Key parameters at a glance

A radius of 2.14 Earth radii
A mass of 5.22 Earth masses
Surface gravity around 1.14 g
An orbital period of 31.057 days
Semi-major axis 0.1803 AU
Equilibrium temperature 480 K (207 °C)
Distance from Earth 3,260.39 light-years
Earth Similarity Index 0.545
Travel time at Voyager 1 speed 57,496,901 years

Kepler-1236 b Planet Profile

Physical Specs

Radius

2.14 R⊕

Radius (Jupiter)

0.191 R♃

Mass

5.22 M⊕

Mass (Jupiter)

0.016 M♃

Density

2.93 g/cm³

Surface Gravity

1.14 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.545

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1755of 1978

top 88.7%

This planet

2.14R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-437 b 2.14 R⊕ Kepler-813 b 2.14 R⊕ GJ 433 d 2.14 R⊕

Metric	Earth	Kepler-1236 b	Jupiter
Radius (R⊕)	1.00	2.14	11.21
Mass (M⊕)	1.00	5.22	317.83
Density (g/cm³)	5.51	2.93	1.33
Surface Gravity (g)	1.00	1.14	2.53
Insolation (S⊕)	1.00	13.57	0.037

Star Catalogue Identifiers

TIC

TIC 271758949

Gaia DR2

Gaia DR2 2077894736749534080

Gaia DR3

Gaia DR3 2077894736749534080

System

Kepler-1236

Percentile among Sub-Neptune cohort

Radius 2.140 R⊕ · percentile 11 / cohort 1978

Mass 5.220 M⊕ · percentile 12 / cohort 1978

Orbital period 31.06 d · percentile 74 / cohort 1946

Distance 999.64 pc · percentile 78 / cohort 1975

ESI 0.545 · percentile 76 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

31.057 days

Semi-major axis

0.1803 AU

Eccentricity

0.000

Inclination

89.72 °

Year Length

A year here lasts approximately 31.06 Earth days (8.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1803 AU.

Transit Fingerprint

Depth

0.064 %

Duration

3.401 h

Impact parameter b

0.335

Rp / R★

0.023593

Transit midpoint (BJD)

2,454,980.5629

Photometric dip

Transit produces a flux drop of 637 ppm lasting ≈ 3.40 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023593

Semi-major axis / stellar radius

67.400

Impact parameter (b)

0.335

Transit mid-time (BJD)

2,454,980.5629

Angular separation (arcsec)

0.18000

Eq. Temperature

480K

(207 °C)

Insolation (S⊕)

13.57

Earth = 1.00

Earth Similarity (ESI)

0.545

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1236

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,337 K — cooler than the Sun (5,778 K)

Estimated Age

4.07 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.860 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

6.015 g/cm³

Metallicity ratio

[Fe/H]

Distance

999.64 parsec

Light-years 3,260.39 ly

V-band magnitude

16.15 mag

Voyager-speed travel 57,496,901 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.973 mas

Total Proper Motion

2.939 mas/yr

PM Right Ascension

2.54 mas/yr

PM Declination

-1.48 mas/yr

Galactic Cartesian (pc)

x = 0.319 · y = -0.664 · z = 0.676

Equatorial (J2000)

RA 295.62474° · Dec 42.54587°

Galactic ℓ, b

76.186° · 9.407°

Ecliptic λ, β

313.096° · 62.204°

HTM-20 index

-1546889888