Key parameters at a glance

A radius of 2.95 Earth radii
A mass of 8.99 Earth masses
Surface gravity around 1.04 g
An orbital period of 19.656 days
Semi-major axis 0.1335 AU
Equilibrium temperature 549 K (276 °C)
Distance from Earth 2,633.08 light-years
Earth Similarity Index 0.428
Travel time at Voyager 1 speed 46,434,425 years

Kepler-1757 b Planet Profile

Physical Specs

Radius

2.95 R⊕

Radius (Jupiter)

0.263 R♃

Mass

8.99 M⊕

Mass (Jupiter)

0.028 M♃

Density

1.93 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.428

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

#566of 1978

top 28.6%

This planet

2.95R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-372 b 2.95 R⊕ Kepler-1889 b 2.94 R⊕ Kepler-344 c 2.95 R⊕

Metric	Earth	Kepler-1757 b	Jupiter
Radius (R⊕)	1.00	2.95	11.21
Mass (M⊕)	1.00	8.99	317.83
Density (g/cm³)	5.51	1.93	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	21.50	0.037

Star Catalogue Identifiers

TIC

TIC 273378480

Gaia DR2

Gaia DR2 2086312941367921408

Gaia DR3

Gaia DR3 2086312941367921408

System

Kepler-1757

Percentile among Sub-Neptune cohort

Radius 2.947 R⊕ · percentile 71 / cohort 1978

Mass 8.990 M⊕ · percentile 65 / cohort 1978

Orbital period 19.66 d · percentile 62 / cohort 1946

Distance 807.31 pc · percentile 66 / cohort 1975

ESI 0.428 · percentile 58 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.656 days

Semi-major axis

0.1335 AU

Eccentricity

0.000

Inclination

87.07 °

Year Length

A year here lasts approximately 19.66 Earth days (5.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1335 AU.

Transit Fingerprint

Depth

0.084 %

Duration

2.570 h

Impact parameter b

0.969

Rp / R★

0.031595

Transit midpoint (BJD)

2,454,973.2978

Photometric dip

Transit produces a flux drop of 843 ppm lasting ≈ 2.57 h.

Extended Orbital Architecture

Planet / star radius ratio

0.031595

Semi-major axis / stellar radius

17.600

Impact parameter (b)

0.969

Transit mid-time (BJD)

2,454,973.2978

Angular separation (arcsec)

0.16500

Eq. Temperature

549K

(276 °C)

Insolation (S⊕)

21.50

Earth = 1.00

Earth Similarity (ESI)

0.428

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-1757

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,288 K — cooler than the Sun (5,778 K)

Estimated Age

0.70 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.740 R☉

Stellar Mass

0.828 M☉

Metallicity [Fe/H]

-0.24

Extended Stellar Properties

Surface gravity (log g)

4.613 dex

Stellar density

0.318 g/cm³

Metallicity ratio

[Fe/H]

Distance

807.31 parsec

Light-years 2,633.08 ly

V-band magnitude

15.82 mag

Voyager-speed travel 46,434,425 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.210 mas

Total Proper Motion

7.266 mas/yr

PM Right Ascension

-7.26 mas/yr

PM Declination

-0.10 mas/yr

Galactic Cartesian (pc)

x = 0.318 · y = -0.604 · z = 0.731

Equatorial (J2000)

RA 297.73978° · Dec 46.94190°

Galactic ℓ, b

80.831° · 10.203°

Ecliptic λ, β

320.303° · 65.607°

HTM-20 index

1097346441