Key parameters at a glance

A radius of 1.01 Earth radii
A mass of 1.01 Earth masses
Surface gravity around 0.99 g
An orbital period of 6.964 days
Semi-major axis 0.0738 AU
Equilibrium temperature 1,298 K (1025 °C)
Distance from Earth 1,528.92 light-years
Earth Similarity Index 0.242
Travel time at Voyager 1 speed 26,962,586 years

Kepler-1947 b Planet Profile

Physical Specs

Radius

1.01 R⊕

Radius (Jupiter)

0.090 R♃

Mass

1.01 M⊕

Mass (Jupiter)

0.003 M♃

Density

5.38 g/cm³

Surface Gravity

0.99 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.242

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

#325of 570

top 56.8%

This planet

1.01R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1278 b 1.01 R⊕ Kepler-282 b 1.01 R⊕ Kepler-398 c 1.01 R⊕

Metric	Earth	Kepler-1947 b	Jupiter
Radius (R⊕)	1.00	1.01	11.21
Mass (M⊕)	1.00	1.01	317.83
Density (g/cm³)	5.51	5.38	1.33
Surface Gravity (g)	1.00	0.99	2.53
Insolation (S⊕)	1.00	229.40	0.037

Star Catalogue Identifiers

TIC

TIC 272180236

Gaia DR2

Gaia DR2 2077219499172974848

Gaia DR3

Gaia DR3 2077219499172974848

System

Kepler-1947

Percentile among Rocky Terrestrial cohort

Radius 1.010 R⊕ · percentile 43 / cohort 570

Mass 1.010 M⊕ · percentile 37 / cohort 570

Orbital period 6.96 d · percentile 67 / cohort 567

Distance 468.77 pc · percentile 60 / cohort 566

ESI 0.242 · percentile 24 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

6.964 days

Semi-major axis

0.0738 AU

Eccentricity

0.000

Inclination

89.69 °

Year Length

A year here lasts approximately 6.96 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0737 AU.

Transit Fingerprint

Depth

0.007 %

Duration

3.176 h

Impact parameter b

0.050

Rp / R★

0.007832

Transit midpoint (BJD)

2,454,966.0142

Photometric dip

Transit produces a flux drop of 68 ppm lasting ≈ 3.18 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007832

Semi-major axis / stellar radius

16.730

Impact parameter (b)

0.050

Transit mid-time (BJD)

2,454,966.0142

Angular separation (arcsec)

0.15700

Eq. Temperature

1,298K

(1025 °C)

Insolation (S⊕)

229.40

Earth = 1.00

Earth Similarity (ESI)

0.242

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-1947

Spectral Class

F-type yellow-white

Effective Temperature

6,040 K — hotter than the Sun (5,778 K)

Estimated Age

0.98 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.686 R☉

Stellar Mass

0.984 M☉

Metallicity [Fe/H]

-0.44

Extended Stellar Properties

Surface gravity (log g)

3.978 dex

Stellar density

1.828 g/cm³

Metallicity ratio

[Fe/H]

Distance

468.77 parsec

Light-years 1,528.92 ly

V-band magnitude

12.97 mag

Voyager-speed travel 26,962,586 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Parallax

2.105 mas

Total Proper Motion

4.651 mas/yr

PM Right Ascension

-2.80 mas/yr

PM Declination

-3.71 mas/yr

Galactic Cartesian (pc)

x = 0.325 · y = -0.664 · z = 0.674

Equatorial (J2000)

RA 296.10403° · Dec 42.34258°

Galactic ℓ, b

76.176° · 8.999°

Ecliptic λ, β

313.636° · 61.885°

HTM-20 index

1352841815