Key parameters at a glance

A radius of 1.96 Earth radii
A mass of 4.50 Earth masses
Surface gravity around 1.17 g
An orbital period of 8.827 days
Semi-major axis 0.0829 AU
Equilibrium temperature 797 K (524 °C)
Distance from Earth 3,080.67 light-years
Earth Similarity Index 0.347
Travel time at Voyager 1 speed 54,327,681 years

Kepler-1556 b Planet Profile

Physical Specs

Radius

1.96 R⊕

Radius (Jupiter)

0.175 R♃

Mass

4.50 M⊕

Mass (Jupiter)

0.014 M♃

Density

3.28 g/cm³

Surface Gravity

1.17 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.347

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

#49of 1176

top 4.1%

This planet

1.96R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-174 b 1.96 R⊕ Kepler-792 b 1.96 R⊕ Kepler-118 b 1.96 R⊕

Metric	Earth	Kepler-1556 b	Jupiter
Radius (R⊕)	1.00	1.96	11.21
Mass (M⊕)	1.00	4.50	317.83
Density (g/cm³)	5.51	3.28	1.33
Surface Gravity (g)	1.00	1.17	2.53
Insolation (S⊕)	1.00	92.14	0.037

Star Catalogue Identifiers

TIC

TIC 121603852

Gaia DR2

Gaia DR2 2101303889057595136

Gaia DR3

Gaia DR3 2101303889057595136

System

Kepler-1556

Percentile among Super-Earth cohort

Radius 1.960 R⊕ · percentile 95 / cohort 1176

Mass 4.500 M⊕ · percentile 86 / cohort 1176

Orbital period 8.83 d · percentile 61 / cohort 1164

Distance 944.54 pc · percentile 78 / cohort 1171

ESI 0.347 · percentile 49 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

8.827 days

Semi-major axis

0.0829 AU

Eccentricity

0.000

Inclination

89.57 °

Year Length

A year here lasts approximately 8.83 Earth days (2.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0829 AU.

Transit Fingerprint

Depth

0.042 %

Duration

2.086 h

Impact parameter b

0.152

Rp / R★

0.018648

Transit midpoint (BJD)

2,454,972.7355

Photometric dip

Transit produces a flux drop of 417 ppm lasting ≈ 2.09 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018648

Semi-major axis / stellar radius

32.570

Impact parameter (b)

0.152

Transit mid-time (BJD)

2,454,972.7355

Angular separation (arcsec)

0.08780

Eq. Temperature

797K

(524 °C)

Insolation (S⊕)

92.14

Earth = 1.00

Earth Similarity (ESI)

0.347

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-1556

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,608 K — cooler than the Sun (5,778 K)

Estimated Age

4.90 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.950 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

0.08

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

8.391 g/cm³

Metallicity ratio

[Fe/H]

Distance

944.54 parsec

Light-years 3,080.67 ly

V-band magnitude

15.65 mag

Voyager-speed travel 54,327,681 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.030 mas

Total Proper Motion

2.044 mas/yr

PM Right Ascension

-1.95 mas/yr

PM Declination

0.61 mas/yr

Galactic Cartesian (pc)

x = 0.241 · y = -0.725 · z = 0.646

Equatorial (J2000)

RA 288.39698° · Dec 40.21319°

Galactic ℓ, b

71.598° · 13.227°

Ecliptic λ, β

300.566° · 61.714°

HTM-20 index

-1476167501