Key parameters at a glance

A radius of 2.56 Earth radii
A mass of 7.08 Earth masses
Surface gravity around 1.08 g
An orbital period of 22.248 days
Semi-major axis 0.1542 AU
Equilibrium temperature 609 K (336 °C)
Distance from Earth 1,819.26 light-years
Earth Similarity Index 0.411
Travel time at Voyager 1 speed 32,082,574 years

Kepler-640 b Planet Profile

Physical Specs

Radius

2.56 R⊕

Radius (Jupiter)

0.228 R♃

Mass

7.08 M⊕

Mass (Jupiter)

0.022 M♃

Density

2.32 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.411

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

#1092of 1978

top 55.2%

This planet

2.56R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-171 c 2.56 R⊕ Kepler-106 e 2.56 R⊕ Kepler-175 b 2.56 R⊕

Metric	Earth	Kepler-640 b	Jupiter
Radius (R⊕)	1.00	2.56	11.21
Mass (M⊕)	1.00	7.08	317.83
Density (g/cm³)	5.51	2.32	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	35.06	0.037

Star Catalogue Identifiers

TIC

TIC 272180958

Gaia DR2

Gaia DR2 2077119748545602304

Gaia DR3

Gaia DR3 2077119748545602304

System

Kepler-640

Percentile among Sub-Neptune cohort

Radius 2.560 R⊕ · percentile 44 / cohort 1978

Mass 7.080 M⊕ · percentile 41 / cohort 1978

Orbital period 22.25 d · percentile 66 / cohort 1946

Distance 557.79 pc · percentile 50 / cohort 1975

ESI 0.411 · percentile 55 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

22.248 days

Semi-major axis

0.1542 AU

Eccentricity

0.000

Inclination

87.79 °

Year Length

A year here lasts approximately 22.25 Earth days (6.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1542 AU.

Transit Fingerprint

Depth

0.061 %

Duration

3.957 h

Impact parameter b

0.753

Rp / R★

0.025228

Transit midpoint (BJD)

2,455,007.1366

Photometric dip

Transit produces a flux drop of 614 ppm lasting ≈ 3.96 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025228

Semi-major axis / stellar radius

22.500

Impact parameter (b)

0.753

Transit mid-time (BJD)

2,455,007.1366

Angular separation (arcsec)

0.27600

Eq. Temperature

609K

(336 °C)

Insolation (S⊕)

35.06

Earth = 1.00

Earth Similarity (ESI)

0.411

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

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-640

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,653 K — cooler than the Sun (5,778 K)

Estimated Age

2.09 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.940 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

1.100 g/cm³

Metallicity ratio

[Fe/H]

Distance

557.79 parsec

Light-years 1,819.26 ly

V-band magnitude

13.89 mag

Voyager-speed travel 32,082,574 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.764 mas

Total Proper Motion

14.998 mas/yr

PM Right Ascension

0.94 mas/yr

PM Declination

14.97 mas/yr

Galactic Cartesian (pc)

x = 0.325 · y = -0.666 · z = 0.671

Equatorial (J2000)

RA 296.03220° · Dec 42.13174°

Galactic ℓ, b

75.963° · 8.945°

Ecliptic λ, β

313.366° · 61.708°

HTM-20 index

1357735049