Key parameters at a glance

A radius of 3.85 Earth radii
A mass of 14.10 Earth masses
Surface gravity around 0.95 g
An orbital period of 76.422 days
Semi-major axis 0.3462 AU
Equilibrium temperature 455 K (182 °C)
Distance from Earth 4,535.39 light-years
Earth Similarity Index 0.452
Travel time at Voyager 1 speed 79,981,684 years

Kepler-1811 b Planet Profile

Physical Specs

Radius

3.85 R⊕

Radius (Jupiter)

0.343 R♃

Mass

14.10 M⊕

Mass (Jupiter)

0.045 M♃

Density

1.36 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.452

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

#46of 1978

top 2.3%

This planet

3.85R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 31527 c 3.85 R⊕ Kepler-229 d 3.85 R⊕ OGLE-2005-BLG-169L b 3.84 R⊕

Metric	Earth	Kepler-1811 b	Jupiter
Radius (R⊕)	1.00	3.85	11.21
Mass (M⊕)	1.00	14.10	317.83
Density (g/cm³)	5.51	1.36	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	10.11	0.037

Star Catalogue Identifiers

TIC

TIC 122294261

Gaia DR2

Gaia DR2 2101148411242230272

Gaia DR3

Gaia DR3 2101148411242230272

System

Kepler-1811

Percentile among Sub-Neptune cohort

Radius 3.848 R⊕ · percentile 98 / cohort 1978

Mass 14.100 M⊕ · percentile 91 / cohort 1978

Orbital period 76.42 d · percentile 91 / cohort 1946

Distance 1,390.56 pc · percentile 91 / cohort 1975

ESI 0.452 · percentile 63 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

76.422 days

Semi-major axis

0.3462 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 76.42 Earth days (20.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3462 AU.

Transit Fingerprint

Depth

0.058 %

Duration

8.066 h

Impact parameter b

0.912

Rp / R★

0.027100

Transit midpoint (BJD)

2,454,997.4838

Photometric dip

Transit produces a flux drop of 578 ppm lasting ≈ 8.07 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027100

Semi-major axis / stellar radius

34.500

Impact parameter (b)

0.912

Transit mid-time (BJD)

2,454,997.4838

Angular separation (arcsec)

0.24900

Eq. Temperature

455K

(182 °C)

Insolation (S⊕)

10.11

Earth = 1.00

Earth Similarity (ESI)

0.452

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-1811

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,561 K — cooler than the Sun (5,778 K)

Estimated Age

0.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.190 R☉

Stellar Mass

0.946 M☉

Metallicity [Fe/H]

0.16

Extended Stellar Properties

Surface gravity (log g)

4.263 dex

Stellar density

1.828 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,390.56 parsec

Light-years 4,535.39 ly

V-band magnitude

15.33 mag

Voyager-speed travel 79,981,684 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.691 mas

Total Proper Motion

4.683 mas/yr

PM Right Ascension

-0.43 mas/yr

PM Declination

-4.66 mas/yr

Galactic Cartesian (pc)

x = 0.261 · y = -0.718 · z = 0.645

Equatorial (J2000)

RA 289.97932° · Dec 40.14278°

Galactic ℓ, b

72.056° · 12.102°

Ecliptic λ, β

302.964° · 61.315°

HTM-20 index

-822061616