

5.82 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.70 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.454

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1536of 1978

top 77.6%

This planet

2.28R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 806 c 2.28 R⊕ Kepler-1020 b 2.28 R⊕ DMPP-6 b 2.28 R⊕

Metric	Earth	Kepler-947 b	Jupiter
Radius (R⊕)	1.00	2.28	11.21
Mass (M⊕)	1.00	5.82	317.83
Density (g/cm³)	5.51	2.70	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	51.95	0.037

Star Catalogue Identifiers

TIC

TIC 271050878

Gaia DR2

Gaia DR2 2077553200951551360

Gaia DR3

Gaia DR3 2077553200951551360

System

Kepler-947

Percentile among Sub-Neptune cohort

Radius 2.280 R⊕ · percentile 22 / cohort 1978

Mass 5.820 M⊕ · percentile 22 / cohort 1978

Orbital period 26.96 d · percentile 71 / cohort 1946

Distance 1,730.78 pc · percentile 95 / cohort 1975

ESI 0.454 · percentile 63 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

26.964 days

Semi-major axis

0.1773 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 26.96 Earth days (7.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1773 AU.

Transit Fingerprint

Depth

0.060 %

Duration

3.949 h

Impact parameter b

0.006

Rp / R★

0.024301

Transit midpoint (BJD)

2,454,978.3434

Photometric dip

Transit produces a flux drop of 602 ppm lasting ≈ 3.95 h.

Extended Orbital Architecture

Planet / star radius ratio

0.024301

Semi-major axis / stellar radius

55.530

Impact parameter (b)

0.006

Transit mid-time (BJD)

2,454,978.3434

Angular separation (arcsec)

0.10200

Eq. Temperature

573K

(300 °C)

Insolation (S⊕)

51.95

Earth = 1.00

Earth Similarity (ESI)

0.454

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

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-947

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,508 K — cooler than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.870 R☉

Stellar Mass

0.900 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.520 dex

Stellar density

4.456 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,730.78 parsec

Light-years 5,645.04 ly

V-band magnitude

16.06 mag

Voyager-speed travel 99,550,325 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.550 mas

Total Proper Motion

2.055 mas/yr

PM Right Ascension

-0.75 mas/yr

PM Declination

-1.91 mas/yr

Galactic Cartesian (pc)

x = 0.305 · y = -0.674 · z = 0.672

Equatorial (J2000)

RA 294.36673° · Dec 42.25264°

Galactic ℓ, b

75.481° · 10.090°

Ecliptic λ, β

311.008° · 62.266°

HTM-20 index

-807456312