Key parameters at a glance

A radius of 2.33 Earth radii
A mass of 6.04 Earth masses
Surface gravity around 1.11 g
An orbital period of 13.712 days
Semi-major axis 0.1091 AU
Equilibrium temperature 676 K (403 °C)
Distance from Earth 3,411.33 light-years
Earth Similarity Index 0.385
Travel time at Voyager 1 speed 60,158,816 years

Kepler-1247 b Planet Profile

Physical Specs

Radius

2.33 R⊕

Radius (Jupiter)

0.208 R♃

Mass

6.04 M⊕

Mass (Jupiter)

0.019 M♃

Density

2.62 g/cm³

Surface Gravity

1.11 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.385

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

#1451of 1978

top 73.3%

This planet

2.33R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 367 d 2.33 R⊕ Kepler-241 b 2.33 R⊕ Kepler-1983 b 2.33 R⊕

Metric	Earth	Kepler-1247 b	Jupiter
Radius (R⊕)	1.00	2.33	11.21
Mass (M⊕)	1.00	6.04	317.83
Density (g/cm³)	5.51	2.62	1.33
Surface Gravity (g)	1.00	1.11	2.53
Insolation (S⊕)	1.00	41.47	0.037

Star Catalogue Identifiers

TIC

TIC 271165854

Gaia DR2

Gaia DR2 2128141799661062400

Gaia DR3

Gaia DR3 2128141799661062400

System

Kepler-1247

Percentile among Sub-Neptune cohort

Radius 2.330 R⊕ · percentile 26 / cohort 1978

Mass 6.040 M⊕ · percentile 25 / cohort 1978

Orbital period 13.71 d · percentile 47 / cohort 1946

Distance 1,045.92 pc · percentile 81 / cohort 1975

ESI 0.385 · percentile 49 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

13.712 days

Semi-major axis

0.1091 AU

Eccentricity

0.000

Inclination

88.82 °

Year Length

A year here lasts approximately 13.71 Earth days (3.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1091 AU.

Transit Fingerprint

Depth

0.079 %

Duration

2.493 h

Impact parameter b

0.238

Rp / R★

0.026269

Transit midpoint (BJD)

2,454,968.5187

Photometric dip

Transit produces a flux drop of 787 ppm lasting ≈ 2.49 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026269

Semi-major axis / stellar radius

41.960

Impact parameter (b)

0.238

Transit mid-time (BJD)

2,454,968.5187

Angular separation (arcsec)

0.10400

Eq. Temperature

676K

(403 °C)

Insolation (S⊕)

41.47

Earth = 1.00

Earth Similarity (ESI)

0.385

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-1247

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,303 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.860 M☉

Metallicity [Fe/H]

-0.05

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

7.431 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,045.92 parsec

Light-years 3,411.33 ly

V-band magnitude

15.93 mag

Voyager-speed travel 60,158,816 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.929 mas

Total Proper Motion

10.791 mas/yr

PM Right Ascension

6.17 mas/yr

PM Declination

-8.85 mas/yr

Galactic Cartesian (pc)

x = 0.285 · y = -0.625 · z = 0.727

Equatorial (J2000)

RA 294.53360° · Dec 46.61824°

Galactic ℓ, b

79.488° · 11.988°

Ecliptic λ, β

315.099° · 66.258°

HTM-20 index

-1101957632