Key parameters at a glance

A radius of 9.10 Earth radii
A mass of 61.00 Earth masses
Surface gravity around 0.74 g
An orbital period of 13.157 days
Semi-major axis 0.1070 AU
Equilibrium temperature 753 K (480 °C)
Distance from Earth 894.65 light-years
Earth Similarity Index 0.189
Travel time at Voyager 1 speed 15,777,080 years

K2-289 b Planet Profile

Physical Specs

Radius

9.10 R⊕

Radius (Jupiter)

0.812 R♃

Mass

61.00 M⊕

Mass (Jupiter)

0.192 M♃

Density

0.45 g/cm³

Surface Gravity

0.74 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.189

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#80of 574

top 13.8%

This planet

9.10R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-1268 b 9.10 R⊕ TOI-5422 b 9.10 R⊕ K2-139 b 9.11 R⊕

Metric	Earth	K2-289 b	Jupiter
Radius (R⊕)	1.00	9.10	11.21
Mass (M⊕)	1.00	61.00	317.83
Density (g/cm³)	5.51	0.45	1.33
Surface Gravity (g)	1.00	0.74	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 413753029

Gaia DR2

Gaia DR2 4325505960880989952

Gaia DR3

Gaia DR3 4325505960880989952

System

K2-289

Percentile among Neptune-like cohort

Radius 9.100 R⊕ · percentile 86 / cohort 574

Mass 61.000 M⊕ · percentile 79 / cohort 574

Orbital period 13.16 d · percentile 43 / cohort 524

Distance 274.30 pc · percentile 46 / cohort 572

ESI 0.189 · percentile 25 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

13.157 days

Semi-major axis

0.1070 AU

Eccentricity

—

Inclination

88.48 °

Year Length

A year here lasts approximately 13.16 Earth days (3.6% of a terrestrial year) at a mean orbital distance of 0.1070 AU.

Transit Fingerprint

Depth

0.762 %

Duration

4.032 h

Impact parameter b

0.600

Rp / R★

0.081000

Transit midpoint (BJD)

2,456,897.1433

Photometric dip

Transit produces a flux drop of 7,619 ppm lasting ≈ 4.03 h.

Extended Orbital Architecture

Planet / star radius ratio

0.081000

Semi-major axis / stellar radius

22.500

Impact parameter (b)

0.600

Transit mid-time (BJD)

2,456,897.1433

Angular separation (arcsec)

0.39000

Eq. Temperature

753K

(480 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.189

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Livingston et al. 2019

Instrument

Kepler CCD Array

Publication

2019-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2019 at K2 (12 shown).

EPIC 206032309 b · Rocky Terrestrial EPIC 201833600 c · Rocky Terrestrial EPIC 206215704 b · Rocky Terrestrial EPIC 201754305 d · Rocky Terrestrial EPIC 201841433 b · Rocky Terrestrial EPIC 206317286 b · Rocky Terrestrial EPIC 201615463 c · Rocky Terrestrial EPIC 212499991 b · Super-Earth EPIC 220554210 c · Super-Earth EPIC 201497682 b · Rocky Terrestrial K2-133 e · Super-Earth EPIC 206024342 b · Super-Earth

Host System: K2-289

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,529 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.025 R☉

Stellar Mass

0.953 M☉

Metallicity [Fe/H]

0.16

Extended Stellar Properties

Surface gravity (log g)

4.393 dex

Stellar density

1.240 g/cm³

Metallicity ratio

[Fe/H]

Distance

274.30 parsec

Light-years 894.65 ly

V-band magnitude

14.81 mag

Voyager-speed travel 15,777,080 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

3.617 mas

Total Proper Motion

42.903 mas/yr

PM Right Ascension

-21.71 mas/yr

PM Declination

-37.01 mas/yr

Galactic Cartesian (pc)

x = -0.381 · y = -0.883 · z = -0.272

Equatorial (J2000)

RA 246.64294° · Dec -15.79254°

Galactic ℓ, b

0.072° · 22.451°

Ecliptic λ, β

247.447° · 5.837°

HTM-20 index

-249798274