Key parameters at a glance

A radius of 5.38 Earth radii
A mass of 25.00 Earth masses
Surface gravity around 0.86 g
An orbital period of 6.575 days
Semi-major axis 0.0670 AU
Equilibrium temperature 1,015 K (742 °C)
Distance from Earth 6,373.35 light-years
Earth Similarity Index 0.178
Travel time at Voyager 1 speed 112,394,006 years

Kepler-677 b Planet Profile

Physical Specs

Radius

5.38 R⊕

Radius (Jupiter)

0.480 R♃

Mass

25.00 M⊕

Mass (Jupiter)

0.079 M♃

Density

0.88 g/cm³

Surface Gravity

0.86 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.178

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

#331of 574

top 57.5%

This planet

5.38R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 11964 c 5.38 R⊕ HD 10180 e 5.39 R⊕ Kepler-1737 b 5.40 R⊕

Metric	Earth	Kepler-677 b	Jupiter
Radius (R⊕)	1.00	5.38	11.21
Mass (M⊕)	1.00	25.00	317.83
Density (g/cm³)	5.51	0.88	1.33
Surface Gravity (g)	1.00	0.86	2.53
Insolation (S⊕)	1.00	683.27	0.037

Star Catalogue Identifiers

TIC

TIC 267746941

Gaia DR2

Gaia DR2 2133056376115838080

Gaia DR3

Gaia DR3 2133056376115838080

System

Kepler-677

Percentile among Neptune-like cohort

Radius 5.380 R⊕ · percentile 42 / cohort 574

Mass 25.000 M⊕ · percentile 42 / cohort 574

Orbital period 6.58 d · percentile 27 / cohort 524

Distance 1,954.08 pc · percentile 89 / cohort 572

ESI 0.178 · percentile 22 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

6.575 days

Semi-major axis

0.0670 AU

Eccentricity

0.000

Inclination

88.03 °

Year Length

A year here lasts approximately 6.58 Earth days (1.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0670 AU.

Transit Fingerprint

Depth

0.279 %

Duration

4.284 h

Impact parameter b

0.300

Rp / R★

0.049778

Transit midpoint (BJD)

2,455,006.6343

Photometric dip

Transit produces a flux drop of 2,793 ppm lasting ≈ 4.28 h.

Extended Orbital Architecture

Planet / star radius ratio

0.049778

Semi-major axis / stellar radius

12.325

Impact parameter (b)

0.300

Transit mid-time (BJD)

2,455,006.6343

Angular separation (arcsec)

0.03430

Eq. Temperature

1,015K

(742 °C)

Insolation (S⊕)

683.27

Earth = 1.00

Earth Similarity (ESI)

0.178

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-677

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,723 K — cooler than the Sun (5,778 K)

Estimated Age

4.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.990 R☉

Stellar Mass

1.000 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.450 dex

Stellar density

0.819 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,954.08 parsec

Light-years 6,373.35 ly

V-band magnitude

15.50 mag

Voyager-speed travel 112,394,006 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.482 mas

Total Proper Motion

10.911 mas/yr

PM Right Ascension

-5.24 mas/yr

PM Declination

-9.57 mas/yr

Galactic Cartesian (pc)

x = 0.219 · y = -0.600 · z = 0.770

Equatorial (J2000)

RA 290.09805° · Dec 50.32157°

Galactic ℓ, b

81.659° · 16.221°

Ecliptic λ, β

311.960° · 70.846°

HTM-20 index

94798934