Key parameters at a glance

A radius of 2.24 Earth radii
A mass of 5.65 Earth masses
Surface gravity around 1.13 g
An orbital period of 52.662 days
Semi-major axis 0.2420 AU
Equilibrium temperature 286 K (13 °C)
Distance from Earth 957.26 light-years
Earth Similarity Index 0.797
Travel time at Voyager 1 speed 16,881,360 years

1 sibling around Kepler-155

Kepler-155 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-155 b	Sub-Neptune	2.09	5.02	5.931	614	2014
Kepler-155 c this	Sub-Neptune	2.24	5.65	52.662	286	2014

Kepler-155 c Planet Profile

Physical Specs

Radius

2.24 R⊕

Radius (Jupiter)

0.200 R♃

Mass

5.65 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.76 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.797

HZ Position Habitable

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1607of 1978

top 81.2%

This planet

2.24R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-69 b 2.24 R⊕ Kepler-284 b 2.24 R⊕ Kepler-196 c 2.24 R⊕

Metric	Earth	Kepler-155 c	Jupiter
Radius (R⊕)	1.00	2.24	11.21
Mass (M⊕)	1.00	5.65	317.83
Density (g/cm³)	5.51	2.76	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	1.28	0.037

Star Catalogue Identifiers

TIC

TIC 298969755

Gaia DR2

Gaia DR2 2133351698066484096

Gaia DR3

Gaia DR3 2133351698066484096

System

Kepler-155

Percentile among Sub-Neptune cohort

Radius 2.240 R⊕ · percentile 18 / cohort 1978

Mass 5.650 M⊕ · percentile 18 / cohort 1978

Orbital period 52.66 d · percentile 86 / cohort 1946

Distance 293.50 pc · percentile 34 / cohort 1975

ESI 0.797 · percentile 100 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

52.662 days

Semi-major axis

0.2420 AU

Eccentricity

0.000

Inclination

89.50 °

Year Length

A year here lasts approximately 52.66 Earth days (14.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2420 AU.

Transit Fingerprint

Depth

0.109 %

Duration

3.188 h

Impact parameter b

0.780

Rp / R★

0.034310

Transit midpoint (BJD)

2,455,016.5168

Photometric dip

Transit produces a flux drop of 1,088 ppm lasting ≈ 3.19 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034310

Semi-major axis / stellar radius

88.720

Impact parameter (b)

0.780

Transit mid-time (BJD)

2,455,016.5168

Angular separation (arcsec)

0.82500

Eq. Temperature

286K

(13 °C)

Insolation (S⊕)

1.28

Earth = 1.00

Earth Similarity (ESI)

0.797

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — liquid water is physically possible with adequate atmospheric pressure.

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune Kepler-220 d · Rocky Terrestrial

Host System: Kepler-155

Spectral Class

M-type red dwarf

Effective Temperature

4,508 K — cooler than the Sun (5,778 K)

Estimated Age

2.90 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.620 R☉

Stellar Mass

0.635 M☉

Metallicity [Fe/H]

-0.14

Extended Stellar Properties

Surface gravity (log g)

4.684 dex

Stellar density

1.008 g/cm³

Rotation period

26.43 days

Metallicity ratio

[M/H]

Distance

293.50 parsec

Light-years 957.26 ly

V-band magnitude

14.65 mag

Voyager-speed travel 16,881,360 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.379 mas

Total Proper Motion

8.848 mas/yr

PM Right Ascension

-5.35 mas/yr

PM Declination

-7.05 mas/yr

Galactic Cartesian (pc)

x = 0.199 · y = -0.596 · z = 0.778

Equatorial (J2000)

RA 288.49578° · Dec 51.08193°

Galactic ℓ, b

81.987° · 17.449°

Ecliptic λ, β

310.043° · 71.957°

HTM-20 index

213539482