Key parameters at a glance

A radius of 2.73 Earth radii
A mass of 7.90 Earth masses
Surface gravity around 1.06 g
An orbital period of 64.002 days
Semi-major axis 0.3390 AU
Equilibrium temperature 322 K (49 °C)
Distance from Earth 1,920.63 light-years
Earth Similarity Index 0.685
Travel time at Voyager 1 speed 33,870,221 years

Context from the literature

The list of exoplanets detected by the Kepler space telescope contains bodies with a wide variety of properties, with significant ranges in orbital distances, masses, radii, composition, habitability, and host star type. As of June 16 2023, the Kepler space telescope and its follow-up observations have detected 2,778 planets, including hot Jupiters, super-Earths, circumbinary planets, and planets located in the circumstellar habitable zones of their host stars. Kepler has detected over 3,601 unconfirmed planet candidates and 2,165 eclipsing binary stars.

Excerpted from Wikipedia · full article

1 sibling around Kepler-436

Kepler-436 b 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-436 c	Sub-Neptune	2.33	6.04	16.797	503	2016
Kepler-436 b this	Sub-Neptune	2.73	7.90	64.002	322	2015

Kepler-436 b Planet Profile

Physical Specs

Radius

2.73 R⊕

Radius (Jupiter)

0.240 R♃

Mass

7.90 M⊕

Mass (Jupiter)

0.025 M♃

Density

2.13 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.685

HZ Position Inner

Controversial No

Discovery

Year 2015

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#823of 1978

top 41.6%

This planet

2.73R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-385 b 2.73 R⊕ Kepler-506 b 2.73 R⊕ Kepler-221 d 2.73 R⊕

Metric	Earth	Kepler-436 b	Jupiter
Radius (R⊕)	1.00	2.73	11.21
Mass (M⊕)	1.00	7.90	317.83
Density (g/cm³)	5.51	2.13	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	1.69	0.037

Star Catalogue Identifiers

TIC

TIC 185408817

Gaia DR2

Gaia DR2 2081897989863673216

Gaia DR3

Gaia DR3 2081897989863673216

System

Kepler-436

Percentile among Sub-Neptune cohort

Radius 2.730 R⊕ · percentile 58 / cohort 1978

Mass 7.900 M⊕ · percentile 53 / cohort 1978

Orbital period 64.00 d · percentile 90 / cohort 1946

Distance 588.87 pc · percentile 52 / cohort 1975

ESI 0.685 · percentile 91 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

64.002 days

Semi-major axis

0.3390 AU

Eccentricity

0.190

Inclination

89.93 °

Year Length

A year here lasts approximately 64.00 Earth days (17.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.3390 AU.

Transit Fingerprint

Depth

0.111 %

Duration

4.670 h

Impact parameter b

0.090

Rp / R★

0.035400

Transit midpoint (BJD)

2,455,477.6307

Photometric dip

Transit produces a flux drop of 1,113 ppm lasting ≈ 4.67 h.

Extended Orbital Architecture

Planet / star radius ratio

0.035400

Semi-major axis / stellar radius

104.000

Impact parameter (b)

0.090

Transit mid-time (BJD)

2,455,477.6307

Angular separation (arcsec)

0.57600

Eq. Temperature

322K

(49 °C)

Insolation (S⊕)

1.69

Earth = 1.00

Earth Similarity (ESI)

0.685

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

Discovery Paper

Primary reference

Torres et al. 2015

Instrument

Kepler CCD Array

Publication

2015-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2015 at Kepler (12 shown).

Kepler-438 b · Rocky Terrestrial Kepler-445 d · Super-Earth Kepler-442 b · Super-Earth Kepler-439 b · Sub-Neptune Kepler-437 b · Sub-Neptune Kepler-440 b · Super-Earth KIC 8540376 c · Sub-Neptune Kepler-445 b · Super-Earth Kepler-446 d · Super-Earth Kepler-445 c · Sub-Neptune Kepler-443 b · Sub-Neptune Kepler-441 b · Super-Earth

Host System: Kepler-436

Spectral Class

K-type orange

Effective Temperature

4,651 K — cooler than the Sun (5,778 K)

Estimated Age

3.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.697 R☉

Stellar Mass

0.729 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.619 dex

Stellar density

3.030 g/cm³

Metallicity ratio

[Fe/H]

Distance

588.87 parsec

Light-years 1,920.63 ly

V-band magnitude

15.97 mag

Voyager-speed travel 33,870,221 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.671 mas

Total Proper Motion

5.588 mas/yr

PM Right Ascension

5.36 mas/yr

PM Declination

1.57 mas/yr

Galactic Cartesian (pc)

x = 0.376 · y = -0.608 · z = 0.700

Equatorial (J2000)

RA 301.72078° · Dec 44.41209°

Galactic ℓ, b

80.059° · 6.522°

Ecliptic λ, β

323.378° · 62.100°

HTM-20 index

-611529180

Wikipedia → Image: Wikimedia Commons · NASA Ames/JPL-Caltech · Public domain

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