Key parameters at a glance

A radius of 2.12 Earth radii
A mass of 5.16 Earth masses
Surface gravity around 1.14 g
An orbital period of 8.270 days
Distance from Earth 1,317.55 light-years
Earth Similarity Index 0.763
Travel time at Voyager 1 speed 23,235,043 years

K2-215 b Planet Profile

Physical Specs

Radius

2.12 R⊕

Radius (Jupiter)

0.189 R♃

Mass

5.16 M⊕

Mass (Jupiter)

0.016 M♃

Density

2.96 g/cm³

Surface Gravity

1.14 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.763

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

#1780of 1978

top 89.9%

This planet

2.12R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-2120 b 2.12 R⊕ TOI-1468 c 2.13 R⊕ Kepler-161 b 2.12 R⊕

Metric	Earth	K2-215 b	Jupiter
Radius (R⊕)	1.00	2.12	11.21
Mass (M⊕)	1.00	5.16	317.83
Density (g/cm³)	5.51	2.96	1.33
Surface Gravity (g)	1.00	1.14	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 376905329

Gaia DR2

Gaia DR2 2564621115285038208

Gaia DR3

Gaia DR3 2564621115285038208

System

K2-215

Percentile among Sub-Neptune cohort

Radius 2.124 R⊕ · percentile 10 / cohort 1978

Mass 5.160 M⊕ · percentile 11 / cohort 1978

Orbital period 8.27 d · percentile 27 / cohort 1946

Distance 403.96 pc · percentile 41 / cohort 1975

ESI 0.763 · percentile 98 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.270 days

Semi-major axis

— AU

Eccentricity

—

Inclination

88.98 °

Year Length

A year here lasts approximately 8.27 Earth days (2.3% of a terrestrial year).

Transit Fingerprint

Depth

0.054 %

Duration

2.232 h

Rp / R★

0.019982

Transit midpoint (BJD)

2,457,394.3323

Photometric dip

Transit produces a flux drop of 543 ppm lasting ≈ 2.23 h.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.763

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: K2-215

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,704 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.974 R☉

Stellar Mass

1.000 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.410 dex

Stellar density

1.341 g/cm³

Metallicity ratio

[Fe/H]

Distance

403.96 parsec

Light-years 1,317.55 ly

V-band magnitude

12.99 mag

Voyager-speed travel 23,235,043 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

2.447 mas

Total Proper Motion

12.575 mas/yr

PM Right Ascension

-6.45 mas/yr

PM Declination

-10.80 mas/yr

Galactic Cartesian (pc)

x = 0.943 · y = 0.315 · z = 0.107

Equatorial (J2000)

RA 18.47008° · Dec 6.12386°

Galactic ℓ, b

133.024° · -56.307°

Ecliptic λ, β

19.360° · -1.572°

HTM-20 index

2021966818