Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 667.44 Earth masses
Surface gravity around 3.72 g
An orbital period of 3.295 days
Distance from Earth 2,306.91 light-years
Earth Similarity Index 0.368
Travel time at Voyager 1 speed 40,682,376 years

KIC 8121913 b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.190 R♃

Mass

667.44 M⊕

Mass (Jupiter)

2.100 M♃

Density

1.52 g/cm³

Surface Gravity

3.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.368

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Orbital Brightness Modulation

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕

Metric	Earth	KIC 8121913 b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	667.44	317.83
Density (g/cm³)	5.51	1.52	1.33
Surface Gravity (g)	1.00	3.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	667.440 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 268484648

Gaia DR2

Gaia DR2 2078991014258266624

Gaia DR3

Gaia DR3 2078991014258266624

System

KIC 8121913

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 667.440 M⊕ · percentile 56 / cohort 1747

Orbital period 3.29 d · percentile 20 / cohort 1533

Distance 707.30 pc · percentile 81 / cohort 1759

ESI 0.368 · percentile 76 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3.295 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 3.29 Earth days (0.9% of a terrestrial year).

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.368

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Orbital-brightness modulation

Host star brightness varies with the planet's orbit.

Discovery Paper

Primary reference

Lillo Box et al. 2021

Instrument

Kepler CCD Array

Publication

2021-10

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: KIC 8121913

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,975 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

2.233 R☉

Stellar Mass

1.456 M☉

Metallicity [Fe/H]

0.25

Extended Stellar Properties

Surface gravity (log g)

3.896 dex

Stellar density

0.122 g/cm³

Metallicity ratio

[Fe/H]

Distance

707.30 parsec

Light-years 2,306.91 ly

V-band magnitude

12.38 mag

Voyager-speed travel 40,682,376 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Parallax

1.385 mas

Total Proper Motion

7.371 mas/yr

PM Right Ascension

-6.03 mas/yr

PM Declination

-4.24 mas/yr

Galactic Cartesian (pc)

x = 0.349 · y = -0.630 · z = 0.694

Equatorial (J2000)

RA 298.96780° · Dec 43.90938°

Galactic ℓ, b

78.595° · 7.952°

Ecliptic λ, β

319.079° · 62.500°

HTM-20 index

1704468814