Key parameters at a glance

A radius of 2.83 Earth radii
A mass of 2.94 Earth masses
Surface gravity around 0.37 g
An orbital period of 9.770 days
Semi-major axis 0.0730 AU
Equilibrium temperature 460 K (187 °C)
Distance from Earth 1,305.96 light-years
Earth Similarity Index 0.442
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 b 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 this	Sub-Neptune	2.83	2.94	9.770	460	2012
Kepler-83 c	Sub-Neptune	2.36	2.03	20.090	362	2012

Kepler-83 b Planet Profile

Physical Specs

Radius

2.83 R⊕

Radius (Jupiter)

0.252 R♃

Mass

2.94 M⊕

Mass (Jupiter)

0.009 M♃

Density

0.83 g/cm³

Surface Gravity

0.37 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.442

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

#703of 1978

top 35.5%

This planet

2.83R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 3167 e 2.83 R⊕ GJ 3634 b 2.83 R⊕ Kepler-1099 b 2.83 R⊕

Metric	Earth	Kepler-83 b	Jupiter
Radius (R⊕)	1.00	2.83	11.21
Mass (M⊕)	1.00	2.94	317.83
Density (g/cm³)	5.51	0.83	1.33
Surface Gravity (g)	1.00	0.37	2.53
Insolation (S⊕)	1.00	15.41	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2.940 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 2.830 R⊕ · percentile 64 / cohort 1978

Mass 2.940 M⊕ · percentile 1 / cohort 1978

Orbital period 9.77 d · percentile 33 / cohort 1946

Distance 400.41 pc · percentile 41 / cohort 1975

ESI 0.442 · percentile 61 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.770 days

Semi-major axis

0.0730 AU

Eccentricity

0.000

Inclination

89.84 °

Year Length

A year here lasts approximately 9.77 Earth days (2.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0730 AU.

Transit Fingerprint

Depth

0.190 %

Duration

2.476 h

Impact parameter b

0.090

Rp / R★

0.040130

Transit midpoint (BJD)

2,455,008.7135

Photometric dip

Transit produces a flux drop of 1,898 ppm lasting ≈ 2.48 h.

Extended Orbital Architecture

Planet / star radius ratio

0.040130

Semi-major axis / stellar radius

31.380

Impact parameter (b)

0.090

Transit mid-time (BJD)

2,455,008.7135

Angular separation (arcsec)

0.18200

Eq. Temperature

460K

(187 °C)

Insolation (S⊕)

15.41

Earth = 1.00

Earth Similarity (ESI)

0.442

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. 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-83 c · Sub-Neptune Kepler-32 d · 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