Key parameters at a glance

A radius of 2.62 Earth radii
A mass of 7.37 Earth masses
Surface gravity around 1.07 g
An orbital period of 1.995 days
Semi-major axis 0.0142 AU
Equilibrium temperature 698 K (425 °C)
Distance from Earth 354.66 light-years
Earth Similarity Index 0.357
Travel time at Voyager 1 speed 6,254,465 years
Almost certainly tidally locked to its host star given the close orbit

K2-320 b Planet Profile

Physical Specs

Radius

2.62 R⊕

Radius (Jupiter)

0.234 R♃

Mass

7.37 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.25 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.357

HZ Position Unknown

Controversial No

Discovery

Year 2020

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#989of 1978

top 49.9%

This planet

2.62R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-815 c 2.62 R⊕ Kepler-977 b 2.62 R⊕ Kepler-450 c 2.62 R⊕

Metric	Earth	K2-320 b	Jupiter
Radius (R⊕)	1.00	2.62	11.21
Mass (M⊕)	1.00	7.37	317.83
Density (g/cm³)	5.51	2.25	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 281748980

Gaia DR2

Gaia DR2 3864142669886768896

Gaia DR3

Gaia DR3 3864142669886768896

System

K2-320

Percentile among Sub-Neptune cohort

Radius 2.620 R⊕ · percentile 50 / cohort 1978

Mass 7.370 M⊕ · percentile 46 / cohort 1978

Orbital period 2.00 d · percentile 2 / cohort 1946

Distance 108.74 pc · percentile 21 / cohort 1975

ESI 0.357 · percentile 42 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

1.995 days

Semi-major axis

0.0142 AU

Eccentricity

—

Inclination

87.84 °

Year Length

A year here lasts approximately 2.00 Earth days (0.5% of a terrestrial year) at a mean orbital distance of 0.0142 AU.

Transit Fingerprint

Depth

0.557 %

Impact parameter b

0.490

Transit midpoint (BJD)

2,457,908.6020

Photometric dip

Transit produces a flux drop of 5,570 ppm.

Eq. Temperature

698K

(425 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.357

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Castro Gonz Aacute Lez et al. 2020

Instrument

Kepler CCD Array

Publication

2020-12

Observation locale

Space

Discovery cohort

Planets confirmed in 2020 at K2 (12 shown).

EPIC 201170410.02 · Rocky Terrestrial EPIC 201757695.02 · Rocky Terrestrial K2-323 b · Sub-Neptune K2-315 b · Rocky Terrestrial K2-316 c · Super-Earth K2-318 b · Super-Earth K2-325 b · Sub-Neptune K2-317 b · Sub-Neptune K2-322 b · Super-Earth K2-319 b · Sub-Neptune K2-316 b · Super-Earth K2-324 b · Sub-Neptune

Host System: K2-320

Spectral Class

M-type red dwarf

Effective Temperature

3,157 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.300 R☉

Stellar Mass

0.117 M☉

Metallicity [Fe/H]

—

Distance

108.74 parsec

Light-years 354.66 ly

V-band magnitude

17.81 mag

Voyager-speed travel 6,254,465 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

9.169 mas

Total Proper Motion

68.827 mas/yr

PM Right Ascension

-58.44 mas/yr

PM Declination

-36.36 mas/yr

Galactic Cartesian (pc)

x = -0.953 · y = 0.287 · z = 0.092

Equatorial (J2000)

RA 163.25191° · Dec 5.30648°

Galactic ℓ, b

245.352° · 54.354°

Ecliptic λ, β

162.528° · -1.678°

HTM-20 index

1327132333