Key parameters at a glance

A radius of 4.49 Earth radii
A mass of 18.40 Earth masses
Surface gravity around 0.91 g
An orbital period of 13.810 days
Semi-major axis 0.1131 AU
Equilibrium temperature 833 K (560 °C)
Distance from Earth 4,654.51 light-years
Earth Similarity Index 0.238
Travel time at Voyager 1 speed 82,082,227 years

Kepler-1730 b Planet Profile

Physical Specs

Radius

4.49 R⊕

Radius (Jupiter)

0.400 R♃

Mass

18.40 M⊕

Mass (Jupiter)

0.058 M♃

Density

1.12 g/cm³

Surface Gravity

0.91 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.238

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

#462of 574

top 80.3%

This planet

4.49R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 5278 c 4.49 R⊕ Kepler-1769 b 4.47 R⊕ K2-43 b 4.51 R⊕

Metric	Earth	Kepler-1730 b	Jupiter
Radius (R⊕)	1.00	4.49	11.21
Mass (M⊕)	1.00	18.40	317.83
Density (g/cm³)	5.51	1.12	1.33
Surface Gravity (g)	1.00	0.91	2.53
Insolation (S⊕)	1.00	113.75	0.037

Star Catalogue Identifiers

TIC

TIC 351803524

Gaia DR2

Gaia DR2 2105275015817638272

Gaia DR3

Gaia DR3 2105275015817638272

System

Kepler-1730

Percentile among Neptune-like cohort

Radius 4.485 R⊕ · percentile 20 / cohort 574

Mass 18.400 M⊕ · percentile 23 / cohort 574

Orbital period 13.81 d · percentile 44 / cohort 524

Distance 1,427.08 pc · percentile 83 / cohort 572

ESI 0.238 · percentile 38 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

13.810 days

Semi-major axis

0.1131 AU

Eccentricity

0.000

Inclination

88.04 °

Year Length

A year here lasts approximately 13.81 Earth days (3.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1131 AU.

Transit Fingerprint

Depth

0.131 %

Duration

3.048 h

Impact parameter b

0.791

Rp / R★

0.036595

Transit midpoint (BJD)

2,454,977.7160

Photometric dip

Transit produces a flux drop of 1,310 ppm lasting ≈ 3.05 h.

Extended Orbital Architecture

Planet / star radius ratio

0.036595

Semi-major axis / stellar radius

23.200

Impact parameter (b)

0.791

Transit mid-time (BJD)

2,454,977.7160

Angular separation (arcsec)

0.07930

Eq. Temperature

833K

(560 °C)

Insolation (S⊕)

113.75

Earth = 1.00

Earth Similarity (ESI)

0.238

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-1730

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,942 K — hotter than the Sun (5,778 K)

Estimated Age

7.40 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.142 R☉

Stellar Mass

1.009 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.327 dex

Stellar density

1.237 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,427.08 parsec

Light-years 4,654.51 ly

V-band magnitude

15.48 mag

Voyager-speed travel 82,082,227 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.672 mas

Total Proper Motion

14.045 mas/yr

PM Right Ascension

-5.94 mas/yr

PM Declination

-12.73 mas/yr

Galactic Cartesian (pc)

x = 0.150 · y = -0.707 · z = 0.691

Equatorial (J2000)

RA 281.96058° · Dec 43.70304°

Galactic ℓ, b

73.081° · 18.974°

Ecliptic λ, β

291.824° · 66.238°

HTM-20 index

-601758315