Key parameters at a glance

A radius of 2.30 Earth radii
A mass of 5.91 Earth masses
Surface gravity around 1.12 g
An orbital period of 3.405 days
Distance from Earth 979.76 light-years
Earth Similarity Index 0.734
Travel time at Voyager 1 speed 17,278,117 years

K2-202 b Planet Profile

Physical Specs

Radius

2.30 R⊕

Radius (Jupiter)

0.205 R♃

Mass

5.91 M⊕

Mass (Jupiter)

0.019 M♃

Density

2.66 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.734

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

#1497of 1978

top 75.6%

This planet

2.30R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-178 e 2.30 R⊕ Kepler-328 b 2.30 R⊕ GJ 536 c 2.30 R⊕

Metric	Earth	K2-202 b	Jupiter
Radius (R⊕)	1.00	2.30	11.21
Mass (M⊕)	1.00	5.91	317.83
Density (g/cm³)	5.51	2.66	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 441907126

Gaia DR2

Gaia DR2 4078733014274957184

Gaia DR3

Gaia DR3 4078733014274957184

System

K2-202

Percentile among Sub-Neptune cohort

Radius 2.302 R⊕ · percentile 24 / cohort 1978

Mass 5.910 M⊕ · percentile 24 / cohort 1978

Orbital period 3.41 d · percentile 6 / cohort 1946

Distance 300.40 pc · percentile 35 / cohort 1975

ESI 0.734 · percentile 95 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.405 days

Semi-major axis

— AU

Eccentricity

—

Inclination

87.67 °

Year Length

A year here lasts approximately 3.41 Earth days (0.9% of a terrestrial year).

Transit Fingerprint

Depth

0.058 %

Duration

2.033 h

Rp / R★

0.023171

Transit midpoint (BJD)

2,457,304.2515

Photometric dip

Transit produces a flux drop of 579 ppm lasting ≈ 2.03 h.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.734

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: K2-202

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,491 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.911 R☉

Stellar Mass

0.971 M☉

Metallicity [Fe/H]

0.27

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

1.750 g/cm³

Systemic radial velocity

28.10 km/s

Metallicity ratio

[Fe/H]

Distance

300.40 parsec

Light-years 979.76 ly

V-band magnitude

13.35 mag

Voyager-speed travel 17,278,117 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

3.300 mas

Total Proper Motion

11.802 mas/yr

PM Right Ascension

11.13 mas/yr

PM Declination

-3.93 mas/yr

Galactic Cartesian (pc)

x = 0.212 · y = -0.900 · z = -0.381

Equatorial (J2000)

RA 283.26432° · Dec -22.40706°

Galactic ℓ, b

12.943° · -10.348°

Ecliptic λ, β

282.243° · 0.470°

HTM-20 index

145925082