Key parameters at a glance

A radius of 2.88 Earth radii
A mass of 8.65 Earth masses
Surface gravity around 1.04 g
An orbital period of 39.753 days
Semi-major axis 0.2249 AU
Equilibrium temperature 568 K (295 °C)
Distance from Earth 2,646.03 light-years
Earth Similarity Index 0.418
Travel time at Voyager 1 speed 46,662,769 years

Kepler-1723 b Planet Profile

Physical Specs

Radius

2.88 R⊕

Radius (Jupiter)

0.257 R♃

Mass

8.65 M⊕

Mass (Jupiter)

0.027 M♃

Density

1.99 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.418

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

#652of 1978

top 32.9%

This planet

2.88R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

KOI-351 f 2.88 R⊕ K2-378 b 2.88 R⊕ Kepler-178 c 2.88 R⊕

Metric	Earth	Kepler-1723 b	Jupiter
Radius (R⊕)	1.00	2.88	11.21
Mass (M⊕)	1.00	8.65	317.83
Density (g/cm³)	5.51	1.99	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	24.54	0.037

Star Catalogue Identifiers

TIC

TIC 271040560

Gaia DR2

Gaia DR2 2128157158464165504

Gaia DR3

Gaia DR3 2128157158464165504

System

Kepler-1723

Percentile among Sub-Neptune cohort

Radius 2.880 R⊕ · percentile 67 / cohort 1978

Mass 8.650 M⊕ · percentile 61 / cohort 1978

Orbital period 39.75 d · percentile 80 / cohort 1946

Distance 811.28 pc · percentile 66 / cohort 1975

ESI 0.418 · percentile 56 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

39.753 days

Semi-major axis

0.2249 AU

Eccentricity

0.000

Inclination

89.96 °

Year Length

A year here lasts approximately 39.75 Earth days (10.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2249 AU.

Transit Fingerprint

Depth

0.055 %

Duration

4.964 h

Impact parameter b

0.931

Rp / R★

0.021483

Transit midpoint (BJD)

2,455,008.4624

Photometric dip

Transit produces a flux drop of 549 ppm lasting ≈ 4.96 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021483

Semi-major axis / stellar radius

62.430

Impact parameter (b)

0.931

Transit mid-time (BJD)

2,455,008.4624

Angular separation (arcsec)

0.27700

Eq. Temperature

568K

(295 °C)

Insolation (S⊕)

24.54

Earth = 1.00

Earth Similarity (ESI)

0.418

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

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-1723

Spectral Class

F-type yellow-white

Effective Temperature

6,072 K — hotter than the Sun (5,778 K)

Estimated Age

3.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.010 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

-0.30

Extended Stellar Properties

Surface gravity (log g)

4.411 dex

Stellar density

2.913 g/cm³

Metallicity ratio

[Fe/H]

Distance

811.28 parsec

Light-years 2,646.03 ly

V-band magnitude

14.38 mag

Voyager-speed travel 46,662,769 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.204 mas

Total Proper Motion

12.433 mas/yr

PM Right Ascension

2.69 mas/yr

PM Declination

-12.14 mas/yr

Galactic Cartesian (pc)

x = 0.283 · y = -0.623 · z = 0.729

Equatorial (J2000)

RA 294.46274° · Dec 46.82140°

Galactic ℓ, b

79.651° · 12.124°

Ecliptic λ, β

315.197° · 66.463°

HTM-20 index

-1086709443