Key parameters at a glance

A radius of 4.82 Earth radii
A mass of 20.70 Earth masses
Surface gravity around 0.89 g
An orbital period of 7.584 days
Semi-major axis 0.0836 AU
Equilibrium temperature 1,228 K (955 °C)
Distance from Earth 6,065.78 light-years
Earth Similarity Index 0.151
Travel time at Voyager 1 speed 106,970,096 years

Kepler-1640 b Planet Profile

Physical Specs

Radius

4.82 R⊕

Radius (Jupiter)

0.430 R♃

Mass

20.70 M⊕

Mass (Jupiter)

0.065 M♃

Density

1.02 g/cm³

Surface Gravity

0.89 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.151

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

#411of 574

top 71.4%

This planet

4.82R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

K2-14 b 4.81 R⊕ Kepler-669 b 4.83 R⊕ TOI-6109 c 4.83 R⊕

Metric	Earth	Kepler-1640 b	Jupiter
Radius (R⊕)	1.00	4.82	11.21
Mass (M⊕)	1.00	20.70	317.83
Density (g/cm³)	5.51	1.02	1.33
Surface Gravity (g)	1.00	0.89	2.53
Insolation (S⊕)	1.00	537.40	0.037

Star Catalogue Identifiers

TIC

TIC 377915723

Gaia DR2

Gaia DR2 2076578312097047168

Gaia DR3

Gaia DR3 2076578312097047168

System

Kepler-1640

Percentile among Neptune-like cohort

Radius 4.820 R⊕ · percentile 28 / cohort 574

Mass 20.700 M⊕ · percentile 31 / cohort 574

Orbital period 7.58 d · percentile 29 / cohort 524

Distance 1,859.78 pc · percentile 89 / cohort 572

ESI 0.151 · percentile 14 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

7.584 days

Semi-major axis

0.0836 AU

Eccentricity

0.000

Inclination

85.04 °

Year Length

A year here lasts approximately 7.58 Earth days (2.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0836 AU.

Transit Fingerprint

Depth

0.101 %

Duration

3.810 h

Impact parameter b

0.611

Rp / R★

0.030869

Transit midpoint (BJD)

2,454,970.8486

Photometric dip

Transit produces a flux drop of 1,005 ppm lasting ≈ 3.81 h.

Extended Orbital Architecture

Planet / star radius ratio

0.030869

Semi-major axis / stellar radius

9.420

Impact parameter (b)

0.611

Transit mid-time (BJD)

2,454,970.8486

Angular separation (arcsec)

0.04500

Eq. Temperature

1,228K

(955 °C)

Insolation (S⊕)

537.40

Earth = 1.00

Earth Similarity (ESI)

0.151

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-1640

Spectral Class

F-type yellow-white

Effective Temperature

6,324 K — hotter than the Sun (5,778 K)

Estimated Age

2.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.430 R☉

Stellar Mass

1.270 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.230 dex

Stellar density

0.275 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,859.78 parsec

Light-years 6,065.78 ly

V-band magnitude

14.75 mag

Voyager-speed travel 106,970,096 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.229 mas

Total Proper Motion

9.415 mas/yr

PM Right Ascension

-9.38 mas/yr

PM Declination

0.85 mas/yr

Galactic Cartesian (pc)

x = 0.314 · y = -0.688 · z = 0.654

Equatorial (J2000)

RA 294.55779° · Dec 40.85049°

Galactic ℓ, b

74.290° · 9.309°

Ecliptic λ, β

310.270° · 60.901°

HTM-20 index

1548405093