Key parameters at a glance

A radius of 8.35 Earth radii
A mass of 52.70 Earth masses
Surface gravity around 0.76 g
An orbital period of 7.887 days
Semi-major axis 0.0762 AU
Equilibrium temperature 996 K (723 °C)
Distance from Earth 4,913.80 light-years
Earth Similarity Index 0.147
Travel time at Voyager 1 speed 86,654,877 years

Kepler-855 b Planet Profile

Physical Specs

Radius

8.35 R⊕

Radius (Jupiter)

0.745 R♃

Mass

52.70 M⊕

Mass (Jupiter)

0.166 M♃

Density

0.50 g/cm³

Surface Gravity

0.76 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.147

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

#134of 574

top 23.2%

This planet

8.35R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-762 A b 8.34 R⊕ K2-127 b 8.37 R⊕ Kepler-539 b 8.37 R⊕

Metric	Earth	Kepler-855 b	Jupiter
Radius (R⊕)	1.00	8.35	11.21
Mass (M⊕)	1.00	52.70	317.83
Density (g/cm³)	5.51	0.50	1.33
Surface Gravity (g)	1.00	0.76	2.53
Insolation (S⊕)	1.00	405.18	0.037

Star Catalogue Identifiers

TIC

TIC 271431851

Gaia DR2

Gaia DR2 2078088005976092416

Gaia DR3

Gaia DR3 2078088005976092416

System

Kepler-855

Percentile among Neptune-like cohort

Radius 8.350 R⊕ · percentile 77 / cohort 574

Mass 52.700 M⊕ · percentile 72 / cohort 574

Orbital period 7.89 d · percentile 30 / cohort 524

Distance 1,506.58 pc · percentile 85 / cohort 572

ESI 0.147 · percentile 13 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

7.887 days

Semi-major axis

0.0762 AU

Eccentricity

0.000

Inclination

89.78 °

Year Length

A year here lasts approximately 7.89 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0762 AU.

Transit Fingerprint

Depth

0.668 %

Duration

5.219 h

Impact parameter b

0.001

Rp / R★

0.074484

Transit midpoint (BJD)

2,455,193.5143

Photometric dip

Transit produces a flux drop of 6,682 ppm lasting ≈ 5.22 h.

Extended Orbital Architecture

Planet / star radius ratio

0.074484

Semi-major axis / stellar radius

12.420

Impact parameter (b)

0.001

Transit mid-time (BJD)

2,455,193.5143

Angular separation (arcsec)

0.05060

Eq. Temperature

996K

(723 °C)

Insolation (S⊕)

405.18

Earth = 1.00

Earth Similarity (ESI)

0.147

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-855

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,835 K — hotter than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.030 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

0.583 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,506.58 parsec

Light-years 4,913.80 ly

V-band magnitude

15.16 mag

Voyager-speed travel 86,654,877 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.636 mas

Total Proper Motion

4.440 mas/yr

PM Right Ascension

-4.26 mas/yr

PM Declination

-1.24 mas/yr

Galactic Cartesian (pc)

x = 0.307 · y = -0.656 · z = 0.689

Equatorial (J2000)

RA 295.09496° · Dec 43.53757°

Galactic ℓ, b

76.888° · 10.216°

Ecliptic λ, β

313.116° · 63.269°

HTM-20 index

-1426557160