Key parameters at a glance

A radius of 2.78 Earth radii
A mass of 8.13 Earth masses
Surface gravity around 1.05 g
An orbital period of 7.363 days
Semi-major axis 0.0738 AU
Equilibrium temperature 901 K (628 °C)
Distance from Earth 4,437.78 light-years
Earth Similarity Index 0.269
Travel time at Voyager 1 speed 78,260,182 years

Kepler-1906 b Planet Profile

Physical Specs

Radius

2.78 R⊕

Radius (Jupiter)

0.248 R♃

Mass

8.13 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.09 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.269

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

#778of 1978

top 39.3%

This planet

2.78R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-487 d 2.78 R⊕ Kepler-1840 b 2.78 R⊕ Kepler-58 b 2.78 R⊕

Metric	Earth	Kepler-1906 b	Jupiter
Radius (R⊕)	1.00	2.78	11.21
Mass (M⊕)	1.00	8.13	317.83
Density (g/cm³)	5.51	2.09	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	155.72	0.037

Star Catalogue Identifiers

TIC

TIC 138366224

Gaia DR2

Gaia DR2 2052379641715057408

Gaia DR3

Gaia DR3 2052379641715057408

System

Kepler-1906

Percentile among Sub-Neptune cohort

Radius 2.776 R⊕ · percentile 61 / cohort 1978

Mass 8.130 M⊕ · percentile 56 / cohort 1978

Orbital period 7.36 d · percentile 24 / cohort 1946

Distance 1,360.63 pc · percentile 90 / cohort 1975

ESI 0.269 · percentile 21 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

7.363 days

Semi-major axis

0.0738 AU

Eccentricity

0.000

Inclination

89.65 °

Year Length

A year here lasts approximately 7.36 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0738 AU.

Transit Fingerprint

Depth

0.043 %

Duration

1.329 h

Impact parameter b

0.050

Rp / R★

0.019093

Transit midpoint (BJD)

2,454,969.8614

Photometric dip

Transit produces a flux drop of 429 ppm lasting ≈ 1.33 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019093

Semi-major axis / stellar radius

41.720

Impact parameter (b)

0.050

Transit mid-time (BJD)

2,454,969.8614

Angular separation (arcsec)

0.05420

Eq. Temperature

901K

(628 °C)

Insolation (S⊕)

155.72

Earth = 1.00

Earth Similarity (ESI)

0.269

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-1906

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

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

Estimated Age

0.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.894 R☉

Stellar Mass

0.987 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

4.530 dex

Stellar density

25.488 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,360.63 parsec

Light-years 4,437.78 ly

V-band magnitude

15.32 mag

Voyager-speed travel 78,260,182 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.707 mas

Total Proper Motion

3.541 mas/yr

PM Right Ascension

-0.67 mas/yr

PM Declination

-3.48 mas/yr

Galactic Cartesian (pc)

x = 0.315 · y = -0.712 · z = 0.627

Equatorial (J2000)

RA 293.82662° · Dec 38.85659°

Galactic ℓ, b

72.240° · 8.872°

Ecliptic λ, β

307.902° · 59.200°

HTM-20 index

1326203772