Key parameters at a glance

A radius of 3.01 Earth radii
A mass of 9.32 Earth masses
Surface gravity around 1.03 g
An orbital period of 27.496 days
Semi-major axis 0.1629 AU
Equilibrium temperature 590 K (317 °C)
Distance from Earth 3,204.52 light-years
Earth Similarity Index 0.397
Travel time at Voyager 1 speed 56,511,624 years

Kepler-1056 b Planet Profile

Physical Specs

Radius

3.01 R⊕

Radius (Jupiter)

0.269 R♃

Mass

9.32 M⊕

Mass (Jupiter)

0.029 M♃

Density

1.88 g/cm³

Surface Gravity

1.03 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.397

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

#509of 1978

top 25.7%

This planet

3.01R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-679 b 3.01 R⊕ Kepler-1036 b 3.01 R⊕ Kepler-414 c 3.01 R⊕

Metric	Earth	Kepler-1056 b	Jupiter
Radius (R⊕)	1.00	3.01	11.21
Mass (M⊕)	1.00	9.32	317.83
Density (g/cm³)	5.51	1.88	1.33
Surface Gravity (g)	1.00	1.03	2.53
Insolation (S⊕)	1.00	56.91	0.037

Star Catalogue Identifiers

TIC

TIC 268935452

Gaia DR2

Gaia DR2 2085599186522693632

Gaia DR3

Gaia DR3 2085599186522693632

System

Kepler-1056

Percentile among Sub-Neptune cohort

Radius 3.010 R⊕ · percentile 74 / cohort 1978

Mass 9.320 M⊕ · percentile 68 / cohort 1978

Orbital period 27.50 d · percentile 71 / cohort 1946

Distance 982.51 pc · percentile 77 / cohort 1975

ESI 0.397 · percentile 51 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

27.496 days

Semi-major axis

0.1629 AU

Eccentricity

0.000

Inclination

88.87 °

Year Length

A year here lasts approximately 27.50 Earth days (7.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1629 AU.

Transit Fingerprint

Depth

0.048 %

Duration

5.024 h

Impact parameter b

0.664

Rp / R★

0.023349

Transit midpoint (BJD)

2,454,966.2837

Photometric dip

Transit produces a flux drop of 483 ppm lasting ≈ 5.02 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023349

Semi-major axis / stellar radius

26.900

Impact parameter (b)

0.664

Transit mid-time (BJD)

2,454,966.2837

Angular separation (arcsec)

0.16600

Eq. Temperature

590K

(317 °C)

Insolation (S⊕)

56.91

Earth = 1.00

Earth Similarity (ESI)

0.397

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-1056

Spectral Class

F-type yellow-white

Effective Temperature

6,127 K — hotter than the Sun (5,778 K)

Estimated Age

2.95 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.200 R☉

Stellar Mass

1.120 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.330 dex

Stellar density

0.946 g/cm³

Metallicity ratio

[Fe/H]

Distance

982.51 parsec

Light-years 3,204.52 ly

V-band magnitude

14.77 mag

Voyager-speed travel 56,511,624 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.989 mas

Total Proper Motion

1.457 mas/yr

PM Right Ascension

-1.42 mas/yr

PM Declination

0.32 mas/yr

Galactic Cartesian (pc)

x = 0.337 · y = -0.595 · z = 0.730

Equatorial (J2000)

RA 299.52598° · Dec 46.89926°

Galactic ℓ, b

81.406° · 9.122°

Ecliptic λ, β

322.855° · 65.012°

HTM-20 index

89218578