Key parameters at a glance

A radius of 2.36 Earth radii
A mass of 2.03 Earth masses
Surface gravity around 0.36 g
An orbital period of 20.090 days
Semi-major axis 0.1180 AU
Equilibrium temperature 362 K (89 °C)
Distance from Earth 1,305.96 light-years
Earth Similarity Index 0.451
Travel time at Voyager 1 speed 23,030,568 years
Almost certainly tidally locked to its host star given the close orbit

2 siblings around Kepler-83

Kepler-83 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-83 d	Super-Earth	1.94	4.10	5.170	569	2014
Kepler-83 b	Sub-Neptune	2.83	2.94	9.770	460	2012
Kepler-83 c this	Sub-Neptune	2.36	2.03	20.090	362	2012

Kepler-83 c Planet Profile

Physical Specs

Radius

2.36 R⊕

Radius (Jupiter)

0.211 R♃

Mass

2.03 M⊕

Mass (Jupiter)

0.006 M♃

Density

0.38 g/cm³

Surface Gravity

0.36 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.451

HZ Position Inner

Controversial No

Discovery

Year 2012

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1395of 1978

top 70.5%

This planet

2.36R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1022 b 2.36 R⊕ Kepler-482 b 2.36 R⊕ Kepler-184 b 2.36 R⊕

Metric	Earth	Kepler-83 c	Jupiter
Radius (R⊕)	1.00	2.36	11.21
Mass (M⊕)	1.00	2.03	317.83
Density (g/cm³)	5.51	0.38	1.33
Surface Gravity (g)	1.00	0.36	2.53
Insolation (S⊕)	1.00	5.90	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2.030 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 123416515

Gaia DR2

Gaia DR2 2105261134483173632

Gaia DR3

Gaia DR3 2105261134483173632

System

Kepler-83

Percentile among Sub-Neptune cohort

Radius 2.360 R⊕ · percentile 29 / cohort 1978

Mass 2.030 M⊕ · percentile 0 / cohort 1978

Orbital period 20.09 d · percentile 62 / cohort 1946

Distance 400.41 pc · percentile 41 / cohort 1975

ESI 0.451 · percentile 62 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

20.090 days

Semi-major axis

0.1180 AU

Eccentricity

0.000

Inclination

87.49 °

Year Length

A year here lasts approximately 20.09 Earth days (5.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1180 AU.

Transit Fingerprint

Depth

0.143 %

Duration

3.588 h

Impact parameter b

0.217

Rp / R★

0.036232

Transit midpoint (BJD)

2,454,980.9711

Photometric dip

Transit produces a flux drop of 1,432 ppm lasting ≈ 3.59 h.

Extended Orbital Architecture

Planet / star radius ratio

0.036232

Semi-major axis / stellar radius

43.340

Impact parameter (b)

0.217

Transit mid-time (BJD)

2,454,980.9711

Angular separation (arcsec)

0.29500

Eq. Temperature

362K

(89 °C)

Insolation (S⊕)

5.90

Earth = 1.00

Earth Similarity (ESI)

0.451

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Xie 2013

Instrument

Kepler CCD Array

Publication

2013-10

Observation locale

Space

Discovery cohort

Planets confirmed in 2012 at Kepler (12 shown).

Kepler-54 c · Rocky Terrestrial Kepler-49 c · Sub-Neptune Kepler-55 b · Sub-Neptune Kepler-49 b · Sub-Neptune Kepler-81 c · Sub-Neptune Kepler-55 c · Sub-Neptune Kepler-52 c · Super-Earth Kepler-32 d · Sub-Neptune Kepler-83 b · Sub-Neptune Kepler-54 b · Sub-Neptune Kepler-80 c · Sub-Neptune Kepler-81 b · Sub-Neptune

Host System: Kepler-83

Spectral Class

M-type red dwarf

Effective Temperature

4,082 K — cooler than the Sun (5,778 K)

Estimated Age

3.09 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.610 R☉

Stellar Mass

0.660 M☉

Metallicity [Fe/H]

-0.20

Extended Stellar Properties

Surface gravity (log g)

4.690 dex

Stellar density

3.816 g/cm³

Metallicity ratio

[Fe/H]

Distance

400.41 parsec

Light-years 1,305.96 ly

V-band magnitude

16.15 mag

Voyager-speed travel 23,030,568 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.469 mas

Total Proper Motion

13.774 mas/yr

PM Right Ascension

1.91 mas/yr

PM Declination

-13.64 mas/yr

Galactic Cartesian (pc)

x = 0.153 · y = -0.707 · z = 0.690

Equatorial (J2000)

RA 282.23252° · Dec 43.66557°

Galactic ℓ, b

73.114° · 18.777°

Ecliptic λ, β

292.282° · 66.161°

HTM-20 index

-713350925