Key parameters at a glance

A radius of 2.20 Earth radii
A mass of 5.48 Earth masses
Surface gravity around 1.13 g
An orbital period of 6.930 days
Semi-major axis 0.0419 AU
Equilibrium temperature 423 K (150 °C)
Distance from Earth 364.11 light-years
Earth Similarity Index 0.601
Travel time at Voyager 1 speed 6,421,151 years
Almost certainly tidally locked to its host star given the close orbit

K2-325 b Planet Profile

Physical Specs

Radius

2.20 R⊕

Radius (Jupiter)

0.196 R♃

Mass

5.48 M⊕

Mass (Jupiter)

0.017 M♃

Density

2.83 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.601

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

#1673of 1978

top 84.5%

This planet

2.20R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 110067 b 2.20 R⊕ Kepler-169 e 2.20 R⊕ Kepler-122 d 2.20 R⊕

Metric	Earth	K2-325 b	Jupiter
Radius (R⊕)	1.00	2.20	11.21
Mass (M⊕)	1.00	5.48	317.83
Density (g/cm³)	5.51	2.83	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 8918021

Gaia DR2

Gaia DR2 2439222638771000448

Gaia DR3

Gaia DR3 2439222638771000448

System

K2-325

Percentile among Sub-Neptune cohort

Radius 2.200 R⊕ · percentile 15 / cohort 1978

Mass 5.480 M⊕ · percentile 15 / cohort 1978

Orbital period 6.93 d · percentile 22 / cohort 1946

Distance 111.64 pc · percentile 22 / cohort 1975

ESI 0.601 · percentile 82 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

6.930 days

Semi-major axis

0.0419 AU

Eccentricity

—

Inclination

89.37 °

Year Length

A year here lasts approximately 6.93 Earth days (1.9% of a terrestrial year) at a mean orbital distance of 0.0419 AU.

Transit Fingerprint

Depth

0.672 %

Impact parameter b

0.340

Transit midpoint (BJD)

2,457,743.8180

Photometric dip

Transit produces a flux drop of 6,720 ppm.

Eq. Temperature

423K

(150 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.601

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 K2-317 b · Sub-Neptune K2-322 b · Super-Earth K2-319 b · Sub-Neptune K2-316 b · Super-Earth K2-324 b · Sub-Neptune K2-320 b · Sub-Neptune

Host System: K2-325

Spectral Class

M-type red dwarf

Effective Temperature

3,287 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.298 R☉

Stellar Mass

0.274 M☉

Metallicity [Fe/H]

—

Distance

111.64 parsec

Light-years 364.11 ly

V-band magnitude

17.77 mag

Voyager-speed travel 6,421,151 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

8.930 mas

Total Proper Motion

42.223 mas/yr

PM Right Ascension

-1.87 mas/yr

PM Declination

-42.18 mas/yr

Galactic Cartesian (pc)

x = 0.985 · y = -0.105 · z = -0.134

Equatorial (J2000)

RA 353.91695° · Dec -7.68672°

Galactic ℓ, b

76.720° · -63.536°

Ecliptic λ, β

351.366° · -4.643°

HTM-20 index

783202912