Key parameters at a glance

A radius of 0.72 Earth radii
A mass of 0.30 Earth masses
Surface gravity around 0.58 g
An orbital period of 0.972 days
Semi-major axis 0.0184 AU
Equilibrium temperature 1,609 K (1336 °C)
Distance from Earth 2,005.30 light-years
Earth Similarity Index 0.172
Travel time at Voyager 1 speed 35,363,378 years

Kepler-1559 b Planet Profile

Physical Specs

Radius

0.72 R⊕

Radius (Jupiter)

0.064 R♃

Mass

0.30 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.40 g/cm³

Surface Gravity

0.58 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.172

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

#522of 570

top 91.4%

This planet

0.72R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Barnard b 0.72 R⊕ Kepler-1850 b 0.73 R⊕ Kepler-1339 b 0.71 R⊕

Metric	Earth	Kepler-1559 b	Jupiter
Radius (R⊕)	1.00	0.72	11.21
Mass (M⊕)	1.00	0.30	317.83
Density (g/cm³)	5.51	4.40	1.33
Surface Gravity (g)	1.00	0.58	2.53
Insolation (S⊕)	1.00	1,620.06	0.037

Star Catalogue Identifiers

TIC

TIC 63213956

Gaia DR2

Gaia DR2 2125705488052032640

Gaia DR3

Gaia DR3 2125705488052032640

System

Kepler-1559

Percentile among Rocky Terrestrial cohort

Radius 0.720 R⊕ · percentile 8 / cohort 570

Mass 0.299 M⊕ · percentile 6 / cohort 570

Orbital period 0.97 d · percentile 11 / cohort 567

Distance 614.83 pc · percentile 74 / cohort 566

ESI 0.172 · percentile 9 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.972 days

Semi-major axis

0.0184 AU

Eccentricity

0.000

Inclination

81.16 °

Year Length

A year here lasts roughly 23.3 hours long on a nearly circular orbit at a mean orbital distance of 0.0184 AU.

Transit Fingerprint

Depth

0.007 %

Duration

1.629 h

Impact parameter b

0.342

Rp / R★

0.007844

Transit midpoint (BJD)

2,454,965.1648

Photometric dip

Transit produces a flux drop of 74 ppm lasting ≈ 1.63 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007844

Semi-major axis / stellar radius

4.370

Impact parameter (b)

0.342

Transit mid-time (BJD)

2,454,965.1648

Angular separation (arcsec)

0.02980

Eq. Temperature

1,609K

(1336 °C)

Insolation (S⊕)

1,620.06

Earth = 1.00

Earth Similarity (ESI)

0.172

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-1559

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,316 K — cooler than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.860 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

1.330 g/cm³

Metallicity ratio

[Fe/H]

Distance

614.83 parsec

Light-years 2,005.30 ly

V-band magnitude

14.55 mag

Voyager-speed travel 35,363,378 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.598 mas

Total Proper Motion

37.191 mas/yr

PM Right Ascension

9.07 mas/yr

PM Declination

36.07 mas/yr

Galactic Cartesian (pc)

x = 0.282 · y = -0.687 · z = 0.670

Equatorial (J2000)

RA 292.28666° · Dec 42.07259°

Galactic ℓ, b

74.604° · 11.381°

Ecliptic λ, β

307.742° · 62.622°

HTM-20 index

-331934376