Key parameters at a glance

A radius of 1.18 Earth radii
A mass of 1.76 Earth masses
Surface gravity around 1.26 g
An orbital period of 2.343 days
Semi-major axis 0.0315 AU
Equilibrium temperature 1,054 K (781 °C)
Distance from Earth 1,673.52 light-years
Earth Similarity Index 0.295
Travel time at Voyager 1 speed 29,512,457 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-847 b Planet Profile

Physical Specs

Radius

1.18 R⊕

Radius (Jupiter)

0.105 R♃

Mass

1.76 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.89 g/cm³

Surface Gravity

1.26 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.295

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#117of 570

top 20.4%

This planet

1.18R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1430 b 1.18 R⊕ Kepler-1512 b 1.18 R⊕ Kepler-332 d 1.18 R⊕

Metric	Earth	Kepler-847 b	Jupiter
Radius (R⊕)	1.00	1.18	11.21
Mass (M⊕)	1.00	1.76	317.83
Density (g/cm³)	5.51	5.89	1.33
Surface Gravity (g)	1.00	1.26	2.53
Insolation (S⊕)	1.00	292.31	0.037

Star Catalogue Identifiers

TIC

TIC 48352404

Gaia DR2

Gaia DR2 2131884640317332608

Gaia DR3

Gaia DR3 2131884640317332608

System

Kepler-847

Percentile among Rocky Terrestrial cohort

Radius 1.180 R⊕ · percentile 77 / cohort 570

Mass 1.760 M⊕ · percentile 71 / cohort 570

Orbital period 2.34 d · percentile 26 / cohort 567

Distance 513.10 pc · percentile 65 / cohort 566

ESI 0.295 · percentile 37 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.343 days

Semi-major axis

0.0315 AU

Eccentricity

0.000

Inclination

89.70 °

Year Length

A year here lasts approximately 2.34 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0315 AU.

Transit Fingerprint

Depth

0.025 %

Duration

2.039 h

Impact parameter b

0.047

Rp / R★

0.014397

Transit midpoint (BJD)

2,454,966.2066

Photometric dip

Transit produces a flux drop of 247 ppm lasting ≈ 2.04 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014397

Semi-major axis / stellar radius

8.893

Impact parameter (b)

0.047

Transit mid-time (BJD)

2,454,966.2066

Angular separation (arcsec)

0.06140

Eq. Temperature

1,054K

(781 °C)

Insolation (S⊕)

292.31

Earth = 1.00

Earth Similarity (ESI)

0.295

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-847

Spectral Class

K-type orange

Effective Temperature

4,940 K — cooler than the Sun (5,778 K)

Estimated Age

3.89 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.770 R☉

Stellar Mass

0.830 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.580 dex

Stellar density

2.426 g/cm³

Metallicity ratio

[Fe/H]

Distance

513.10 parsec

Light-years 1,673.52 ly

V-band magnitude

15.00 mag

Voyager-speed travel 29,512,457 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.920 mas

Total Proper Motion

13.571 mas/yr

PM Right Ascension

-1.64 mas/yr

PM Declination

-13.47 mas/yr

Galactic Cartesian (pc)

x = 0.152 · y = -0.632 · z = 0.760

Equatorial (J2000)

RA 283.50481° · Dec 49.45094°

Galactic ℓ, b

79.205° · 19.875°

Ecliptic λ, β

298.660° · 71.549°

HTM-20 index

1871202234