Key parameters at a glance

A radius of 4.27 Earth radii
A mass of 16.80 Earth masses
Surface gravity around 0.92 g
An orbital period of 6.230 days
Semi-major axis 0.0660 AU
Equilibrium temperature 875 K (602 °C)
Distance from Earth 4,309.76 light-years
Earth Similarity Index 0.231
Travel time at Voyager 1 speed 76,002,616 years

Kepler-1747 b Planet Profile

Physical Specs

Radius

4.27 R⊕

Radius (Jupiter)

0.381 R♃

Mass

16.80 M⊕

Mass (Jupiter)

0.053 M♃

Density

1.19 g/cm³

Surface Gravity

0.92 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.231

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#505of 574

top 87.8%

This planet

4.27R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 192310 b 4.27 R⊕ HD 34445 e 4.26 R⊕ Kepler-230 b 4.26 R⊕

Metric	Earth	Kepler-1747 b	Jupiter
Radius (R⊕)	1.00	4.27	11.21
Mass (M⊕)	1.00	16.80	317.83
Density (g/cm³)	5.51	1.19	1.33
Surface Gravity (g)	1.00	0.92	2.53
Insolation (S⊕)	1.00	138.33	0.037

Star Catalogue Identifiers

TIC

TIC 164670571

Gaia DR2

Gaia DR2 2106814984930919296

Gaia DR3

Gaia DR3 2106814984930919296

System

Kepler-1747

Percentile among Neptune-like cohort

Radius 4.265 R⊕ · percentile 12 / cohort 574

Mass 16.800 M⊕ · percentile 16 / cohort 574

Orbital period 6.23 d · percentile 26 / cohort 524

Distance 1,321.38 pc · percentile 81 / cohort 572

ESI 0.231 · percentile 36 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

6.230 days

Semi-major axis

0.0660 AU

Eccentricity

0.000

Inclination

87.55 °

Year Length

A year here lasts approximately 6.23 Earth days (1.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0660 AU.

Transit Fingerprint

Depth

0.145 %

Duration

1.649 h

Impact parameter b

0.920

Rp / R★

0.043493

Transit midpoint (BJD)

2,455,014.2961

Photometric dip

Transit produces a flux drop of 1,449 ppm lasting ≈ 1.65 h.

Extended Orbital Architecture

Planet / star radius ratio

0.043493

Semi-major axis / stellar radius

30.750

Impact parameter (b)

0.920

Transit mid-time (BJD)

2,455,014.2961

Angular separation (arcsec)

0.04990

Eq. Temperature

875K

(602 °C)

Insolation (S⊕)

138.33

Earth = 1.00

Earth Similarity (ESI)

0.231

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

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1747

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,477 K — cooler than the Sun (5,778 K)

Estimated Age

0.70 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.865 R☉

Stellar Mass

0.983 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

4.557 dex

Stellar density

3.279 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,321.38 parsec

Light-years 4,309.76 ly

V-band magnitude

16.20 mag

Voyager-speed travel 76,002,616 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.728 mas

Total Proper Motion

5.042 mas/yr

PM Right Ascension

1.37 mas/yr

PM Declination

4.85 mas/yr

Galactic Cartesian (pc)

x = 0.173 · y = -0.682 · z = 0.710

Equatorial (J2000)

RA 284.20966° · Dec 45.25808°

Galactic ℓ, b

75.204° · 18.006°

Ecliptic λ, β

296.698° · 67.385°

HTM-20 index

495565719