Key parameters at a glance

A radius of 2.67 Earth radii
A mass of 7.60 Earth masses
Surface gravity around 1.07 g
An orbital period of 19.660 days
Semi-major axis 0.1128 AU
Equilibrium temperature 331 K (58 °C)
Distance from Earth 605.36 light-years
Earth Similarity Index 0.678
Travel time at Voyager 1 speed 10,675,556 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around K2-264

K2-264 c 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
K2-264 b	Sub-Neptune	2.23	5.61	5.840	496	2018
K2-264 c this	Sub-Neptune	2.67	7.60	19.660	331	2018

K2-264 c Planet Profile

Physical Specs

Radius

2.67 R⊕

Radius (Jupiter)

0.238 R♃

Mass

7.60 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.20 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.678

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

#924of 1978

top 46.7%

This planet

2.67R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-3353.01 2.67 R⊕ Kepler-96 b 2.67 R⊕ K2-26 b 2.67 R⊕

Metric	Earth	K2-264 c	Jupiter
Radius (R⊕)	1.00	2.67	11.21
Mass (M⊕)	1.00	7.60	317.83
Density (g/cm³)	5.51	2.20	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 184914317

Gaia DR2

Gaia DR2 661167785238757376

Gaia DR3

Gaia DR3 661167785238757376

System

K2-264

Percentile among Sub-Neptune cohort

Radius 2.668 R⊕ · percentile 53 / cohort 1978

Mass 7.600 M⊕ · percentile 49 / cohort 1978

Orbital period 19.66 d · percentile 62 / cohort 1946

Distance 185.61 pc · percentile 28 / cohort 1975

ESI 0.678 · percentile 90 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.660 days

Semi-major axis

0.1128 AU

Eccentricity

0.450

Inclination

89.38 °

Year Length

A year here lasts approximately 19.66 Earth days (5.4% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1128 AU.

Transit Fingerprint

Duration

2.618 h

Impact parameter b

0.550

Rp / R★

0.051640

Transit midpoint (BJD)

2,458,117.0917

Extended Orbital Architecture

Planet / star radius ratio

0.051640

Semi-major axis / stellar radius

51.300

Impact parameter (b)

0.550

Transit mid-time (BJD)

2,458,117.0917

Angular separation (arcsec)

0.60800

Eq. Temperature

331K

(58 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.678

0 = alien, 1 = Earth-identical

Insufficient insolation data — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Rizzuto et al. 2018

Instrument

Kepler CCD Array

Publication

2018-11

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: K2-264

Spectral Class

M-type red dwarf

Effective Temperature

3,660 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.473 R☉

Stellar Mass

0.496 M☉

Metallicity [Fe/H]

-0.01

Extended Stellar Properties

Surface gravity (log g)

4.783 dex

Stellar density

6.610 g/cm³

Systemic radial velocity

26.00 km/s

Rotation period

22.20 days

Metallicity ratio

[Fe/H]

Distance

185.61 parsec

Light-years 605.36 ly

V-band magnitude

16.70 mag

Voyager-speed travel 10,675,556 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

5.360 mas

Total Proper Motion

40.093 mas/yr

PM Right Ascension

-37.90 mas/yr

PM Declination

-13.08 mas/yr

Galactic Cartesian (pc)

x = -0.622 · y = 0.707 · z = 0.337

Equatorial (J2000)

RA 131.35835° · Dec 19.69840°

Galactic ℓ, b

206.372° · 33.607°

Ecliptic λ, β

128.484° · 1.614°

HTM-20 index

1230300773