Key parameters at a glance

A radius of 1.09 Earth radii
A mass of 1.32 Earth masses
Surface gravity around 1.11 g
An orbital period of 4.457 days
Semi-major axis 0.0448 AU
Equilibrium temperature 732 K (459 °C)
Distance from Earth 1,115.92 light-years
Earth Similarity Index 0.443
Travel time at Voyager 1 speed 19,679,304 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1157 b Planet Profile

Physical Specs

Radius

1.09 R⊕

Radius (Jupiter)

0.097 R♃

Mass

1.32 M⊕

Mass (Jupiter)

0.004 M♃

Density

5.60 g/cm³

Surface Gravity

1.11 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.443

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

#240of 570

top 41.9%

This planet

1.09R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

TOI-5720 b 1.09 R⊕ Kepler-115 b 1.09 R⊕ Kepler-212 b 1.09 R⊕

Metric	Earth	Kepler-1157 b	Jupiter
Radius (R⊕)	1.00	1.09	11.21
Mass (M⊕)	1.00	1.32	317.83
Density (g/cm³)	5.51	5.60	1.33
Surface Gravity (g)	1.00	1.11	2.53
Insolation (S⊕)	1.00	95.44	0.037

Star Catalogue Identifiers

TIC

TIC 164460347

Gaia DR2

Gaia DR2 2105106687459103488

Gaia DR3

Gaia DR3 2105106687459103488

System

Kepler-1157

Percentile among Rocky Terrestrial cohort

Radius 1.090 R⊕ · percentile 56 / cohort 570

Mass 1.320 M⊕ · percentile 51 / cohort 570

Orbital period 4.46 d · percentile 49 / cohort 567

Distance 342.14 pc · percentile 46 / cohort 566

ESI 0.443 · percentile 65 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.457 days

Semi-major axis

0.0448 AU

Eccentricity

0.000

Inclination

89.31 °

Year Length

A year here lasts approximately 4.46 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0448 AU.

Transit Fingerprint

Depth

0.018 %

Duration

2.358 h

Impact parameter b

0.175

Rp / R★

0.014413

Transit midpoint (BJD)

2,454,965.1601

Photometric dip

Transit produces a flux drop of 176 ppm lasting ≈ 2.36 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014413

Semi-major axis / stellar radius

14.620

Impact parameter (b)

0.175

Transit mid-time (BJD)

2,454,965.1601

Angular separation (arcsec)

0.13100

Eq. Temperature

732K

(459 °C)

Insolation (S⊕)

95.44

Earth = 1.00

Earth Similarity (ESI)

0.443

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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-1157

Spectral Class

K-type orange

Effective Temperature

4,679 K — cooler than the Sun (5,778 K)

Estimated Age

3.39 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.710 R☉

Stellar Mass

0.760 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.620 dex

Stellar density

2.976 g/cm³

Metallicity ratio

[Fe/H]

Distance

342.14 parsec

Light-years 1,115.92 ly

V-band magnitude

14.60 mag

Voyager-speed travel 19,679,304 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.894 mas

Total Proper Motion

26.327 mas/yr

PM Right Ascension

-20.75 mas/yr

PM Declination

-16.20 mas/yr

Galactic Cartesian (pc)

x = 0.165 · y = -0.706 · z = 0.689

Equatorial (J2000)

RA 283.12093° · Dec 43.52557°

Galactic ℓ, b

73.210° · 18.124°

Ecliptic λ, β

293.754° · 65.886°

HTM-20 index

693245287