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 19.129 days
Semi-major axis 0.1439 AU
Equilibrium temperature 817 K (544 °C)
Distance from Earth 2,739.71 light-years
Earth Similarity Index 0.328
Travel time at Voyager 1 speed 48,314,790 years

Kepler-813 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 0.328

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-1403 b 2.14 R⊕ GJ 433 d 2.14 R⊕

Metric	Earth	Kepler-813 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	56.04	0.037

Star Catalogue Identifiers

TIC

TIC 377782430

Gaia DR2

Gaia DR2 2131910341401451264

Gaia DR3

Gaia DR3 2131910341401451264

System

Kepler-813

Percentile among Sub-Neptune cohort

Radius 2.140 R⊕ · percentile 11 / cohort 1978

Mass 5.220 M⊕ · percentile 12 / cohort 1978

Orbital period 19.13 d · percentile 61 / cohort 1946

Distance 840.00 pc · percentile 68 / cohort 1975

ESI 0.328 · percentile 34 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.129 days

Semi-major axis

0.1439 AU

Eccentricity

0.000

Inclination

87.58 °

Year Length

A year here lasts approximately 19.13 Earth days (5.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1439 AU.

Transit Fingerprint

Depth

0.045 %

Duration

3.757 h

Impact parameter b

0.540

Rp / R★

0.021455

Transit midpoint (BJD)

2,454,972.4347

Photometric dip

Transit produces a flux drop of 451 ppm lasting ≈ 3.76 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021455

Semi-major axis / stellar radius

33.600

Impact parameter (b)

0.540

Transit mid-time (BJD)

2,454,972.4347

Angular separation (arcsec)

0.17100

Eq. Temperature

817K

(544 °C)

Insolation (S⊕)

56.04

Earth = 1.00

Earth Similarity (ESI)

0.328

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-813

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,743 K — cooler than the Sun (5,778 K)

Estimated Age

3.98 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.930 R☉

Stellar Mass

0.950 M☉

Metallicity [Fe/H]

-0.13

Extended Stellar Properties

Surface gravity (log g)

4.480 dex

Stellar density

1.986 g/cm³

Metallicity ratio

[Fe/H]

Distance

840.00 parsec

Light-years 2,739.71 ly

V-band magnitude

14.65 mag

Voyager-speed travel 48,314,790 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.943 mas

Total Proper Motion

24.427 mas/yr

PM Right Ascension

-10.08 mas/yr

PM Declination

-22.25 mas/yr

Galactic Cartesian (pc)

x = 0.179 · y = -0.639 · z = 0.748

Equatorial (J2000)

RA 285.66268° · Dec 48.43533°

Galactic ℓ, b

78.700° · 18.197°

Ecliptic λ, β

301.831° · 70.149°

HTM-20 index

-12688147