Key parameters at a glance

A radius of 3.61 Earth radii
A mass of 12.70 Earth masses
Surface gravity around 0.97 g
An orbital period of 17.588 days
Semi-major axis 0.1277 AU
Equilibrium temperature 706 K (433 °C)
Distance from Earth 2,533.28 light-years
Earth Similarity Index 0.309
Travel time at Voyager 1 speed 44,674,386 years

Kepler-559 b Planet Profile

Physical Specs

Radius

3.61 R⊕

Radius (Jupiter)

0.322 R♃

Mass

12.70 M⊕

Mass (Jupiter)

0.040 M♃

Density

1.48 g/cm³

Surface Gravity

0.97 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.309

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

#132of 1978

top 6.6%

This planet

3.61R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HIP 35173 b 3.61 R⊕ Kepler-258 c 3.61 R⊕ Kepler-869 b 3.61 R⊕

Metric	Earth	Kepler-559 b	Jupiter
Radius (R⊕)	1.00	3.61	11.21
Mass (M⊕)	1.00	12.70	317.83
Density (g/cm³)	5.51	1.48	1.33
Surface Gravity (g)	1.00	0.97	2.53
Insolation (S⊕)	1.00	42.54	0.037

Star Catalogue Identifiers

TIC

TIC 272488625

Gaia DR2

Gaia DR2 2078818944993952256

Gaia DR3

Gaia DR3 2078818944993952256

System

Kepler-559

Percentile among Sub-Neptune cohort

Radius 3.610 R⊕ · percentile 93 / cohort 1978

Mass 12.700 M⊕ · percentile 86 / cohort 1978

Orbital period 17.59 d · percentile 57 / cohort 1946

Distance 776.71 pc · percentile 64 / cohort 1975

ESI 0.309 · percentile 30 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

17.588 days

Semi-major axis

0.1277 AU

Eccentricity

0.000

Inclination

89.81 °

Year Length

A year here lasts approximately 17.59 Earth days (4.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1277 AU.

Transit Fingerprint

Depth

0.138 %

Duration

4.382 h

Impact parameter b

0.106

Rp / R★

0.034719

Transit midpoint (BJD)

2,455,009.0774

Photometric dip

Transit produces a flux drop of 1,378 ppm lasting ≈ 4.38 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034719

Semi-major axis / stellar radius

31.560

Impact parameter (b)

0.106

Transit mid-time (BJD)

2,455,009.0774

Angular separation (arcsec)

0.16400

Eq. Temperature

706K

(433 °C)

Insolation (S⊕)

42.54

Earth = 1.00

Earth Similarity (ESI)

0.309

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-559

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,630 K — cooler than the Sun (5,778 K)

Estimated Age

4.37 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.950 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.922 g/cm³

Metallicity ratio

[Fe/H]

Distance

776.71 parsec

Light-years 2,533.28 ly

V-band magnitude

14.86 mag

Voyager-speed travel 44,674,386 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.259 mas

Total Proper Motion

9.317 mas/yr

PM Right Ascension

9.07 mas/yr

PM Declination

2.14 mas/yr

Galactic Cartesian (pc)

x = 0.324 · y = -0.645 · z = 0.692

Equatorial (J2000)

RA 296.63689° · Dec 43.80279°

Galactic ℓ, b

77.663° · 9.361°

Ecliptic λ, β

315.624° · 63.085°

HTM-20 index

1491970964