Key parameters at a glance

A radius of 3.32 Earth radii
A mass of 11.00 Earth masses
Surface gravity around 1.00 g
An orbital period of 8.172 days
Semi-major axis 0.0779 AU
Equilibrium temperature 858 K (585 °C)
Distance from Earth 3,463.03 light-years
Earth Similarity Index 0.263
Travel time at Voyager 1 speed 61,070,470 years

Kepler-1740 b Planet Profile

Physical Specs

Radius

3.32 R⊕

Radius (Jupiter)

0.296 R♃

Mass

11.00 M⊕

Mass (Jupiter)

0.035 M♃

Density

1.65 g/cm³

Surface Gravity

1.00 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.263

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

#267of 1978

top 13.4%

This planet

3.32R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-620 b 3.32 R⊕ Kepler-1270 b 3.32 R⊕ Kepler-739 b 3.32 R⊕

Metric	Earth	Kepler-1740 b	Jupiter
Radius (R⊕)	1.00	3.32	11.21
Mass (M⊕)	1.00	11.00	317.83
Density (g/cm³)	5.51	1.65	1.33
Surface Gravity (g)	1.00	1.00	2.53
Insolation (S⊕)	1.00	127.95	0.037

Star Catalogue Identifiers

TIC

TIC 138479461

Gaia DR2

Gaia DR2 2052381737659167488

Gaia DR3

Gaia DR3 2052381737659167488

System

Kepler-1740

Percentile among Sub-Neptune cohort

Radius 3.323 R⊕ · percentile 87 / cohort 1978

Mass 11.000 M⊕ · percentile 80 / cohort 1978

Orbital period 8.17 d · percentile 27 / cohort 1946

Distance 1,061.77 pc · percentile 82 / cohort 1975

ESI 0.263 · percentile 19 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.172 days

Semi-major axis

0.0779 AU

Eccentricity

0.000

Inclination

82.80 °

Year Length

A year here lasts approximately 8.17 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0779 AU.

Transit Fingerprint

Depth

0.086 %

Duration

3.902 h

Impact parameter b

0.942

Rp / R★

0.033700

Transit midpoint (BJD)

2,455,194.2025

Photometric dip

Transit produces a flux drop of 864 ppm lasting ≈ 3.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.033700

Semi-major axis / stellar radius

6.960

Impact parameter (b)

0.942

Transit mid-time (BJD)

2,455,194.2025

Angular separation (arcsec)

0.07340

Eq. Temperature

858K

(585 °C)

Insolation (S⊕)

127.95

Earth = 1.00

Earth Similarity (ESI)

0.263

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-1740

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,705 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.905 R☉

Stellar Mass

0.943 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.499 dex

Stellar density

0.114 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,061.77 parsec

Light-years 3,463.03 ly

V-band magnitude

15.45 mag

Voyager-speed travel 61,070,470 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.914 mas

Total Proper Motion

8.517 mas/yr

PM Right Ascension

8.39 mas/yr

PM Declination

-1.48 mas/yr

Galactic Cartesian (pc)

x = 0.315 · y = -0.711 · z = 0.628

Equatorial (J2000)

RA 293.87366° · Dec 38.92245°

Galactic ℓ, b

72.316° · 8.870°

Ecliptic λ, β

308.010° · 59.251°

HTM-20 index

1329307618