Key parameters at a glance

A radius of 1.53 Earth radii
A mass of 2.96 Earth masses
Surface gravity around 1.26 g
An orbital period of 3.740 days
Semi-major axis 0.0490 AU
Equilibrium temperature 1,287 K (1014 °C)
Distance from Earth 4,501.47 light-years
Earth Similarity Index 0.224
Travel time at Voyager 1 speed 79,383,501 years

Kepler-1557 b Planet Profile

Physical Specs

Radius

1.53 R⊕

Radius (Jupiter)

0.137 R♃

Mass

2.96 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.54 g/cm³

Surface Gravity

1.26 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.224

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

#687of 1176

top 58.3%

This planet

1.53R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-228 b 1.53 R⊕ Kepler-147 b 1.53 R⊕ Kepler-296 e 1.53 R⊕

Metric	Earth	Kepler-1557 b	Jupiter
Radius (R⊕)	1.00	1.53	11.21
Mass (M⊕)	1.00	2.96	317.83
Density (g/cm³)	5.51	4.54	1.33
Surface Gravity (g)	1.00	1.26	2.53
Insolation (S⊕)	1.00	645.54	0.037

Star Catalogue Identifiers

TIC

TIC 270790313

Gaia DR2

Gaia DR2 2128204815421600512

Gaia DR3

Gaia DR3 2128204815421600512

System

Kepler-1557

Percentile among Super-Earth cohort

Radius 1.530 R⊕ · percentile 40 / cohort 1176

Mass 2.960 M⊕ · percentile 37 / cohort 1176

Orbital period 3.74 d · percentile 29 / cohort 1164

Distance 1,380.16 pc · percentile 93 / cohort 1171

ESI 0.224 · percentile 18 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

3.740 days

Semi-major axis

0.0490 AU

Eccentricity

0.000

Inclination

88.63 °

Year Length

A year here lasts approximately 3.74 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0490 AU.

Transit Fingerprint

Depth

0.017 %

Duration

2.439 h

Impact parameter b

0.277

Rp / R★

0.011999

Transit midpoint (BJD)

2,454,967.7027

Photometric dip

Transit produces a flux drop of 166 ppm lasting ≈ 2.44 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011999

Semi-major axis / stellar radius

11.730

Impact parameter (b)

0.277

Transit mid-time (BJD)

2,454,967.7027

Angular separation (arcsec)

0.03550

Eq. Temperature

1,287K

(1014 °C)

Insolation (S⊕)

645.54

Earth = 1.00

Earth Similarity (ESI)

0.224

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-1557

Spectral Class

F-type yellow-white

Effective Temperature

6,099 K — hotter than the Sun (5,778 K)

Estimated Age

3.31 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.170 R☉

Stellar Mass

1.110 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.340 dex

Stellar density

2.128 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,380.16 parsec

Light-years 4,501.47 ly

V-band magnitude

15.38 mag

Voyager-speed travel 79,383,501 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.696 mas

Total Proper Motion

8.477 mas/yr

PM Right Ascension

-3.16 mas/yr

PM Declination

-7.87 mas/yr

Galactic Cartesian (pc)

x = 0.277 · y = -0.625 · z = 0.729

Equatorial (J2000)

RA 293.88136° · Dec 46.83882°

Galactic ℓ, b

79.483° · 12.487°

Ecliptic λ, β

314.302° · 66.642°

HTM-20 index

-1281970790