Key parameters at a glance

A radius of 2.80 Earth radii
A mass of 8.22 Earth masses
Surface gravity around 1.05 g
An orbital period of 18.295 days
Distance from Earth 797.27 light-years
Earth Similarity Index 0.664
Travel time at Voyager 1 speed 14,059,777 years
Almost certainly tidally locked to its host star given the close orbit

K2-206 b Planet Profile

Physical Specs

Radius

2.80 R⊕

Radius (Jupiter)

0.249 R♃

Mass

8.22 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.07 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.664

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

#752of 1978

top 38.0%

This planet

2.80R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-529 d 2.80 R⊕ Kepler-1784 b 2.80 R⊕ Kepler-276 d 2.80 R⊕

Metric	Earth	K2-206 b	Jupiter
Radius (R⊕)	1.00	2.80	11.21
Mass (M⊕)	1.00	8.22	317.83
Density (g/cm³)	5.51	2.07	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 257392778

Gaia DR2

Gaia DR2 2549096011101118080

Gaia DR3

Gaia DR3 2549096011101118080

System

K2-206

Percentile among Sub-Neptune cohort

Radius 2.795 R⊕ · percentile 62 / cohort 1978

Mass 8.220 M⊕ · percentile 57 / cohort 1978

Orbital period 18.29 d · percentile 59 / cohort 1946

Distance 244.44 pc · percentile 31 / cohort 1975

ESI 0.664 · percentile 89 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

18.295 days

Semi-major axis

— AU

Eccentricity

—

Inclination

89.11 °

Year Length

A year here lasts approximately 18.29 Earth days (5.0% of a terrestrial year).

Transit Fingerprint

Rp / R★

0.033806

Transit midpoint (BJD)

2,457,396.5766

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.664

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

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: K2-206

Spectral Class

K-type orange

Effective Temperature

5,043 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.758 R☉

Stellar Mass

0.789 M☉

Metallicity [Fe/H]

-0.14

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

2.394 g/cm³

Systemic radial velocity

27.24 km/s

Metallicity ratio

[Fe/H]

Distance

244.44 parsec

Light-years 797.27 ly

V-band magnitude

13.08 mag

Voyager-speed travel 14,059,777 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

4.063 mas

Total Proper Motion

31.499 mas/yr

PM Right Ascension

25.89 mas/yr

PM Declination

-17.95 mas/yr

Galactic Cartesian (pc)

x = 0.981 · y = 0.195 · z = 0.010

Equatorial (J2000)

RA 11.25643° · Dec 0.59319°

Galactic ℓ, b

119.489° · -62.236°

Ecliptic λ, β

10.577° · -3.907°

HTM-20 index

19818500

Similar Worlds

HD 73583 b

Sub-Neptune · K-type orange

Radius 2.79 R⊕ · 103.0 ly

Kepler-152 b

Sub-Neptune · K-type orange

Radius 2.79 R⊕ · 1,438.6 ly

Kepler-1996 c

Sub-Neptune · K-type orange

Radius 2.81 R⊕ · 1,436.9 ly

Kepler-1234 b

Sub-Neptune · K-type orange

Radius 2.81 R⊕ · 2,990.0 ly

Kepler-892 b

Sub-Neptune · K-type orange

Radius 2.81 R⊕ · 1,861.5 ly

Kepler-1669 b

Sub-Neptune · K-type orange

Radius 2.78 R⊕ · 1,772.5 ly

Explore Related Categories

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