Key parameters at a glance

A radius of 2.75 Earth radii
A mass of 7.97 Earth masses
Surface gravity around 1.06 g
An orbital period of 11.130 days
Semi-major axis 0.0989 AU
Equilibrium temperature 843 K (570 °C)
Distance from Earth 5,524.63 light-years
Earth Similarity Index 0.289
Travel time at Voyager 1 speed 97,426,774 years

Kepler-1847 b Planet Profile

Physical Specs

Radius

2.75 R⊕

Radius (Jupiter)

0.245 R♃

Mass

7.97 M⊕

Mass (Jupiter)

0.025 M♃

Density

2.12 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.289

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

#813of 1978

top 41.1%

This planet

2.75R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-1824 b 2.74 R⊕ Kepler-25 b 2.75 R⊕ Kepler-1815 b 2.75 R⊕

Metric	Earth	Kepler-1847 b	Jupiter
Radius (R⊕)	1.00	2.75	11.21
Mass (M⊕)	1.00	7.97	317.83
Density (g/cm³)	5.51	2.12	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	119.44	0.037

Star Catalogue Identifiers

TIC

TIC 272490211

Gaia DR2

Gaia DR2 2079680137473255808

Gaia DR3

Gaia DR3 2079680137473255808

System

Kepler-1847

Percentile among Sub-Neptune cohort

Radius 2.745 R⊕ · percentile 59 / cohort 1978

Mass 7.970 M⊕ · percentile 54 / cohort 1978

Orbital period 11.13 d · percentile 39 / cohort 1946

Distance 1,693.86 pc · percentile 95 / cohort 1975

ESI 0.289 · percentile 25 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

11.130 days

Semi-major axis

0.0989 AU

Eccentricity

0.000

Inclination

88.66 °

Year Length

A year here lasts approximately 11.13 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0989 AU.

Transit Fingerprint

Depth

0.037 %

Duration

2.771 h

Impact parameter b

0.530

Rp / R★

0.018314

Transit midpoint (BJD)

2,454,971.5739

Photometric dip

Transit produces a flux drop of 371 ppm lasting ≈ 2.77 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018314

Semi-major axis / stellar radius

24.370

Impact parameter (b)

0.530

Transit mid-time (BJD)

2,454,971.5739

Angular separation (arcsec)

0.05840

Eq. Temperature

843K

(570 °C)

Insolation (S⊕)

119.44

Earth = 1.00

Earth Similarity (ESI)

0.289

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-1847

Spectral Class

F-type yellow-white

Effective Temperature

6,122 K — hotter than the Sun (5,778 K)

Estimated Age

0.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.964 R☉

Stellar Mass

1.041 M☉

Metallicity [Fe/H]

-0.18

Extended Stellar Properties

Surface gravity (log g)

4.487 dex

Stellar density

2.210 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,693.86 parsec

Light-years 5,524.63 ly

V-band magnitude

16.03 mag

Voyager-speed travel 97,426,774 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.564 mas

Total Proper Motion

7.722 mas/yr

PM Right Ascension

-1.99 mas/yr

PM Declination

-7.46 mas/yr

Galactic Cartesian (pc)

x = 0.320 · y = -0.640 · z = 0.699

Equatorial (J2000)

RA 296.60140° · Dec 44.32523°

Galactic ℓ, b

78.115° · 9.635°

Ecliptic λ, β

316.034° · 63.574°

HTM-20 index

-1997314517