Key parameters at a glance

A radius of 2.00 Earth radii
A mass of 4.64 Earth masses
Surface gravity around 1.17 g
An orbital period of 26.672 days
Distance from Earth 1,321.91 light-years
Earth Similarity Index 0.786
Travel time at Voyager 1 speed 23,311,944 years

K2-205 b Planet Profile

Physical Specs

Radius

2.00 R⊕

Radius (Jupiter)

0.178 R♃

Mass

4.64 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.21 g/cm³

Surface Gravity

1.17 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.786

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1of 1176

top 0.0%

This planet

2.00R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

TOI-733 b 1.99 R⊕ Kepler-1928 b 1.99 R⊕ K2-62 c 1.99 R⊕

Metric	Earth	K2-205 b	Jupiter
Radius (R⊕)	1.00	2.00	11.21
Mass (M⊕)	1.00	4.64	317.83
Density (g/cm³)	5.51	3.21	1.33
Surface Gravity (g)	1.00	1.17	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 344661825

Gaia DR2

Gaia DR2 2536584771367726336

Gaia DR3

Gaia DR3 2536584771367726336

System

K2-205

Percentile among Super-Earth cohort

Radius 1.996 R⊕ · percentile 100 / cohort 1176

Mass 4.640 M⊕ · percentile 91 / cohort 1176

Orbital period 26.67 d · percentile 90 / cohort 1164

Distance 405.30 pc · percentile 40 / cohort 1171

ESI 0.786 · percentile 88 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

26.672 days

Semi-major axis

— AU

Eccentricity

—

Inclination

89.10 °

Year Length

A year here lasts approximately 26.67 Earth days (7.3% of a terrestrial year).

Transit Fingerprint

Depth

0.029 %

Duration

6.048 h

Rp / R★

0.016978

Transit midpoint (BJD)

2,457,413.4191

Photometric dip

Transit produces a flux drop of 291 ppm lasting ≈ 6.05 h.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.786

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mayo et al. 2018

Instrument

Kepler CCD Array

Publication

2018-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2018 at K2 (12 shown).

K2-190 c · Rocky Terrestrial K2-183 b · Rocky Terrestrial K2-209 b · Rocky Terrestrial K2-210 b · Rocky Terrestrial K2-165 b · Super-Earth K2-169 b · Super-Earth K2-148 b · Super-Earth K2-219 b · Super-Earth K2-190 b · Super-Earth K2-200 b · Super-Earth K2-201 b · Super-Earth K2-170 b · Super-Earth

Host System: K2-205

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,890 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.078 R☉

Stellar Mass

0.951 M☉

Metallicity [Fe/H]

-0.26

Extended Stellar Properties

Surface gravity (log g)

4.250 dex

Stellar density

0.755 g/cm³

Systemic radial velocity

19.70 km/s

Metallicity ratio

[Fe/H]

Distance

405.30 parsec

Light-years 1,321.91 ly

V-band magnitude

12.45 mag

Voyager-speed travel 23,311,944 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

2.439 mas

Total Proper Motion

25.344 mas/yr

PM Right Ascension

23.96 mas/yr

PM Declination

-8.27 mas/yr

Galactic Cartesian (pc)

x = 0.965 · y = 0.262 · z = 0.007

Equatorial (J2000)

RA 15.21759° · Dec 0.42597°

Galactic ℓ, b

128.019° · -62.353°

Ecliptic λ, β

14.175° · -5.600°

HTM-20 index

2003977224