Key parameters at a glance

A radius of 2.55 Earth radii
A mass of 7.04 Earth masses
Surface gravity around 1.08 g
An orbital period of 25.934 days
Semi-major axis 0.1800 AU
Equilibrium temperature 695 K (422 °C)
Distance from Earth 2,778.43 light-years
Earth Similarity Index 0.362
Travel time at Voyager 1 speed 48,997,524 years

1 sibling around Kepler-268

Kepler-268 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-268 b this	Sub-Neptune	2.55	7.04	25.934	695	2014
Kepler-268 c	Sub-Neptune	3.38	11.40	83.446	471	2014

Kepler-268 b Planet Profile

Physical Specs

Radius

2.55 R⊕

Radius (Jupiter)

0.227 R♃

Mass

7.04 M⊕

Mass (Jupiter)

0.022 M♃

Density

2.33 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.362

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

#1105of 1978

top 55.8%

This planet

2.55R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-156 c 2.55 R⊕ Kepler-1535 b 2.55 R⊕ Kepler-1043 b 2.55 R⊕

Metric	Earth	Kepler-268 b	Jupiter
Radius (R⊕)	1.00	2.55	11.21
Mass (M⊕)	1.00	7.04	317.83
Density (g/cm³)	5.51	2.33	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	64.93	0.037

Star Catalogue Identifiers

TIC

TIC 137348987

Gaia DR2

Gaia DR2 2051908157384215296

Gaia DR3

Gaia DR3 2051908157384215296

System

Kepler-268

Percentile among Sub-Neptune cohort

Radius 2.550 R⊕ · percentile 44 / cohort 1978

Mass 7.040 M⊕ · percentile 41 / cohort 1978

Orbital period 25.93 d · percentile 70 / cohort 1946

Distance 851.87 pc · percentile 69 / cohort 1975

ESI 0.362 · percentile 43 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

25.934 days

Semi-major axis

0.1800 AU

Eccentricity

0.000

Inclination

89.98 °

Year Length

A year here lasts approximately 25.93 Earth days (7.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1800 AU.

Transit Fingerprint

Depth

0.041 %

Duration

4.571 h

Impact parameter b

0.070

Rp / R★

0.019017

Transit midpoint (BJD)

2,454,982.7621

Photometric dip

Transit produces a flux drop of 415 ppm lasting ≈ 4.57 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019017

Semi-major axis / stellar radius

14.500

Impact parameter (b)

0.070

Transit mid-time (BJD)

2,454,982.7621

Angular separation (arcsec)

0.21100

Eq. Temperature

695K

(422 °C)

Insolation (S⊕)

64.93

Earth = 1.00

Earth Similarity (ESI)

0.362

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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-268

Spectral Class

F-type yellow-white

Effective Temperature

6,081 K — hotter than the Sun (5,778 K)

Estimated Age

1.71 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.274 R☉

Stellar Mass

1.109 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.287 dex

Stellar density

0.590 g/cm³

Metallicity ratio

[M/H]

Distance

851.87 parsec

Light-years 2,778.43 ly

V-band magnitude

13.84 mag

Voyager-speed travel 48,997,524 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

1.145 mas

Total Proper Motion

7.778 mas/yr

PM Right Ascension

-5.00 mas/yr

PM Declination

-5.95 mas/yr

Galactic Cartesian (pc)

x = 0.295 · y = -0.730 · z = 0.616

Equatorial (J2000)

RA 291.97616° · Dec 38.05503°

Galactic ℓ, b

70.843° · 9.790°

Ecliptic λ, β

304.747° · 58.872°

HTM-20 index

1972392676