Key parameters at a glance

A radius of 2.61 Earth radii
A mass of 7.32 Earth masses
Surface gravity around 1.07 g
An orbital period of 10.628 days
Semi-major axis 0.0961 AU
Equilibrium temperature 872 K (599 °C)
Distance from Earth 5,405.58 light-years
Earth Similarity Index 0.285
Travel time at Voyager 1 speed 95,327,382 years

Kepler-1147 b Planet Profile

Physical Specs

Radius

2.61 R⊕

Radius (Jupiter)

0.233 R♃

Mass

7.32 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.26 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.285

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

#999of 1978

top 50.5%

This planet

2.61R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-214 b 2.61 R⊕ GJ 143 b 2.61 R⊕ TOI-1422 c 2.61 R⊕

Metric	Earth	Kepler-1147 b	Jupiter
Radius (R⊕)	1.00	2.61	11.21
Mass (M⊕)	1.00	7.32	317.83
Density (g/cm³)	5.51	2.26	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	206.56	0.037

Star Catalogue Identifiers

TIC

TIC 137757057

Gaia DR2

Gaia DR2 2053636452223709696

Gaia DR3

Gaia DR3 2053636452223709696

System

Kepler-1147

Percentile among Sub-Neptune cohort

Radius 2.610 R⊕ · percentile 49 / cohort 1978

Mass 7.320 M⊕ · percentile 45 / cohort 1978

Orbital period 10.63 d · percentile 36 / cohort 1946

Distance 1,657.36 pc · percentile 95 / cohort 1975

ESI 0.285 · percentile 24 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.628 days

Semi-major axis

0.0961 AU

Eccentricity

0.000

Inclination

88.31 °

Year Length

A year here lasts approximately 10.63 Earth days (2.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0961 AU.

Transit Fingerprint

Depth

0.033 %

Duration

5.013 h

Impact parameter b

0.876

Rp / R★

0.020749

Transit midpoint (BJD)

2,454,970.8218

Photometric dip

Transit produces a flux drop of 327 ppm lasting ≈ 5.01 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020749

Semi-major axis / stellar radius

9.400

Impact parameter (b)

0.876

Transit mid-time (BJD)

2,454,970.8218

Angular separation (arcsec)

0.05800

Eq. Temperature

872K

(599 °C)

Insolation (S⊕)

206.56

Earth = 1.00

Earth Similarity (ESI)

0.285

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-1147

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,941 K — hotter than the Sun (5,778 K)

Estimated Age

3.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.140 R☉

Stellar Mass

1.090 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

0.684 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,657.36 parsec

Light-years 5,405.58 ly

V-band magnitude

15.61 mag

Voyager-speed travel 95,327,382 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.575 mas

Total Proper Motion

8.436 mas/yr

PM Right Ascension

-6.47 mas/yr

PM Declination

-5.41 mas/yr

Galactic Cartesian (pc)

x = 0.287 · y = -0.690 · z = 0.664

Equatorial (J2000)

RA 292.54748° · Dec 41.64292°

Galactic ℓ, b

74.301° · 11.015°

Ecliptic λ, β

307.835° · 62.152°

HTM-20 index

-405135614