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 8.943 days
Semi-major axis 0.0831 AU
Equilibrium temperature 946 K (673 °C)
Distance from Earth 2,783.01 light-years
Earth Similarity Index 0.290
Travel time at Voyager 1 speed 49,078,336 years

Kepler-1857 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 0.290

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#48of 1176

top 4.0%

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-1857 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	217.40	0.037

Star Catalogue Identifiers

TIC

TIC 184556217

Gaia DR2

Gaia DR2 2073303313639459840

Gaia DR3

Gaia DR3 2073303313639459840

System

Kepler-1857

Percentile among Super-Earth cohort

Radius 1.961 R⊕ · percentile 96 / cohort 1176

Mass 4.500 M⊕ · percentile 86 / cohort 1176

Orbital period 8.94 d · percentile 62 / cohort 1164

Distance 853.28 pc · percentile 72 / cohort 1171

ESI 0.290 · percentile 34 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

8.943 days

Semi-major axis

0.0831 AU

Eccentricity

0.000

Inclination

89.66 °

Year Length

A year here lasts approximately 8.94 Earth days (2.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0831 AU.

Transit Fingerprint

Depth

0.022 %

Duration

2.469 h

Impact parameter b

0.036

Rp / R★

0.013638

Transit midpoint (BJD)

2,454,970.2988

Photometric dip

Transit produces a flux drop of 215 ppm lasting ≈ 2.47 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013638

Semi-major axis / stellar radius

27.680

Impact parameter (b)

0.036

Transit mid-time (BJD)

2,454,970.2988

Angular separation (arcsec)

0.09740

Eq. Temperature

946K

(673 °C)

Insolation (S⊕)

217.40

Earth = 1.00

Earth Similarity (ESI)

0.290

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

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1857

Spectral Class

F-type yellow-white

Effective Temperature

6,074 K — hotter than the Sun (5,778 K)

Estimated Age

7.94 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.005 R☉

Stellar Mass

0.873 M☉

Metallicity [Fe/H]

-0.54

Extended Stellar Properties

Surface gravity (log g)

4.375 dex

Stellar density

5.018 g/cm³

Metallicity ratio

[Fe/H]

Distance

853.28 parsec

Light-years 2,783.01 ly

V-band magnitude

14.36 mag

Voyager-speed travel 49,078,336 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.144 mas

Total Proper Motion

15.091 mas/yr

PM Right Ascension

-5.37 mas/yr

PM Declination

-14.10 mas/yr

Galactic Cartesian (pc)

x = 0.343 · y = -0.690 · z = 0.637

Equatorial (J2000)

RA 296.45571° · Dec 39.59854°

Galactic ℓ, b

73.881° · 7.437°

Ecliptic λ, β

312.137° · 59.228°

HTM-20 index

-1110888939