Key parameters at a glance

A radius of 2.51 Earth radii
A mass of 6.85 Earth masses
Surface gravity around 1.09 g
An orbital period of 8.597 days
Semi-major axis 0.0834 AU
Equilibrium temperature 1,001 K (728 °C)
Distance from Earth 980.56 light-years
Earth Similarity Index 0.249
Travel time at Voyager 1 speed 17,292,093 years

K2-214 b Planet Profile

Physical Specs

Radius

2.51 R⊕

Radius (Jupiter)

0.224 R♃

Mass

6.85 M⊕

Mass (Jupiter)

0.022 M♃

Density

2.38 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.249

HZ Position Inner

Controversial No

Discovery

Year 2018

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1159of 1978

top 58.5%

This planet

2.51R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 876 d 2.51 R⊕ Kepler-239 c 2.51 R⊕ Kepler-445 c 2.51 R⊕

Metric	Earth	K2-214 b	Jupiter
Radius (R⊕)	1.00	2.51	11.21
Mass (M⊕)	1.00	6.85	317.83
Density (g/cm³)	5.51	2.38	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	238.00	0.037

Star Catalogue Identifiers

TIC

TIC 344657681

Gaia DR2

Gaia DR2 2551946391916754176

Gaia DR3

Gaia DR3 2551946391916754176

System

K2-214

Percentile among Sub-Neptune cohort

Radius 2.510 R⊕ · percentile 41 / cohort 1978

Mass 6.850 M⊕ · percentile 38 / cohort 1978

Orbital period 8.60 d · percentile 28 / cohort 1946

Distance 300.64 pc · percentile 35 / cohort 1975

ESI 0.249 · percentile 16 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.597 days

Semi-major axis

0.0834 AU

Eccentricity

—

Inclination

88.15 °

Year Length

A year here lasts approximately 8.60 Earth days (2.4% of a terrestrial year) at a mean orbital distance of 0.0834 AU.

Transit Fingerprint

Depth

0.040 %

Duration

3.730 h

Impact parameter b

0.390

Rp / R★

0.017600

Transit midpoint (BJD)

2,457,396.6009

Photometric dip

Transit produces a flux drop of 400 ppm lasting ≈ 3.73 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017600

Semi-major axis / stellar radius

16.180

Impact parameter (b)

0.390

Transit mid-time (BJD)

2,457,396.6009

Angular separation (arcsec)

0.27700

Eq. Temperature

1,001K

(728 °C)

Insolation (S⊕)

238.00

Earth = 1.00

Earth Similarity (ESI)

0.249

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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: K2-214

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,875 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.236 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.280 dex

Stellar density

1.080 g/cm³

Systemic radial velocity

-17.07 km/s

Rotational v·sin i

1.90 km/s

Activity index (log R'HK)

-5.112

Metallicity ratio

[Fe/H]

Distance

300.64 parsec

Light-years 980.56 ly

V-band magnitude

11.81 mag

Voyager-speed travel 17,292,093 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

3.298 mas

Total Proper Motion

30.823 mas/yr

PM Right Ascension

-25.32 mas/yr

PM Declination

-17.57 mas/yr

Galactic Cartesian (pc)

x = 0.964 · y = 0.256 · z = 0.074

Equatorial (J2000)

RA 14.87598° · Dec 4.22777°

Galactic ℓ, b

126.792° · -58.584°

Ecliptic λ, β

15.326° · -1.960°

HTM-20 index

-231708591