Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 267.00 Earth masses
Surface gravity around 1.38 g
An orbital period of 632.620 days
Semi-major axis 1.4690 AU
Distance from Earth 470.21 light-years
Earth Similarity Index 0.294
Travel time at Voyager 1 speed 8,292,083 years

3 siblings around Kepler-68

Kepler-68 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-68 b	Sub-Neptune	2.36	8.03	5.399	1,275	2013
Kepler-68 c	Rocky Terrestrial	0.98	1.30	9.605	1,052	2013
Kepler-68 d this	Gas Giant	13.90	267.00	632.620	—	2013
Kepler-68 e	Gas Giant	11.20	86.45	3,455.000	—	2023

Kepler-68 d Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

267.00 M⊕

Mass (Jupiter)

0.840 M♃

Density

0.55 g/cm³

Surface Gravity

1.38 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.294

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#456of 1771

top 25.7%

This planet

13.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

24 Sex c 13.90 R⊕ HD 148156 b 13.90 R⊕ HD 134987 c 13.90 R⊕

Metric	Earth	Kepler-68 d	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	267.00	317.83
Density (g/cm³)	5.51	0.55	1.33
Surface Gravity (g)	1.00	1.38	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	267.000 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	238.053 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 417676622

Gaia DR2

Gaia DR2 2129550445852902656

Gaia DR3

Gaia DR3 2129550445852902656

System

Kepler-68

Percentile among Gas Giant cohort

Radius 13.900 R⊕ · percentile 72 / cohort 1771

Mass 267.000 M⊕ · percentile 29 / cohort 1747

Orbital period 632.62 d · percentile 71 / cohort 1533

Distance 144.17 pc · percentile 43 / cohort 1759

ESI 0.294 · percentile 56 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

632.620 days

Semi-major axis

1.4690 AU

Eccentricity

0.102

Inclination

— °

Year Length

A year here lasts about 1.73 Earth years on a mildly elliptical path at a mean orbital distance of 1.4690 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

17.200 m/s

Transit mid-time (BJD)

2,455,892.0000

Long. of periastron (ω)

256.40°

Angular separation (arcsec)

10.20000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.294

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Gilliland et al. 2013

Instrument

HIRES Spectrometer

Publication

2013-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2013 at W. M. Keck Observatory (2 shown).

ROXs 12 b · Gas Giant 2MASS J01225093-2439505 b · Gas Giant

Host System: Kepler-68

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,847 K — hotter than the Sun (5,778 K)

Estimated Age

6.84 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.256 R☉

Stellar Mass

1.057 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.281 dex

Stellar density

0.790 g/cm³

Systemic radial velocity

-20.90 km/s

Rotational v·sin i

0.50 km/s

Metallicity ratio

[Fe/H]

Distance

144.17 parsec

Light-years 470.21 ly

V-band magnitude

10.08 mag

Voyager-speed travel 8,292,083 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

6.908 mas

Total Proper Motion

12.750 mas/yr

PM Right Ascension

-7.33 mas/yr

PM Declination

-10.43 mas/yr

Galactic Cartesian (pc)

x = 0.235 · y = -0.612 · z = 0.755

Equatorial (J2000)

RA 291.03231° · Dec 49.04021°

Galactic ℓ, b

80.691° · 15.154°

Ecliptic λ, β

312.030° · 69.429°

HTM-20 index

861394382