Key parameters at a glance

A radius of 2.61 Earth radii
A mass of 7.30 Earth masses
Surface gravity around 1.08 g
An orbital period of 12.487 days
Distance from Earth 1,184.16 light-years
Earth Similarity Index 0.689
Travel time at Voyager 1 speed 20,882,573 years

K2-207 b Planet Profile

Physical Specs

Radius

2.61 R⊕

Radius (Jupiter)

0.232 R♃

Mass

7.30 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.27 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.689

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

#1015of 1978

top 51.3%

This planet

2.61R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-20 d 2.61 R⊕ HD 110067 g 2.61 R⊕ HD 22946 d 2.61 R⊕

Metric	Earth	K2-207 b	Jupiter
Radius (R⊕)	1.00	2.61	11.21
Mass (M⊕)	1.00	7.30	317.83
Density (g/cm³)	5.51	2.27	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 257571543

Gaia DR2

Gaia DR2 2549087623029238400

Gaia DR3

Gaia DR3 2549087623029238400

System

K2-207

Percentile among Sub-Neptune cohort

Radius 2.606 R⊕ · percentile 49 / cohort 1978

Mass 7.300 M⊕ · percentile 45 / cohort 1978

Orbital period 12.49 d · percentile 43 / cohort 1946

Distance 363.06 pc · percentile 39 / cohort 1975

ESI 0.689 · percentile 91 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

12.487 days

Semi-major axis

— AU

Eccentricity

—

Inclination

88.62 °

Year Length

A year here lasts approximately 12.49 Earth days (3.4% of a terrestrial year).

Transit Fingerprint

Depth

0.090 %

Duration

4.296 h

Rp / R★

0.025739

Transit midpoint (BJD)

2,457,403.6446

Photometric dip

Transit produces a flux drop of 904 ppm lasting ≈ 4.30 h.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.689

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: K2-207

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,522 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.928 R☉

Stellar Mass

0.942 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.410 dex

Stellar density

1.859 g/cm³

Systemic radial velocity

-4.39 km/s

Metallicity ratio

[Fe/H]

Distance

363.06 parsec

Light-years 1,184.16 ly

V-band magnitude

13.18 mag

Voyager-speed travel 20,882,573 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

2.726 mas

Total Proper Motion

45.297 mas/yr

PM Right Ascension

-12.65 mas/yr

PM Declination

-43.50 mas/yr

Galactic Cartesian (pc)

x = 0.979 · y = 0.203 · z = 0.011

Equatorial (J2000)

RA 11.69965° · Dec 0.64062°

Galactic ℓ, b

120.444° · -62.209°

Ecliptic λ, β

11.005° · -4.037°

HTM-20 index

260599384