Key parameters at a glance

A radius of 2.70 Earth radii
A mass of 7.76 Earth masses
Surface gravity around 1.06 g
An orbital period of 22.064 days
Semi-major axis 0.1599 AU
Equilibrium temperature 712 K (439 °C)
Distance from Earth 2,398.45 light-years
Earth Similarity Index 0.345
Travel time at Voyager 1 speed 42,296,665 years

Kepler-1677 b Planet Profile

Physical Specs

Radius

2.70 R⊕

Radius (Jupiter)

0.241 R♃

Mass

7.76 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.16 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.345

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#863of 1978

top 43.6%

This planet

2.70R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-712 c 2.70 R⊕ Kepler-1807 b 2.70 R⊕ Kepler-1785 b 2.70 R⊕

Metric	Earth	Kepler-1677 b	Jupiter
Radius (R⊕)	1.00	2.70	11.21
Mass (M⊕)	1.00	7.76	317.83
Density (g/cm³)	5.51	2.16	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	59.40	0.037

Star Catalogue Identifiers

TIC

TIC 274198958

Gaia DR2

Gaia DR2 2085575272147044608

Gaia DR3

Gaia DR3 2085575272147044608

System

Kepler-1677

Percentile among Sub-Neptune cohort

Radius 2.702 R⊕ · percentile 56 / cohort 1978

Mass 7.760 M⊕ · percentile 52 / cohort 1978

Orbital period 22.06 d · percentile 66 / cohort 1946

Distance 735.37 pc · percentile 61 / cohort 1975

ESI 0.345 · percentile 39 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

22.064 days

Semi-major axis

0.1599 AU

Eccentricity

0.000

Inclination

86.73 °

Year Length

A year here lasts approximately 22.06 Earth days (6.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1599 AU.

Transit Fingerprint

Depth

0.039 %

Duration

3.493 h

Impact parameter b

0.195

Rp / R★

0.018467

Transit midpoint (BJD)

2,454,981.9172

Photometric dip

Transit produces a flux drop of 389 ppm lasting ≈ 3.49 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018467

Semi-major axis / stellar radius

48.240

Impact parameter (b)

0.195

Transit mid-time (BJD)

2,454,981.9172

Angular separation (arcsec)

0.21700

Eq. Temperature

712K

(439 °C)

Insolation (S⊕)

59.40

Earth = 1.00

Earth Similarity (ESI)

0.345

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

Armstrong et al. 2021

Instrument

Kepler CCD Array

Publication

2021-07

Observation locale

Space

Discovery cohort

Planets confirmed in 2020 at Kepler (12 shown).

Kepler-1649 c · Rocky Terrestrial Kepler-1701 b · Sub-Neptune Kepler-1690 b · Sub-Neptune Kepler-1700 b · Sub-Neptune Kepler-1684 b · Sub-Neptune Kepler-1678 b · Sub-Neptune Kepler-598 c · Sub-Neptune Kepler-1661 b · Sub-Neptune Kepler-1663 b · Sub-Neptune Kepler-1681 b · Sub-Neptune Kepler-1672 b · Sub-Neptune Kepler-1702 b · Super-Earth

Host System: Kepler-1677

Spectral Class

F-type yellow-white

Effective Temperature

6,014 K — hotter than the Sun (5,778 K)

Estimated Age

2.29 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.250 R☉

Stellar Mass

1.110 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.290 dex

Stellar density

0.802 g/cm³

Metallicity ratio

[M/H]

Distance

735.37 parsec

Light-years 2,398.45 ly

V-band magnitude

13.81 mag

Voyager-speed travel 42,296,665 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.331 mas

Total Proper Motion

3.990 mas/yr

PM Right Ascension

-0.12 mas/yr

PM Declination

3.99 mas/yr

Galactic Cartesian (pc)

x = 0.325 · y = -0.599 · z = 0.732

Equatorial (J2000)

RA 298.49327° · Dec 47.01306°

Galactic ℓ, b

81.149° · 9.789°

Ecliptic λ, β

321.487° · 65.438°

HTM-20 index

234794163