Key parameters at a glance

A radius of 1.86 Earth radii
A mass of 4.12 Earth masses
Surface gravity around 1.19 g
An orbital period of 15.852 days
Equilibrium temperature 766 K (493 °C)
Distance from Earth 795.61 light-years
Earth Similarity Index 0.368
Travel time at Voyager 1 speed 14,030,558 years

1 sibling around K2-168

K2-168 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
EPIC 205950854 c	Super-Earth	1.31	2.27	8.051	961	2019
K2-168 b this	Super-Earth	1.86	4.12	15.852	766	2018

K2-168 b Planet Profile

Physical Specs

Radius

1.86 R⊕

Radius (Jupiter)

0.166 R♃

Mass

4.12 M⊕

Mass (Jupiter)

0.013 M♃

Density

3.52 g/cm³

Surface Gravity

1.19 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.368

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

#177of 1176

top 15.0%

This planet

1.86R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-299 d 1.86 R⊕ Kepler-191 c 1.86 R⊕ Kepler-265 b 1.86 R⊕

Metric	Earth	K2-168 b	Jupiter
Radius (R⊕)	1.00	1.86	11.21
Mass (M⊕)	1.00	4.12	317.83
Density (g/cm³)	5.51	3.52	1.33
Surface Gravity (g)	1.00	1.19	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 437695245

Gaia DR2

Gaia DR2 6826271727199243264

Gaia DR3

Gaia DR3 6826271727199243264

System

K2-168

Percentile among Super-Earth cohort

Radius 1.860 R⊕ · percentile 84 / cohort 1176

Mass 4.120 M⊕ · percentile 77 / cohort 1176

Orbital period 15.85 d · percentile 79 / cohort 1164

Distance 243.94 pc · percentile 27 / cohort 1171

ESI 0.368 · percentile 55 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

15.852 days

Semi-major axis

— AU

Eccentricity

—

Inclination

89.40 °

Year Length

A year here lasts approximately 15.85 Earth days (4.3% of a terrestrial year).

Transit Fingerprint

Depth

0.053 %

Duration

3.792 h

Impact parameter b

0.320

Rp / R★

0.018120

Transit midpoint (BJD)

2,456,975.0377

Photometric dip

Transit produces a flux drop of 532 ppm lasting ≈ 3.79 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018120

Semi-major axis / stellar radius

25.420

Impact parameter (b)

0.320

Transit mid-time (BJD)

2,456,975.0377

Eq. Temperature

766K

(493 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.368

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

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: K2-168

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,503 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.830 R☉

Stellar Mass

0.877 M☉

Metallicity [Fe/H]

-0.13

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

1.270 g/cm³

Systemic radial velocity

-10.09 km/s

Metallicity ratio

[Fe/H]

Distance

243.94 parsec

Light-years 795.61 ly

V-band magnitude

12.37 mag

Voyager-speed travel 14,030,558 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

4.072 mas

Total Proper Motion

47.271 mas/yr

PM Right Ascension

36.80 mas/yr

PM Declination

-29.67 mas/yr

Galactic Cartesian (pc)

x = 0.856 · y = -0.434 · z = -0.281

Equatorial (J2000)

RA 333.11007° · Dec -16.34189°

Galactic ℓ, b

40.911° · -51.713°

Ecliptic λ, β

329.200° · -4.906°

HTM-20 index

-1533279856