Key parameters at a glance

A radius of 1.67 Earth radii
A mass of 3.41 Earth masses
Surface gravity around 1.23 g
An orbital period of 13.622 days
Distance from Earth 610.67 light-years
Earth Similarity Index 0.853
Travel time at Voyager 1 speed 10,769,252 years

K2-227 b Planet Profile

Physical Specs

Radius

1.67 R⊕

Radius (Jupiter)

0.149 R♃

Mass

3.41 M⊕

Mass (Jupiter)

0.011 M♃

Density

4.06 g/cm³

Surface Gravity

1.23 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.853

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

#464of 1176

top 39.4%

This planet

1.67R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

K2-172 b 1.67 R⊕ TOI-871 b 1.66 R⊕ HD 136352 b 1.66 R⊕

Metric	Earth	K2-227 b	Jupiter
Radius (R⊕)	1.00	1.67	11.21
Mass (M⊕)	1.00	3.41	317.83
Density (g/cm³)	5.51	4.06	1.33
Surface Gravity (g)	1.00	1.23	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 156599123

Gaia DR2

Gaia DR2 3675261140764265728

Gaia DR3

Gaia DR3 3675261140764265728

System

K2-227

Percentile among Super-Earth cohort

Radius 1.666 R⊕ · percentile 61 / cohort 1176

Mass 3.410 M⊕ · percentile 55 / cohort 1176

Orbital period 13.62 d · percentile 74 / cohort 1164

Distance 187.23 pc · percentile 23 / cohort 1171

ESI 0.853 · percentile 94 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

13.622 days

Semi-major axis

— AU

Eccentricity

—

Inclination

88.37 °

Year Length

A year here lasts approximately 13.62 Earth days (3.7% of a terrestrial year).

Transit Fingerprint

Rp / R★

0.017144

Transit midpoint (BJD)

2,457,592.2383

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.853

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: K2-227

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,673 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.891 R☉

Stellar Mass

0.951 M☉

Metallicity [Fe/H]

-0.10

Extended Stellar Properties

Surface gravity (log g)

4.580 dex

Stellar density

1.664 g/cm³

Systemic radial velocity

2.74 km/s

Metallicity ratio

[Fe/H]

Distance

187.23 parsec

Light-years 610.67 ly

V-band magnitude

12.02 mag

Voyager-speed travel 10,769,252 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

5.313 mas

Total Proper Motion

33.955 mas/yr

PM Right Ascension

-17.30 mas/yr

PM Declination

-29.22 mas/yr

Galactic Cartesian (pc)

x = -0.971 · y = -0.188 · z = -0.147

Equatorial (J2000)

RA 190.94842° · Dec -8.47842°

Galactic ℓ, b

299.688° · 54.345°

Ecliptic λ, β

193.377° · -3.471°

HTM-20 index

1830451156