Key parameters at a glance

A radius of 13.88 Earth radii
An orbital period of 3.856 days
Semi-major axis 0.0505 AU
Equilibrium temperature 1,212 K (939 °C)
Distance from Earth 4,100.30 light-years
Earth Similarity Index 0.039
Travel time at Voyager 1 speed 72,308,835 years

Kepler-731 b Planet Profile

Physical Specs

Radius

13.88 R⊕

Radius (Jupiter)

1.238 R♃

Mass

— M⊕

Mass (Jupiter)

— M♃

Density

— g/cm³

Surface Gravity

— g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.039

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

#506of 1771

top 28.5%

This planet

13.88R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

NGTS-17 b 13.90 R⊕ WASP-18 b 13.90 R⊕ WASP-180 A b 13.90 R⊕

Metric	Earth	Kepler-731 b	Jupiter
Radius (R⊕)	1.00	13.88	11.21
Mass (M⊕)	1.00	—	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	—	2.53
Insolation (S⊕)	1.00	456.70	0.037

Star Catalogue Identifiers

TIC

TIC 272366748

Gaia DR2

Gaia DR2 2080172576942778112

Gaia DR3

Gaia DR3 2080172576942778112

System

Kepler-731

Percentile among Gas Giant cohort

Radius 13.880 R⊕ · percentile 71 / cohort 1771

Orbital period 3.86 d · percentile 27 / cohort 1533

Distance 1,257.16 pc · percentile 88 / cohort 1759

ESI 0.039 · percentile 2 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.856 days

Semi-major axis

0.0505 AU

Eccentricity

0.000

Inclination

87.96 °

Year Length

A year here lasts approximately 3.86 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0505 AU.

Transit Fingerprint

Depth

1.747 %

Duration

3.210 h

Impact parameter b

0.001

Rp / R★

0.120248

Transit midpoint (BJD)

2,455,003.6789

Photometric dip

Transit produces a flux drop of 17,471 ppm lasting ≈ 3.21 h.

Extended Orbital Architecture

Planet / star radius ratio

0.120248

Semi-major axis / stellar radius

10.301

Impact parameter (b)

0.001

Transit mid-time (BJD)

2,455,003.6789

Angular separation (arcsec)

0.04020

Eq. Temperature

1,212K

(939 °C)

Insolation (S⊕)

456.70

Earth = 1.00

Earth Similarity (ESI)

0.039

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-731

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,849 K — hotter than the Sun (5,778 K)

Estimated Age

3.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.060 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.410 dex

Stellar density

1.391 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,257.16 parsec

Light-years 4,100.30 ly

V-band magnitude

15.39 mag

Voyager-speed travel 72,308,835 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

0.768 mas

Total Proper Motion

6.715 mas/yr

PM Right Ascension

2.16 mas/yr

PM Declination

-6.36 mas/yr

Galactic Cartesian (pc)

x = 0.311 · y = -0.627 · z = 0.714

Equatorial (J2000)

RA 296.39319° · Dec 45.56853°

Galactic ℓ, b

79.152° · 10.359°

Ecliptic λ, β

316.888° · 64.770°

HTM-20 index

-1896255904