Key parameters at a glance

A radius of 2.10 Earth radii
A mass of 5.06 Earth masses
Surface gravity around 1.15 g
An orbital period of 27.359 days
Semi-major axis 0.1768 AU
Equilibrium temperature 347 K (74 °C)
Distance from Earth 248.36 light-years
Earth Similarity Index 0.716
Travel time at Voyager 1 speed 4,379,885 years
Almost certainly tidally locked to its host star given the close orbit

K2-286 b Planet Profile

Physical Specs

Radius

2.10 R⊕

Radius (Jupiter)

0.187 R♃

Mass

5.06 M⊕

Mass (Jupiter)

0.016 M♃

Density

3.00 g/cm³

Surface Gravity

1.15 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.716

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

#1818of 1978

top 91.9%

This planet

2.10R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-5734 b 2.10 R⊕ Kepler-52 b 2.10 R⊕ Kepler-360 c 2.10 R⊕

Metric	Earth	K2-286 b	Jupiter
Radius (R⊕)	1.00	2.10	11.21
Mass (M⊕)	1.00	5.06	317.83
Density (g/cm³)	5.51	3.00	1.33
Surface Gravity (g)	1.00	1.15	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 297373047

Gaia DR2

Gaia DR2 6264513270727342080

Gaia DR3

Gaia DR3 6264513270727342080

System

K2-286

Percentile among Sub-Neptune cohort

Radius 2.100 R⊕ · percentile 7 / cohort 1978

Mass 5.060 M⊕ · percentile 9 / cohort 1978

Orbital period 27.36 d · percentile 71 / cohort 1946

Distance 76.15 pc · percentile 16 / cohort 1975

ESI 0.716 · percentile 94 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

27.359 days

Semi-major axis

0.1768 AU

Eccentricity

—

Inclination

89.67 °

Year Length

A year here lasts approximately 27.36 Earth days (7.5% of a terrestrial year) at a mean orbital distance of 0.1768 AU.

Transit Fingerprint

Depth

0.112 %

Duration

3.000 h

Impact parameter b

0.350

Rp / R★

0.031500

Transit midpoint (BJD)

2,458,010.4170

Photometric dip

Transit produces a flux drop of 1,120 ppm lasting ≈ 3.00 h.

Extended Orbital Architecture

Planet / star radius ratio

0.031500

Semi-major axis / stellar radius

63.000

Impact parameter (b)

0.350

Transit mid-time (BJD)

2,458,010.4170

Angular separation (arcsec)

2.32000

Eq. Temperature

347K

(74 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.716

0 = alien, 1 = Earth-identical

Insufficient insolation data — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

D Iacute Ez Alonso et al. 2019

Instrument

Kepler CCD Array

Publication

2019-11

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: K2-286

Spectral Class

M-type red dwarf

Effective Temperature

3,926 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.620 R☉

Stellar Mass

0.640 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.700 dex

Stellar density

3.413 g/cm³

Systemic radial velocity

-17.41 km/s

Rotation period

23.80 days

Metallicity ratio

[Fe/H]

Distance

76.15 parsec

Light-years 248.36 ly

V-band magnitude

12.88 mag

Voyager-speed travel 4,379,885 yr

Multi-band Host Photometry — 13 bands

Astrometric Data

Parallax

13.104 mas

Total Proper Motion

120.426 mas/yr

PM Right Ascension

57.81 mas/yr

PM Declination

-105.65 mas/yr

Galactic Cartesian (pc)

x = -0.571 · y = -0.768 · z = -0.289

Equatorial (J2000)

RA 233.36982° · Dec -16.77371°

Galactic ℓ, b

349.501° · 31.082°

Ecliptic λ, β

235.125° · 2.342°

HTM-20 index

-137889737