Key parameters at a glance

A radius of 2.68 Earth radii
A mass of 7.65 Earth masses
Surface gravity around 1.07 g
An orbital period of 53.599 days
Semi-major axis 0.2863 AU
Equilibrium temperature 529 K (256 °C)
Distance from Earth 3,776.36 light-years
Earth Similarity Index 0.459
Travel time at Voyager 1 speed 66,596,187 years

Kepler-1184 b Planet Profile

Physical Specs

Radius

2.68 R⊕

Radius (Jupiter)

0.239 R♃

Mass

7.65 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.18 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.459

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#896of 1978

top 45.2%

This planet

2.68R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-487 c 2.68 R⊕ K2-58 b 2.68 R⊕ Kepler-899 b 2.68 R⊕

Metric	Earth	Kepler-1184 b	Jupiter
Radius (R⊕)	1.00	2.68	11.21
Mass (M⊕)	1.00	7.65	317.83
Density (g/cm³)	5.51	2.18	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	18.04	0.037

Star Catalogue Identifiers

TIC

TIC 159725400

Gaia DR2

Gaia DR2 2129099474286578048

Gaia DR3

Gaia DR3 2129099474286578048

System

Kepler-1184

Percentile among Sub-Neptune cohort

Radius 2.680 R⊕ · percentile 54 / cohort 1978

Mass 7.650 M⊕ · percentile 50 / cohort 1978

Orbital period 53.60 d · percentile 87 / cohort 1946

Distance 1,157.84 pc · percentile 85 / cohort 1975

ESI 0.459 · percentile 64 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

53.599 days

Semi-major axis

0.2863 AU

Eccentricity

0.000

Inclination

89.20 °

Year Length

A year here lasts approximately 53.60 Earth days (14.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2863 AU.

Transit Fingerprint

Depth

0.052 %

Duration

6.662 h

Impact parameter b

0.597

Rp / R★

0.022821

Transit midpoint (BJD)

2,454,980.4289

Photometric dip

Transit produces a flux drop of 523 ppm lasting ≈ 6.66 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022821

Semi-major axis / stellar radius

47.000

Impact parameter (b)

0.597

Transit mid-time (BJD)

2,454,980.4289

Angular separation (arcsec)

0.24700

Eq. Temperature

529K

(256 °C)

Insolation (S⊕)

18.04

Earth = 1.00

Earth Similarity (ESI)

0.459

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — 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

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1184

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,983 K — hotter than the Sun (5,778 K)

Estimated Age

3.55 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.070 R☉

Stellar Mass

1.050 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.410 dex

Stellar density

0.686 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,157.84 parsec

Light-years 3,776.36 ly

V-band magnitude

14.99 mag

Voyager-speed travel 66,596,187 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.835 mas

Total Proper Motion

9.598 mas/yr

PM Right Ascension

-4.11 mas/yr

PM Declination

-8.67 mas/yr

Galactic Cartesian (pc)

x = 0.248 · y = -0.636 · z = 0.731

Equatorial (J2000)

RA 291.28203° · Dec 46.96595°

Galactic ℓ, b

78.811° · 14.143°

Ecliptic λ, β

310.239° · 67.455°

HTM-20 index

-178662181