Key parameters at a glance

A radius of 2.83 Earth radii
A mass of 8.40 Earth masses
Surface gravity around 1.05 g
An orbital period of 16.218 days
Semi-major axis 0.1201 AU
Equilibrium temperature 664 K (391 °C)
Distance from Earth 3,173.89 light-years
Earth Similarity Index 0.363
Travel time at Voyager 1 speed 55,971,592 years

Kepler-555 b Planet Profile

Physical Specs

Radius

2.83 R⊕

Radius (Jupiter)

0.252 R♃

Mass

8.40 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.04 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.363

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

#703of 1978

top 35.5%

This planet

2.83R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 3167 e 2.83 R⊕ GJ 3634 b 2.83 R⊕ Kepler-1099 b 2.83 R⊕

Metric	Earth	Kepler-555 b	Jupiter
Radius (R⊕)	1.00	2.83	11.21
Mass (M⊕)	1.00	8.40	317.83
Density (g/cm³)	5.51	2.04	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	129.37	0.037

Star Catalogue Identifiers

TIC

TIC 120572779

Gaia DR2

Gaia DR2 2100232689851871488

Gaia DR3

Gaia DR3 2100232689851871488

System

Kepler-555

Percentile among Sub-Neptune cohort

Radius 2.830 R⊕ · percentile 64 / cohort 1978

Mass 8.400 M⊕ · percentile 58 / cohort 1978

Orbital period 16.22 d · percentile 54 / cohort 1946

Distance 973.12 pc · percentile 76 / cohort 1975

ESI 0.363 · percentile 44 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

16.218 days

Semi-major axis

0.1201 AU

Eccentricity

0.000

Inclination

89.21 °

Year Length

A year here lasts approximately 16.22 Earth days (4.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1201 AU.

Transit Fingerprint

Depth

0.076 %

Duration

4.930 h

Impact parameter b

0.875

Rp / R★

0.025471

Transit midpoint (BJD)

2,455,013.0420

Photometric dip

Transit produces a flux drop of 758 ppm lasting ≈ 4.93 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025471

Semi-major axis / stellar radius

12.550

Impact parameter (b)

0.875

Transit mid-time (BJD)

2,455,013.0420

Angular separation (arcsec)

0.12300

Eq. Temperature

664K

(391 °C)

Insolation (S⊕)

129.37

Earth = 1.00

Earth Similarity (ESI)

0.363

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-555

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,894 K — hotter than the Sun (5,778 K)

Estimated Age

3.89 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.040 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

1.041 g/cm³

Metallicity ratio

[Fe/H]

Distance

973.12 parsec

Light-years 3,173.89 ly

V-band magnitude

14.45 mag

Voyager-speed travel 55,971,592 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

0.999 mas

Total Proper Motion

12.448 mas/yr

PM Right Ascension

3.45 mas/yr

PM Declination

11.96 mas/yr

Galactic Cartesian (pc)

x = 0.208 · y = -0.750 · z = 0.628

Equatorial (J2000)

RA 285.51687° · Dec 38.93246°

Galactic ℓ, b

69.467° · 14.741°

Ecliptic λ, β

295.424° · 61.009°

HTM-20 index

320088769