Key parameters at a glance

A radius of 6.09 Earth radii
A mass of 30.80 Earth masses
Surface gravity around 0.83 g
An orbital period of 127.834 days
Semi-major axis 0.5600 AU
Equilibrium temperature 554 K (281 °C)
Distance from Earth 4,524.44 light-years
Earth Similarity Index 0.308
Travel time at Voyager 1 speed 79,788,425 years

Kepler-820 b Planet Profile

Physical Specs

Radius

6.09 R⊕

Radius (Jupiter)

0.543 R♃

Mass

30.80 M⊕

Mass (Jupiter)

0.097 M♃

Density

0.75 g/cm³

Surface Gravity

0.83 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.308

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

#275of 574

top 47.7%

This planet

6.09R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 115404 A b 6.09 R⊕ K2-157 c 6.08 R⊕ HD 34445 d 6.07 R⊕

Metric	Earth	Kepler-820 b	Jupiter
Radius (R⊕)	1.00	6.09	11.21
Mass (M⊕)	1.00	30.80	317.83
Density (g/cm³)	5.51	0.75	1.33
Surface Gravity (g)	1.00	0.83	2.53
Insolation (S⊕)	1.00	16.23	0.037

Star Catalogue Identifiers

TIC

TIC 122685803

Gaia DR2

Gaia DR2 2052968773786517760

Gaia DR3

Gaia DR3 2052968773786517760

System

Kepler-820

Percentile among Neptune-like cohort

Radius 6.090 R⊕ · percentile 52 / cohort 574

Mass 30.800 M⊕ · percentile 51 / cohort 574

Orbital period 127.83 d · percentile 85 / cohort 524

Distance 1,387.20 pc · percentile 82 / cohort 572

ESI 0.308 · percentile 51 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

127.834 days

Semi-major axis

0.5600 AU

Eccentricity

0.000

Inclination

89.72 °

Year Length

A year here lasts approximately 127.83 Earth days (35.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5600 AU.

Transit Fingerprint

Depth

0.192 %

Duration

10.877 h

Impact parameter b

0.887

Rp / R★

0.041035

Transit midpoint (BJD)

2,455,126.4178

Photometric dip

Transit produces a flux drop of 1,919 ppm lasting ≈ 10.88 h.

Extended Orbital Architecture

Planet / star radius ratio

0.041035

Semi-major axis / stellar radius

43.800

Impact parameter (b)

0.887

Transit mid-time (BJD)

2,455,126.4178

Angular separation (arcsec)

0.40400

Eq. Temperature

554K

(281 °C)

Insolation (S⊕)

16.23

Earth = 1.00

Earth Similarity (ESI)

0.308

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-820

Spectral Class

F-type yellow-white

Effective Temperature

6,260 K — hotter than the Sun (5,778 K)

Estimated Age

2.63 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.360 R☉

Stellar Mass

1.230 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.250 dex

Stellar density

0.250 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,387.20 parsec

Light-years 4,524.44 ly

V-band magnitude

14.14 mag

Voyager-speed travel 79,788,425 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.692 mas

Total Proper Motion

8.527 mas/yr

PM Right Ascension

-2.98 mas/yr

PM Declination

-7.99 mas/yr

Galactic Cartesian (pc)

x = 0.278 · y = -0.723 · z = 0.632

Equatorial (J2000)

RA 291.02015° · Dec 39.22061°

Galactic ℓ, b

71.564° · 10.979°

Ecliptic λ, β

303.997° · 60.203°

HTM-20 index

1440949007