Key parameters at a glance

A radius of 3.38 Earth radii
A mass of 11.40 Earth masses
Surface gravity around 1.00 g
An orbital period of 83.446 days
Semi-major axis 0.3910 AU
Equilibrium temperature 471 K (198 °C)
Distance from Earth 2,778.43 light-years
Earth Similarity Index 0.464
Travel time at Voyager 1 speed 48,997,524 years

1 sibling around Kepler-268

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

Kepler-268 c Planet Profile

Physical Specs

Radius

3.38 R⊕

Radius (Jupiter)

0.302 R♃

Mass

11.40 M⊕

Mass (Jupiter)

0.036 M♃

Density

1.62 g/cm³

Surface Gravity

1.00 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.464

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

#230of 1978

top 11.6%

This planet

3.38R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-965 b 3.38 R⊕ Kepler-139 c 3.38 R⊕ Kepler-533 b 3.38 R⊕

Metric	Earth	Kepler-268 c	Jupiter
Radius (R⊕)	1.00	3.38	11.21
Mass (M⊕)	1.00	11.40	317.83
Density (g/cm³)	5.51	1.62	1.33
Surface Gravity (g)	1.00	1.00	2.53
Insolation (S⊕)	1.00	13.66	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 3.380 R⊕ · percentile 88 / cohort 1978

Mass 11.400 M⊕ · percentile 82 / cohort 1978

Orbital period 83.45 d · percentile 92 / cohort 1946

Distance 851.87 pc · percentile 69 / cohort 1975

ESI 0.464 · percentile 65 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

83.446 days

Semi-major axis

0.3910 AU

Eccentricity

0.000

Inclination

89.97 °

Year Length

A year here lasts approximately 83.45 Earth days (22.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3910 AU.

Transit Fingerprint

Depth

0.050 %

Duration

7.219 h

Impact parameter b

0.910

Rp / R★

0.020437

Transit midpoint (BJD)

2,454,991.6851

Photometric dip

Transit produces a flux drop of 503 ppm lasting ≈ 7.22 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020437

Semi-major axis / stellar radius

99.761

Impact parameter (b)

0.910

Transit mid-time (BJD)

2,454,991.6851

Angular separation (arcsec)

0.45900

Eq. Temperature

471K

(198 °C)

Insolation (S⊕)

13.66

Earth = 1.00

Earth Similarity (ESI)

0.464

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