Key parameters at a glance

A radius of 2.28 Earth radii
A mass of 5.81 Earth masses
Surface gravity around 1.12 g
An orbital period of 105.015 days
Semi-major axis 0.4161 AU
Equilibrium temperature 406 K (133 °C)
Distance from Earth 1,634.79 light-years
Earth Similarity Index 0.614
Travel time at Voyager 1 speed 28,829,493 years

Kepler-1766 b Planet Profile

Physical Specs

Radius

2.28 R⊕

Radius (Jupiter)

0.203 R♃

Mass

5.81 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.70 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.614

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

#1549of 1978

top 78.3%

This planet

2.28R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

DMPP-6 b 2.28 R⊕ GJ 806 c 2.28 R⊕ Kepler-1020 b 2.28 R⊕

Metric	Earth	Kepler-1766 b	Jupiter
Radius (R⊕)	1.00	2.28	11.21
Mass (M⊕)	1.00	5.81	317.83
Density (g/cm³)	5.51	2.70	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	7.80	0.037

Star Catalogue Identifiers

TIC

TIC 270958237

Gaia DR2

Gaia DR2 2128151660905893504

Gaia DR3

Gaia DR3 2128151660905893504

System

Kepler-1766

Percentile among Sub-Neptune cohort

Radius 2.279 R⊕ · percentile 22 / cohort 1978

Mass 5.810 M⊕ · percentile 22 / cohort 1978

Orbital period 105.01 d · percentile 94 / cohort 1946

Distance 501.23 pc · percentile 47 / cohort 1975

ESI 0.614 · percentile 84 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

105.015 days

Semi-major axis

0.4161 AU

Eccentricity

0.000

Inclination

88.60 °

Year Length

A year here lasts approximately 105.01 Earth days (28.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4161 AU.

Transit Fingerprint

Depth

0.030 %

Duration

6.287 h

Impact parameter b

0.611

Rp / R★

0.016190

Transit midpoint (BJD)

2,455,061.9446

Photometric dip

Transit produces a flux drop of 296 ppm lasting ≈ 6.29 h.

Extended Orbital Architecture

Planet / star radius ratio

0.016190

Semi-major axis / stellar radius

39.200

Impact parameter (b)

0.611

Transit mid-time (BJD)

2,455,061.9446

Angular separation (arcsec)

0.83000

Eq. Temperature

406K

(133 °C)

Insolation (S⊕)

7.80

Earth = 1.00

Earth Similarity (ESI)

0.614

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-1766

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,868 K — hotter than the Sun (5,778 K)

Estimated Age

12.02 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.042 R☉

Stellar Mass

0.915 M☉

Metallicity [Fe/H]

-0.22

Extended Stellar Properties

Surface gravity (log g)

4.363 dex

Stellar density

0.103 g/cm³

Metallicity ratio

[Fe/H]

Distance

501.23 parsec

Light-years 1,634.79 ly

V-band magnitude

12.96 mag

Voyager-speed travel 28,829,493 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.966 mas

Total Proper Motion

9.657 mas/yr

PM Right Ascension

-9.03 mas/yr

PM Declination

-3.42 mas/yr

Galactic Cartesian (pc)

x = 0.282 · y = -0.625 · z = 0.727

Equatorial (J2000)

RA 294.27723° · Dec 46.67524°

Galactic ℓ, b

79.458° · 12.171°

Ecliptic λ, β

314.757° · 66.382°

HTM-20 index

-1097042124