Key parameters at a glance

A radius of 9.30 Earth radii
A mass of 63.30 Earth masses
Surface gravity around 0.73 g
An orbital period of 8.028 days
Semi-major axis 0.0787 AU
Equilibrium temperature 824 K (551 °C)
Distance from Earth 4,406.92 light-years
Earth Similarity Index 0.170
Travel time at Voyager 1 speed 77,716,066 years

Kepler-856 b Planet Profile

Physical Specs

Radius

9.30 R⊕

Radius (Jupiter)

0.830 R♃

Mass

63.30 M⊕

Mass (Jupiter)

0.199 M♃

Density

0.43 g/cm³

Surface Gravity

0.73 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.170

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

#61of 574

top 10.5%

This planet

9.30R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-530 b 9.30 R⊕ TOI-2986 b 9.29 R⊕ HD 33142 d 9.32 R⊕

Metric	Earth	Kepler-856 b	Jupiter
Radius (R⊕)	1.00	9.30	11.21
Mass (M⊕)	1.00	63.30	317.83
Density (g/cm³)	5.51	0.43	1.33
Surface Gravity (g)	1.00	0.73	2.53
Insolation (S⊕)	1.00	153.50	0.037

Star Catalogue Identifiers

TIC

TIC 159054620

Gaia DR2

Gaia DR2 2127698215436676864

Gaia DR3

Gaia DR3 2127698215436676864

System

Kepler-856

Percentile among Neptune-like cohort

Radius 9.300 R⊕ · percentile 89 / cohort 574

Mass 63.300 M⊕ · percentile 80 / cohort 574

Orbital period 8.03 d · percentile 31 / cohort 524

Distance 1,351.17 pc · percentile 81 / cohort 572

ESI 0.170 · percentile 20 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

8.028 days

Semi-major axis

0.0787 AU

Eccentricity

0.000

Inclination

88.52 °

Year Length

A year here lasts approximately 8.03 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0787 AU.

Transit Fingerprint

Depth

0.873 %

Duration

3.140 h

Impact parameter b

0.564

Rp / R★

0.091828

Transit midpoint (BJD)

2,455,193.1715

Photometric dip

Transit produces a flux drop of 8,725 ppm lasting ≈ 3.14 h.

Extended Orbital Architecture

Planet / star radius ratio

0.091828

Semi-major axis / stellar radius

18.280

Impact parameter (b)

0.564

Transit mid-time (BJD)

2,455,193.1715

Angular separation (arcsec)

0.05820

Eq. Temperature

824K

(551 °C)

Insolation (S⊕)

153.50

Earth = 1.00

Earth Similarity (ESI)

0.170

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-856

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,535 K — cooler than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.930 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

1.793 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,351.17 parsec

Light-years 4,406.92 ly

V-band magnitude

15.59 mag

Voyager-speed travel 77,716,066 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.712 mas

Total Proper Motion

9.116 mas/yr

PM Right Ascension

0.53 mas/yr

PM Declination

-9.10 mas/yr

Galactic Cartesian (pc)

x = 0.232 · y = -0.651 · z = 0.723

Equatorial (J2000)

RA 289.60384° · Dec 46.31491°

Galactic ℓ, b

77.708° · 14.925°

Ecliptic λ, β

306.837° · 67.263°

HTM-20 index

1786667879