Key parameters at a glance

A radius of 2.51 Earth radii
A mass of 6.84 Earth masses
Surface gravity around 1.09 g
An orbital period of 18.396 days
Semi-major axis 0.1279 AU
Equilibrium temperature 582 K (309 °C)
Distance from Earth 1,273.81 light-years
Earth Similarity Index 0.432
Travel time at Voyager 1 speed 22,463,617 years

Kepler-1726 b Planet Profile

Physical Specs

Radius

2.51 R⊕

Radius (Jupiter)

0.224 R♃

Mass

6.84 M⊕

Mass (Jupiter)

0.022 M♃

Density

2.38 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.432

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

#1166of 1978

top 58.9%

This planet

2.51R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-445 c 2.51 R⊕ GJ 876 d 2.51 R⊕ Kepler-239 c 2.51 R⊕

Metric	Earth	Kepler-1726 b	Jupiter
Radius (R⊕)	1.00	2.51	11.21
Mass (M⊕)	1.00	6.84	317.83
Density (g/cm³)	5.51	2.38	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	24.00	0.037

Star Catalogue Identifiers

TIC

TIC 164721250

Gaia DR2

Gaia DR2 2107201909944691968

Gaia DR3

Gaia DR3 2107201909944691968

System

Kepler-1726

Percentile among Sub-Neptune cohort

Radius 2.509 R⊕ · percentile 41 / cohort 1978

Mass 6.840 M⊕ · percentile 38 / cohort 1978

Orbital period 18.40 d · percentile 59 / cohort 1946

Distance 390.55 pc · percentile 40 / cohort 1975

ESI 0.432 · percentile 59 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

18.396 days

Semi-major axis

0.1279 AU

Eccentricity

0.000

Inclination

88.18 °

Year Length

A year here lasts approximately 18.40 Earth days (5.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1279 AU.

Transit Fingerprint

Depth

0.071 %

Duration

2.784 h

Impact parameter b

0.909

Rp / R★

0.025277

Transit midpoint (BJD)

2,455,018.1402

Photometric dip

Transit produces a flux drop of 713 ppm lasting ≈ 2.78 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025277

Semi-major axis / stellar radius

23.700

Impact parameter (b)

0.909

Transit mid-time (BJD)

2,455,018.1402

Angular separation (arcsec)

0.32800

Eq. Temperature

582K

(309 °C)

Insolation (S⊕)

24.00

Earth = 1.00

Earth Similarity (ESI)

0.432

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-1726

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,316 K — cooler than the Sun (5,778 K)

Estimated Age

2.51 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.804 R☉

Stellar Mass

0.876 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.570 dex

Stellar density

1.164 g/cm³

Metallicity ratio

[Fe/H]

Distance

390.55 parsec

Light-years 1,273.81 ly

V-band magnitude

13.85 mag

Voyager-speed travel 22,463,617 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.532 mas

Total Proper Motion

3.091 mas/yr

PM Right Ascension

-0.11 mas/yr

PM Declination

3.09 mas/yr

Galactic Cartesian (pc)

x = 0.173 · y = -0.676 · z = 0.716

Equatorial (J2000)

RA 284.38615° · Dec 45.71973°

Galactic ℓ, b

75.704° · 18.053°

Ecliptic λ, β

297.323° · 67.799°

HTM-20 index

302202886