Key parameters at a glance

A radius of 2.71 Earth radii
A mass of 7.80 Earth masses
Surface gravity around 1.06 g
An orbital period of 46.406 days
Semi-major axis 0.2570 AU
Equilibrium temperature 588 K (315 °C)
Distance from Earth 2,454.53 light-years
Earth Similarity Index 0.415
Travel time at Voyager 1 speed 43,285,566 years

Kepler-655 b Planet Profile

Physical Specs

Radius

2.71 R⊕

Radius (Jupiter)

0.242 R♃

Mass

7.80 M⊕

Mass (Jupiter)

0.025 M♃

Density

2.15 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.415

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

#849of 1978

top 42.9%

This planet

2.71R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-48 c 2.71 R⊕ Kepler-355 c 2.71 R⊕ Kepler-233 c 2.71 R⊕

Metric	Earth	Kepler-655 b	Jupiter
Radius (R⊕)	1.00	2.71	11.21
Mass (M⊕)	1.00	7.80	317.83
Density (g/cm³)	5.51	2.15	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	28.77	0.037

Star Catalogue Identifiers

TIC

TIC 273044848

Gaia DR2

Gaia DR2 2080355615570219904

Gaia DR3

Gaia DR3 2080355615570219904

System

Kepler-655

Percentile among Sub-Neptune cohort

Radius 2.710 R⊕ · percentile 57 / cohort 1978

Mass 7.800 M⊕ · percentile 52 / cohort 1978

Orbital period 46.41 d · percentile 84 / cohort 1946

Distance 752.56 pc · percentile 62 / cohort 1975

ESI 0.415 · percentile 55 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

46.406 days

Semi-major axis

0.2570 AU

Eccentricity

0.000

Inclination

89.98 °

Year Length

A year here lasts approximately 46.41 Earth days (12.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2570 AU.

Transit Fingerprint

Depth

0.047 %

Duration

6.994 h

Impact parameter b

0.843

Rp / R★

0.020014

Transit midpoint (BJD)

2,455,025.9955

Photometric dip

Transit produces a flux drop of 474 ppm lasting ≈ 6.99 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020014

Semi-major axis / stellar radius

51.440

Impact parameter (b)

0.843

Transit mid-time (BJD)

2,455,025.9955

Angular separation (arcsec)

0.34100

Eq. Temperature

588K

(315 °C)

Insolation (S⊕)

28.77

Earth = 1.00

Earth Similarity (ESI)

0.415

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-655

Spectral Class

F-type yellow-white

Effective Temperature

6,170 K — hotter than the Sun (5,778 K)

Estimated Age

3.39 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.240 R☉

Stellar Mass

1.150 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.310 dex

Stellar density

0.640 g/cm³

Metallicity ratio

[Fe/H]

Distance

752.56 parsec

Light-years 2,454.53 ly

V-band magnitude

13.57 mag

Voyager-speed travel 43,285,566 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.300 mas

Total Proper Motion

13.294 mas/yr

PM Right Ascension

-9.59 mas/yr

PM Declination

-9.21 mas/yr

Galactic Cartesian (pc)

x = 0.313 · y = -0.608 · z = 0.729

Equatorial (J2000)

RA 297.25907° · Dec 46.84317°

Galactic ℓ, b

80.581° · 10.442°

Ecliptic λ, β

319.483° · 65.665°

HTM-20 index

1118320356