Key parameters at a glance

A radius of 2.58 Earth radii
A mass of 7.16 Earth masses
Surface gravity around 1.08 g
An orbital period of 11.137 days
Distance from Earth 1,061.31 light-years
Earth Similarity Index 0.693
Travel time at Voyager 1 speed 18,716,229 years

2 siblings around K2-219

K2-219 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
K2-219 b	Super-Earth	1.35	2.38	3.901	—	2018
K2-219 c	Super-Earth	1.44	2.66	6.668	—	2018
K2-219 d this	Sub-Neptune	2.58	7.16	11.137	—	2018

K2-219 d Planet Profile

Physical Specs

Radius

2.58 R⊕

Radius (Jupiter)

0.230 R♃

Mass

7.16 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.30 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.693

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

#1071of 1978

top 54.1%

This planet

2.58R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1685 b 2.58 R⊕ K2-195 c 2.58 R⊕ BD+20 594 b 2.58 R⊕

Metric	Earth	K2-219 d	Jupiter
Radius (R⊕)	1.00	2.58	11.21
Mass (M⊕)	1.00	7.16	317.83
Density (g/cm³)	5.51	2.30	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 266014079

Gaia DR2

Gaia DR2 2581741400387500544

Gaia DR3

Gaia DR3 2581741400387500544

System

K2-219

Percentile among Sub-Neptune cohort

Radius 2.576 R⊕ · percentile 46 / cohort 1978

Mass 7.160 M⊕ · percentile 43 / cohort 1978

Orbital period 11.14 d · percentile 39 / cohort 1946

Distance 325.40 pc · percentile 37 / cohort 1975

ESI 0.693 · percentile 92 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

11.137 days

Semi-major axis

— AU

Eccentricity

—

Inclination

88.29 °

Year Length

A year here lasts approximately 11.14 Earth days (3.0% of a terrestrial year).

Transit Fingerprint

Depth

0.042 %

Duration

4.896 h

Rp / R★

0.019861

Transit midpoint (BJD)

2,457,404.5943

Photometric dip

Transit produces a flux drop of 419 ppm lasting ≈ 4.90 h.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.693

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: K2-219

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,753 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.189 R☉

Stellar Mass

1.022 M☉

Metallicity [Fe/H]

0.13

Extended Stellar Properties

Surface gravity (log g)

4.230 dex

Stellar density

0.725 g/cm³

Systemic radial velocity

-19.96 km/s

Metallicity ratio

[Fe/H]

Distance

325.40 parsec

Light-years 1,061.31 ly

V-band magnitude

12.09 mag

Voyager-speed travel 18,716,229 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

3.045 mas

Total Proper Motion

22.424 mas/yr

PM Right Ascension

6.97 mas/yr

PM Declination

-21.31 mas/yr

Galactic Cartesian (pc)

x = 0.963 · y = 0.220 · z = 0.154

Equatorial (J2000)

RA 12.84530° · Dec 8.86755°

Galactic ℓ, b

122.908° · -54.004°

Ecliptic λ, β

15.258° · 3.099°

HTM-20 index

815043759