Key parameters at a glance

A radius of 3.70 Earth radii
A mass of 13.20 Earth masses
Surface gravity around 0.96 g
An orbital period of 2.712 days
Semi-major axis 0.0400 AU
Equilibrium temperature 1,420 K (1147 °C)
Distance from Earth 5,652.61 light-years
Earth Similarity Index 0.144
Travel time at Voyager 1 speed 99,683,765 years

1 sibling around Kepler-234

Kepler-234 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-234 b this	Sub-Neptune	3.70	13.20	2.712	1,420	2014
Kepler-234 c	Sub-Neptune	3.51	12.10	7.212	1,025	2014

Kepler-234 b Planet Profile

Physical Specs

Radius

3.70 R⊕

Radius (Jupiter)

0.330 R♃

Mass

13.20 M⊕

Mass (Jupiter)

0.042 M♃

Density

1.43 g/cm³

Surface Gravity

0.96 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.144

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#90of 1978

top 4.5%

This planet

3.70R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

CoRoT-24 b 3.70 R⊕ Kepler-595 b 3.71 R⊕ Kepler-1627 b 3.69 R⊕

Metric	Earth	Kepler-234 b	Jupiter
Radius (R⊕)	1.00	3.70	11.21
Mass (M⊕)	1.00	13.20	317.83
Density (g/cm³)	5.51	1.43	1.33
Surface Gravity (g)	1.00	0.96	2.53
Insolation (S⊕)	1.00	1,007.72	0.037

Star Catalogue Identifiers

TIC

TIC 137318075

Gaia DR2

Gaia DR2 2052688467040906624

Gaia DR3

Gaia DR3 2052688467040906624

System

Kepler-234

Percentile among Sub-Neptune cohort

Radius 3.700 R⊕ · percentile 95 / cohort 1978

Mass 13.200 M⊕ · percentile 88 / cohort 1978

Orbital period 2.71 d · percentile 4 / cohort 1946

Distance 1,733.10 pc · percentile 96 / cohort 1975

ESI 0.144 · percentile 2 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

2.712 days

Semi-major axis

0.0400 AU

Eccentricity

0.000

Inclination

89.81 °

Year Length

A year here lasts approximately 2.71 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0400 AU.

Transit Fingerprint

Depth

0.084 %

Duration

3.175 h

Impact parameter b

0.850

Rp / R★

0.026533

Transit midpoint (BJD)

2,455,003.0351

Photometric dip

Transit produces a flux drop of 838 ppm lasting ≈ 3.18 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026533

Semi-major axis / stellar radius

7.088

Impact parameter (b)

0.850

Transit mid-time (BJD)

2,455,003.0351

Angular separation (arcsec)

0.02310

Eq. Temperature

1,420K

(1147 °C)

Insolation (S⊕)

1,007.72

Earth = 1.00

Earth Similarity (ESI)

0.144

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-234

Spectral Class

F-type yellow-white

Effective Temperature

6,224 K — hotter than the Sun (5,778 K)

Estimated Age

2.88 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.113 R☉

Stellar Mass

1.129 M☉

Metallicity [Fe/H]

0.22

Extended Stellar Properties

Surface gravity (log g)

4.421 dex

Stellar density

0.750 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,733.10 parsec

Light-years 5,652.61 ly

V-band magnitude

15.75 mag

Voyager-speed travel 99,683,765 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.549 mas

Total Proper Motion

3.502 mas/yr

PM Right Ascension

2.63 mas/yr

PM Declination

2.31 mas/yr

Galactic Cartesian (pc)

x = 0.289 · y = -0.727 · z = 0.622

Equatorial (J2000)

RA 291.65354° · Dec 38.49466°

Galactic ℓ, b

71.126° · 10.214°

Ecliptic λ, β

304.521° · 59.366°

HTM-20 index

2086655211