Key parameters at a glance

A radius of 1.47 Earth radii
A mass of 2.76 Earth masses
Surface gravity around 1.28 g
An orbital period of 16.978 days
Semi-major axis 0.1685 AU
Equilibrium temperature 533 K (260 °C)
Distance from Earth 246.53 light-years
Earth Similarity Index 0.563
Travel time at Voyager 1 speed 4,347,509 years

K2-184 b Planet Profile

Physical Specs

Radius

1.47 R⊕

Radius (Jupiter)

0.131 R♃

Mass

2.76 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.77 g/cm³

Surface Gravity

1.28 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.563

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

#802of 1176

top 68.1%

This planet

1.47R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-292 c 1.47 R⊕ Kepler-10 b 1.47 R⊕ Kepler-137 b 1.47 R⊕

Metric	Earth	K2-184 b	Jupiter
Radius (R⊕)	1.00	1.47	11.21
Mass (M⊕)	1.00	2.76	317.83
Density (g/cm³)	5.51	4.77	1.33
Surface Gravity (g)	1.00	1.28	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 21244210

Gaia DR2

Gaia DR2 651522834880015872

Gaia DR3

Gaia DR3 651522834880015872

System

K2-184

Percentile among Super-Earth cohort

Radius 1.470 R⊕ · percentile 31 / cohort 1176

Mass 2.760 M⊕ · percentile 29 / cohort 1176

Orbital period 16.98 d · percentile 81 / cohort 1164

Distance 75.59 pc · percentile 15 / cohort 1171

ESI 0.563 · percentile 79 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

16.978 days

Semi-major axis

0.1685 AU

Eccentricity

—

Inclination

89.47 °

Year Length

A year here lasts approximately 16.98 Earth days (4.6% of a terrestrial year) at a mean orbital distance of 0.1685 AU.

Transit Fingerprint

Depth

0.037 %

Duration

2.491 h

Impact parameter b

0.420

Rp / R★

0.018000

Transit midpoint (BJD)

2,457,148.5253

Photometric dip

Transit produces a flux drop of 370 ppm lasting ≈ 2.49 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018000

Semi-major axis / stellar radius

48.360

Impact parameter (b)

0.420

Transit mid-time (BJD)

2,457,148.5253

Angular separation (arcsec)

2.23000

Eq. Temperature

533K

(260 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.563

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

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: K2-184

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,245 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.750 R☉

Stellar Mass

0.840 M☉

Metallicity [Fe/H]

-0.10

Extended Stellar Properties

Surface gravity (log g)

4.620 dex

Stellar density

2.779 g/cm³

Systemic radial velocity

-33.64 km/s

Metallicity ratio

[Fe/H]

Distance

75.59 parsec

Light-years 246.53 ly

V-band magnitude

10.35 mag

Voyager-speed travel 4,347,509 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

13.202 mas

Total Proper Motion

90.686 mas/yr

PM Right Ascension

89.83 mas/yr

PM Declination

-12.42 mas/yr

Galactic Cartesian (pc)

x = -0.611 · y = 0.751 · z = 0.250

Equatorial (J2000)

RA 129.14052° · Dec 14.46188°

Galactic ℓ, b

211.166° · 29.700°

Ecliptic λ, β

127.782° · -3.992°

HTM-20 index

-697172842