Key parameters at a glance

A radius of 4.07 Earth radii
A mass of 12.15 Earth masses
Surface gravity around 0.73 g
An orbital period of 26.440 days
Semi-major axis 0.1683 AU
Equilibrium temperature 562 K (289 °C)
Distance from Earth 2,949.51 light-years
Earth Similarity Index 0.350
Travel time at Voyager 1 speed 52,014,668 years

4 siblings around Kepler-82

Kepler-82 b shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-82 d	Super-Earth	1.77	885.10	2.383	1,253	2014
Kepler-82 e	Sub-Neptune	2.47	254.02	5.902	926	2014
Kepler-82 b this	Neptune-like	4.07	12.15	26.440	562	2012
Kepler-82 c	Neptune-like	5.34	13.90	51.540	450	2012
Kepler-82 f	Neptune-like	4.84	20.90	75.732	—	2019

Kepler-82 b Planet Profile

Physical Specs

Radius

4.07 R⊕

Radius (Jupiter)

0.363 R♃

Mass

12.15 M⊕

Mass (Jupiter)

0.038 M♃

Density

0.98 g/cm³

Surface Gravity

0.73 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.350

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

#551of 574

top 95.8%

This planet

4.07R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-248 c 4.07 R⊕ HD 125612 c 4.07 R⊕ Kepler-302 b 4.06 R⊕

Metric	Earth	Kepler-82 b	Jupiter
Radius (R⊕)	1.00	4.07	11.21
Mass (M⊕)	1.00	12.15	317.83
Density (g/cm³)	5.51	0.98	1.33
Surface Gravity (g)	1.00	0.73	2.53
Insolation (S⊕)	1.00	19.56	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	12.150 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 63372898

Gaia DR2

Gaia DR2 2125850623586710400

Gaia DR3

Gaia DR3 2125850623586710400

System

Kepler-82

Percentile among Neptune-like cohort

Radius 4.070 R⊕ · percentile 4 / cohort 574

Mass 12.150 M⊕ · percentile 5 / cohort 574

Orbital period 26.44 d · percentile 57 / cohort 524

Distance 904.33 pc · percentile 70 / cohort 572

ESI 0.350 · percentile 63 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

26.440 days

Semi-major axis

0.1683 AU

Eccentricity

0.003

Inclination

89.05 °

Year Length

A year here lasts approximately 26.44 Earth days (7.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1683 AU.

Transit Fingerprint

Depth

0.184 %

Duration

3.978 h

Impact parameter b

0.641

Rp / R★

0.041590

Transit midpoint (BJD)

2,455,027.1207

Photometric dip

Transit produces a flux drop of 1,844 ppm lasting ≈ 3.98 h.

Extended Orbital Architecture

Planet / star radius ratio

0.041590

Semi-major axis / stellar radius

41.470

Impact parameter (b)

0.641

Transit mid-time (BJD)

2,455,027.1207

Long. of periastron (ω)

236.00°

Angular separation (arcsec)

0.18600

Eq. Temperature

562K

(289 °C)

Insolation (S⊕)

19.56

Earth = 1.00

Earth Similarity (ESI)

0.350

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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-83 b · Sub-Neptune Kepler-54 b · Sub-Neptune Kepler-80 c · Sub-Neptune

Host System: Kepler-82

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,401 K — cooler than the Sun (5,778 K)

Estimated Age

1.41 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.898 R☉

Stellar Mass

0.910 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

1.770 g/cm³

Metallicity ratio

[M/H]

Distance

904.33 parsec

Light-years 2,949.51 ly

V-band magnitude

15.13 mag

Voyager-speed travel 52,014,668 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.078 mas

Total Proper Motion

6.606 mas/yr

PM Right Ascension

0.19 mas/yr

PM Declination

6.60 mas/yr

Galactic Cartesian (pc)

x = 0.284 · y = -0.674 · z = 0.682

Equatorial (J2000)

RA 292.87337° · Dec 42.96616°

Galactic ℓ, b

75.617° · 11.393°

Ecliptic λ, β

309.299° · 63.318°

HTM-20 index

-34433629