Key parameters at a glance

A radius of 3.90 Earth radii
A mass of 14.50 Earth masses
Surface gravity around 0.95 g
An orbital period of 12.023 days
Semi-major axis 0.1016 AU
Equilibrium temperature 776 K (503 °C)
Distance from Earth 5,185.26 light-years
Earth Similarity Index 0.272
Travel time at Voyager 1 speed 91,442,067 years

Kepler-1851 b Planet Profile

Physical Specs

Radius

3.90 R⊕

Radius (Jupiter)

0.348 R♃

Mass

14.50 M⊕

Mass (Jupiter)

0.046 M♃

Density

1.34 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.272

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

#22of 1978

top 1.1%

This planet

3.90R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-31 d 3.90 R⊕ K2-63 c 3.90 R⊕ K2-388 b 3.90 R⊕

Metric	Earth	Kepler-1851 b	Jupiter
Radius (R⊕)	1.00	3.90	11.21
Mass (M⊕)	1.00	14.50	317.83
Density (g/cm³)	5.51	1.34	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	85.78	0.037

Star Catalogue Identifiers

TIC

TIC 352013607

Gaia DR2

Gaia DR2 2106494580370491392

Gaia DR3

Gaia DR3 2106494580370491392

System

Kepler-1851

Percentile among Sub-Neptune cohort

Radius 3.900 R⊕ · percentile 99 / cohort 1978

Mass 14.500 M⊕ · percentile 92 / cohort 1978

Orbital period 12.02 d · percentile 41 / cohort 1946

Distance 1,589.81 pc · percentile 94 / cohort 1975

ESI 0.272 · percentile 21 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

12.023 days

Semi-major axis

0.1016 AU

Eccentricity

0.000

Inclination

87.95 °

Year Length

A year here lasts approximately 12.02 Earth days (3.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1016 AU.

Transit Fingerprint

Depth

0.078 %

Duration

1.267 h

Impact parameter b

1.158

Rp / R★

0.034126

Transit midpoint (BJD)

2,454,969.2069

Photometric dip

Transit produces a flux drop of 779 ppm lasting ≈ 1.27 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034126

Semi-major axis / stellar radius

19.730

Impact parameter (b)

1.158

Transit mid-time (BJD)

2,454,969.2069

Angular separation (arcsec)

0.06390

Eq. Temperature

776K

(503 °C)

Insolation (S⊕)

85.78

Earth = 1.00

Earth Similarity (ESI)

0.272

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-1851

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,982 K — hotter than the Sun (5,778 K)

Estimated Age

0.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.879 R☉

Stellar Mass

0.967 M☉

Metallicity [Fe/H]

-0.28

Extended Stellar Properties

Surface gravity (log g)

4.535 dex

Stellar density

2.579 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,589.81 parsec

Light-years 5,185.26 ly

V-band magnitude

15.70 mag

Voyager-speed travel 91,442,067 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.600 mas

Total Proper Motion

4.153 mas/yr

PM Right Ascension

-0.94 mas/yr

PM Declination

-4.05 mas/yr

Galactic Cartesian (pc)

x = 0.189 · y = -0.673 · z = 0.715

Equatorial (J2000)

RA 285.67376° · Dec 45.63984°

Galactic ℓ, b

75.965° · 17.185°

Ecliptic λ, β

299.543° · 67.478°

HTM-20 index

-1235731782