Key parameters at a glance

A radius of 2.42 Earth radii
A mass of 6.44 Earth masses
Surface gravity around 1.10 g
An orbital period of 3.690 days
Semi-major axis 0.0469 AU
Equilibrium temperature 1,147 K (874 °C)
Distance from Earth 4,867.81 light-years
Earth Similarity Index 0.218
Travel time at Voyager 1 speed 85,843,879 years

Kepler-680 b Planet Profile

Physical Specs

Radius

2.42 R⊕

Radius (Jupiter)

0.216 R♃

Mass

6.44 M⊕

Mass (Jupiter)

0.020 M♃

Density

2.50 g/cm³

Surface Gravity

1.10 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.218

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

#1299of 1978

top 65.6%

This planet

2.42R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 1461 b 2.42 R⊕ Kepler-717 b 2.42 R⊕ K2-43 c 2.42 R⊕

Metric	Earth	Kepler-680 b	Jupiter
Radius (R⊕)	1.00	2.42	11.21
Mass (M⊕)	1.00	6.44	317.83
Density (g/cm³)	5.51	2.50	1.33
Surface Gravity (g)	1.00	1.10	2.53
Insolation (S⊕)	1.00	706.62	0.037

Star Catalogue Identifiers

TIC

TIC 26473621

Gaia DR2

Gaia DR2 2130124528361197952

Gaia DR3

Gaia DR3 2130124528361197952

System

Kepler-680

Percentile among Sub-Neptune cohort

Radius 2.420 R⊕ · percentile 34 / cohort 1978

Mass 6.440 M⊕ · percentile 32 / cohort 1978

Orbital period 3.69 d · percentile 7 / cohort 1946

Distance 1,492.48 pc · percentile 93 / cohort 1975

ESI 0.218 · percentile 10 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.690 days

Semi-major axis

0.0469 AU

Eccentricity

0.000

Inclination

89.19 °

Year Length

A year here lasts approximately 3.69 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0469 AU.

Transit Fingerprint

Depth

0.043 %

Duration

2.629 h

Impact parameter b

0.117

Rp / R★

0.019622

Transit midpoint (BJD)

2,455,003.3646

Photometric dip

Transit produces a flux drop of 427 ppm lasting ≈ 2.63 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019622

Semi-major axis / stellar radius

10.879

Impact parameter (b)

0.117

Transit mid-time (BJD)

2,455,003.3646

Angular separation (arcsec)

0.03140

Eq. Temperature

1,147K

(874 °C)

Insolation (S⊕)

706.62

Earth = 1.00

Earth Similarity (ESI)

0.218

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-680

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,890 K — hotter than the Sun (5,778 K)

Estimated Age

3.72 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.110 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

0.13

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

1.708 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,492.48 parsec

Light-years 4,867.81 ly

V-band magnitude

15.32 mag

Voyager-speed travel 85,843,879 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.641 mas

Total Proper Motion

10.652 mas/yr

PM Right Ascension

-0.14 mas/yr

PM Declination

-10.65 mas/yr

Galactic Cartesian (pc)

x = 0.234 · y = -0.590 · z = 0.773

Equatorial (J2000)

RA 291.62238° · Dec 50.61818°

Galactic ℓ, b

82.346° · 15.451°

Ecliptic λ, β

315.007° · 70.696°

HTM-20 index

145866351