Key parameters at a glance

A radius of 2.36 Earth radii
A mass of 6.15 Earth masses
Surface gravity around 1.11 g
An orbital period of 9.033 days
Semi-major axis 0.0813 AU
Equilibrium temperature 729 K (456 °C)
Distance from Earth 3,190.02 light-years
Earth Similarity Index 0.356
Travel time at Voyager 1 speed 56,256,016 years

Kepler-1806 b Planet Profile

Physical Specs

Radius

2.36 R⊕

Radius (Jupiter)

0.210 R♃

Mass

6.15 M⊕

Mass (Jupiter)

0.019 M♃

Density

2.59 g/cm³

Surface Gravity

1.11 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.356

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

#1411of 1978

top 71.3%

This planet

2.36R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-10 c 2.36 R⊕ Kepler-68 b 2.36 R⊕ Kepler-1842 b 2.35 R⊕

Metric	Earth	Kepler-1806 b	Jupiter
Radius (R⊕)	1.00	2.36	11.21
Mass (M⊕)	1.00	6.15	317.83
Density (g/cm³)	5.51	2.59	1.33
Surface Gravity (g)	1.00	1.11	2.53
Insolation (S⊕)	1.00	66.89	0.037

Star Catalogue Identifiers

TIC

TIC 399954605

Gaia DR2

Gaia DR2 2132842177507335424

Gaia DR3

Gaia DR3 2132842177507335424

System

Kepler-1806

Percentile among Sub-Neptune cohort

Radius 2.356 R⊕ · percentile 29 / cohort 1978

Mass 6.150 M⊕ · percentile 28 / cohort 1978

Orbital period 9.03 d · percentile 30 / cohort 1946

Distance 978.07 pc · percentile 77 / cohort 1975

ESI 0.356 · percentile 42 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.033 days

Semi-major axis

0.0813 AU

Eccentricity

0.000

Inclination

88.82 °

Year Length

A year here lasts approximately 9.03 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0813 AU.

Transit Fingerprint

Depth

0.061 %

Duration

2.857 h

Impact parameter b

0.420

Rp / R★

0.022819

Transit midpoint (BJD)

2,454,970.1703

Photometric dip

Transit produces a flux drop of 611 ppm lasting ≈ 2.86 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022819

Semi-major axis / stellar radius

21.140

Impact parameter (b)

0.420

Transit mid-time (BJD)

2,454,970.1703

Angular separation (arcsec)

0.08310

Eq. Temperature

729K

(456 °C)

Insolation (S⊕)

66.89

Earth = 1.00

Earth Similarity (ESI)

0.356

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

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-1806

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,311 K — cooler than the Sun (5,778 K)

Estimated Age

0.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.788 R☉

Stellar Mass

0.884 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.588 dex

Stellar density

2.515 g/cm³

Metallicity ratio

[Fe/H]

Distance

978.07 parsec

Light-years 3,190.02 ly

V-band magnitude

16.17 mag

Voyager-speed travel 56,256,016 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.994 mas

Total Proper Motion

7.699 mas/yr

PM Right Ascension

-5.05 mas/yr

PM Declination

-5.81 mas/yr

Galactic Cartesian (pc)

x = 0.194 · y = -0.615 · z = 0.764

Equatorial (J2000)

RA 287.53495° · Dec 49.80163°

Galactic ℓ, b

80.503° · 17.546°

Ecliptic λ, β

306.702° · 71.014°

HTM-20 index

829114376