Key parameters at a glance

A radius of 4.57 Earth radii
A mass of 18.90 Earth masses
Surface gravity around 0.90 g
An orbital period of 3.584 days
Semi-major axis 0.0462 AU
Equilibrium temperature 1,131 K (858 °C)
Distance from Earth 4,703.23 light-years
Earth Similarity Index 0.170
Travel time at Voyager 1 speed 82,941,540 years

Kepler-740 b Planet Profile

Physical Specs

Radius

4.57 R⊕

Radius (Jupiter)

0.408 R♃

Mass

18.90 M⊕

Mass (Jupiter)

0.060 M♃

Density

1.09 g/cm³

Surface Gravity

0.90 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.170

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#453of 574

top 78.7%

This planet

4.57R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

GJ 3470 b 4.57 R⊕ K2-405 b 4.57 R⊕ Kepler-1656 b 4.57 R⊕

Metric	Earth	Kepler-740 b	Jupiter
Radius (R⊕)	1.00	4.57	11.21
Mass (M⊕)	1.00	18.90	317.83
Density (g/cm³)	5.51	1.09	1.33
Surface Gravity (g)	1.00	0.90	2.53
Insolation (S⊕)	1.00	432.87	0.037

Star Catalogue Identifiers

TIC

TIC 158270511

Gaia DR2

Gaia DR2 2130544262626885120

Gaia DR3

Gaia DR3 2130544262626885120

System

Kepler-740

Percentile among Neptune-like cohort

Radius 4.570 R⊕ · percentile 21 / cohort 574

Mass 18.900 M⊕ · percentile 24 / cohort 574

Orbital period 3.58 d · percentile 9 / cohort 524

Distance 1,442.02 pc · percentile 83 / cohort 572

ESI 0.170 · percentile 20 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

3.584 days

Semi-major axis

0.0462 AU

Eccentricity

0.000

Inclination

89.76 °

Year Length

A year here lasts approximately 3.58 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0462 AU.

Transit Fingerprint

Depth

0.261 %

Duration

2.745 h

Impact parameter b

0.660

Rp / R★

0.048333

Transit midpoint (BJD)

2,455,003.4279

Photometric dip

Transit produces a flux drop of 2,608 ppm lasting ≈ 2.74 h.

Extended Orbital Architecture

Planet / star radius ratio

0.048333

Semi-major axis / stellar radius

10.496

Impact parameter (b)

0.660

Transit mid-time (BJD)

2,455,003.4279

Angular separation (arcsec)

0.03200

Eq. Temperature

1,131K

(858 °C)

Insolation (S⊕)

432.87

Earth = 1.00

Earth Similarity (ESI)

0.170

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-740

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,438 K — cooler than the Sun (5,778 K)

Estimated Age

4.79 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.870 R☉

Stellar Mass

0.910 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.520 dex

Stellar density

1.681 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,442.02 parsec

Light-years 4,703.23 ly

V-band magnitude

16.02 mag

Voyager-speed travel 82,941,540 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.665 mas

Total Proper Motion

4.552 mas/yr

PM Right Ascension

2.96 mas/yr

PM Declination

-3.46 mas/yr

Galactic Cartesian (pc)

x = 0.195 · y = -0.658 · z = 0.728

Equatorial (J2000)

RA 286.48226° · Dec 46.69246°

Galactic ℓ, b

77.205° · 17.052°

Ecliptic λ, β

301.785° · 68.321°

HTM-20 index

-1300475531