Key parameters at a glance

A radius of 1.51 Earth radii
A mass of 2.89 Earth masses
Surface gravity around 1.27 g
An orbital period of 2.756 days
Semi-major axis 0.0320 AU
Equilibrium temperature 757 K (484 °C)
Distance from Earth 520.94 light-years
Earth Similarity Index 0.399
Travel time at Voyager 1 speed 9,186,712 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around Kepler-205

Kepler-205 b 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-205 b this	Super-Earth	1.51	2.89	2.756	757	2014
Kepler-205 c	Super-Earth	1.64	3.33	20.307	389	2014

Kepler-205 b Planet Profile

Physical Specs

Radius

1.51 R⊕

Radius (Jupiter)

0.135 R♃

Mass

2.89 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.61 g/cm³

Surface Gravity

1.27 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.399

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#730of 1176

top 62.0%

This planet

1.51R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

K2-138 b 1.51 R⊕ Kepler-249 c 1.51 R⊕ Kepler-389 b 1.51 R⊕

Metric	Earth	Kepler-205 b	Jupiter
Radius (R⊕)	1.00	1.51	11.21
Mass (M⊕)	1.00	2.89	317.83
Density (g/cm³)	5.51	4.61	1.33
Surface Gravity (g)	1.00	1.27	2.53
Insolation (S⊕)	1.00	102.56	0.037

Star Catalogue Identifiers

TIC

TIC 399822422

Gaia DR2

Gaia DR2 2104076204545773440

Gaia DR3

Gaia DR3 2104076204545773440

System

Kepler-205

Percentile among Super-Earth cohort

Radius 1.510 R⊕ · percentile 37 / cohort 1176

Mass 2.890 M⊕ · percentile 34 / cohort 1176

Orbital period 2.76 d · percentile 19 / cohort 1164

Distance 159.72 pc · percentile 21 / cohort 1171

ESI 0.399 · percentile 60 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

2.756 days

Semi-major axis

0.0320 AU

Eccentricity

0.000

Inclination

85.06 °

Year Length

A year here lasts approximately 2.76 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0320 AU.

Transit Fingerprint

Depth

0.055 %

Duration

1.948 h

Impact parameter b

0.870

Rp / R★

0.024300

Transit midpoint (BJD)

2,455,003.8445

Photometric dip

Transit produces a flux drop of 546 ppm lasting ≈ 1.95 h.

Extended Orbital Architecture

Planet / star radius ratio

0.024300

Semi-major axis / stellar radius

6.800

Impact parameter (b)

0.870

Transit mid-time (BJD)

2,455,003.8445

Angular separation (arcsec)

0.20000

Eq. Temperature

757K

(484 °C)

Insolation (S⊕)

102.56

Earth = 1.00

Earth Similarity (ESI)

0.399

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-205

Spectral Class

M-type red dwarf

Effective Temperature

4,321 K — cooler than the Sun (5,778 K)

Estimated Age

4.42 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.546 R☉

Stellar Mass

0.592 M☉

Metallicity [Fe/H]

-0.13

Extended Stellar Properties

Surface gravity (log g)

4.735 dex

Stellar density

1.977 g/cm³

Systemic radial velocity

44.12 km/s

Metallicity ratio

[M/H]

Distance

159.72 parsec

Light-years 520.94 ly

V-band magnitude

13.78 mag

Voyager-speed travel 9,186,712 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

6.232 mas

Total Proper Motion

89.082 mas/yr

PM Right Ascension

-72.61 mas/yr

PM Declination

-51.60 mas/yr

Galactic Cartesian (pc)

x = 0.196 · y = -0.718 · z = 0.667

Equatorial (J2000)

RA 285.28669° · Dec 41.86094°

Galactic ℓ, b

72.198° · 16.035°

Ecliptic λ, β

296.505° · 63.900°

HTM-20 index

2144272227