Key parameters at a glance

A radius of 3.68 Earth radii
A mass of 7.13 Earth masses
Surface gravity around 0.53 g
An orbital period of 16.219 days
Semi-major axis 0.1269 AU
Equilibrium temperature 928 K (655 °C)
Distance from Earth 1,721.96 light-years
Earth Similarity Index 0.209
Travel time at Voyager 1 speed 30,366,766 years

1 sibling around Kepler-36

Kepler-36 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-36 b	Super-Earth	1.50	3.83	13.868	978	2012
Kepler-36 c this	Sub-Neptune	3.68	7.13	16.219	928	2012

Kepler-36 c Planet Profile

Physical Specs

Radius

3.68 R⊕

Radius (Jupiter)

0.328 R♃

Mass

7.13 M⊕

Mass (Jupiter)

0.022 M♃

Density

0.79 g/cm³

Surface Gravity

0.53 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.209

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

#103of 1978

top 5.2%

This planet

3.68R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-19 c 3.68 R⊕ Kepler-318 c 3.68 R⊕ Kepler-698 b 3.68 R⊕

Metric	Earth	Kepler-36 c	Jupiter
Radius (R⊕)	1.00	3.68	11.21
Mass (M⊕)	1.00	7.13	317.83
Density (g/cm³)	5.51	0.79	1.33
Surface Gravity (g)	1.00	0.53	2.53
Insolation (S⊕)	1.00	191.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7.130 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	16.273 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 350810590

Gaia DR2

Gaia DR2 2129931456691176576

Gaia DR3

Gaia DR3 2129931456691176576

System

Kepler-36

Percentile among Sub-Neptune cohort

Radius 3.679 R⊕ · percentile 95 / cohort 1978

Mass 7.130 M⊕ · percentile 42 / cohort 1978

Orbital period 16.22 d · percentile 54 / cohort 1946

Distance 527.96 pc · percentile 49 / cohort 1975

ESI 0.209 · percentile 8 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

16.219 days

Semi-major axis

0.1269 AU

Eccentricity

0.000

Inclination

89.36 °

Year Length

A year here lasts approximately 16.22 Earth days (4.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1269 AU.

Transit Fingerprint

Depth

0.043 %

Duration

7.460 h

Impact parameter b

0.186

Rp / R★

0.020620

Transit midpoint (BJD)

2,455,004.6774

Photometric dip

Transit produces a flux drop of 425 ppm lasting ≈ 7.46 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020620

Semi-major axis / stellar radius

16.690

Impact parameter (b)

0.186

RV semi-amplitude (K)

4.017 m/s

Transit mid-time (BJD)

2,455,004.6774

Angular separation (arcsec)

0.24000

Eq. Temperature

928K

(655 °C)

Insolation (S⊕)

191.00

Earth = 1.00

Earth Similarity (ESI)

0.209

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

Carter et al. 2012

Instrument

Kepler CCD Array

Publication

2012-08

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-36

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,979 K — hotter than the Sun (5,778 K)

Estimated Age

7.41 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.634 R☉

Stellar Mass

1.034 M☉

Metallicity [Fe/H]

-0.18

Extended Stellar Properties

Surface gravity (log g)

4.100 dex

Stellar density

0.351 g/cm³

Systemic radial velocity

9.39 km/s

Rotational v·sin i

4.90 km/s

Metallicity ratio

[Fe/H]

Distance

527.96 parsec

Light-years 1,721.96 ly

V-band magnitude

11.94 mag

Voyager-speed travel 30,366,766 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

1.865 mas

Total Proper Motion

8.131 mas/yr

PM Right Ascension

0.97 mas/yr

PM Declination

-8.07 mas/yr

Galactic Cartesian (pc)

x = 0.237 · y = -0.609 · z = 0.757

Equatorial (J2000)

RA 291.25019° · Dec 49.23181°

Galactic ℓ, b

80.933° · 15.102°

Ecliptic λ, β

312.625° · 69.545°

HTM-20 index

865136306