Key parameters at a glance

A radius of 1.22 Earth radii
A mass of 1.98 Earth masses
Surface gravity around 1.33 g
An orbital period of 15.678 days
Semi-major axis 0.1190 AU
Equilibrium temperature 810 K (537 °C)
Distance from Earth 1,078.19 light-years
Earth Similarity Index 0.387
Travel time at Voyager 1 speed 19,013,883 years

3 siblings around Kepler-197

Kepler-197 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-197 b	Rocky Terrestrial	1.02	1.04	5.599	1,142	2014
Kepler-197 c	Rocky Terrestrial	1.23	5.30	10.350	930	2014
Kepler-197 d this	Rocky Terrestrial	1.22	1.98	15.678	810	2014
Kepler-197 e	Rocky Terrestrial	0.91	0.69	25.210	691	2014

Kepler-197 d Planet Profile

Physical Specs

Radius

1.22 R⊕

Radius (Jupiter)

0.109 R♃

Mass

1.98 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.99 g/cm³

Surface Gravity

1.33 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.387

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#35of 570

top 6.0%

This planet

1.22R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-295 b 1.22 R⊕ Kepler-1834 c 1.22 R⊕ Kepler-226 d 1.22 R⊕

Metric	Earth	Kepler-197 d	Jupiter
Radius (R⊕)	1.00	1.22	11.21
Mass (M⊕)	1.00	1.98	317.83
Density (g/cm³)	5.51	5.99	1.33
Surface Gravity (g)	1.00	1.33	2.53
Insolation (S⊕)	1.00	109.09	0.037

Star Catalogue Identifiers

TIC

TIC 27397848

Gaia DR2

Gaia DR2 2135179533070399232

Gaia DR3

Gaia DR3 2135179533070399232

System

Kepler-197

Percentile among Rocky Terrestrial cohort

Radius 1.220 R⊕ · percentile 92 / cohort 570

Mass 1.980 M⊕ · percentile 83 / cohort 570

Orbital period 15.68 d · percentile 89 / cohort 567

Distance 330.58 pc · percentile 44 / cohort 566

ESI 0.387 · percentile 56 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

15.678 days

Semi-major axis

0.1190 AU

Eccentricity

0.030

Inclination

84.55 °

Year Length

A year here lasts approximately 15.68 Earth days (4.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1190 AU.

Transit Fingerprint

Depth

0.010 %

Duration

5.326 h

Impact parameter b

0.660

Rp / R★

0.010640

Transit midpoint (BJD)

2,455,012.4689

Photometric dip

Transit produces a flux drop of 104 ppm lasting ≈ 5.33 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010640

Semi-major axis / stellar radius

12.430

Impact parameter (b)

0.660

Transit mid-time (BJD)

2,455,012.4689

Angular separation (arcsec)

0.36000

Eq. Temperature

810K

(537 °C)

Insolation (S⊕)

109.09

Earth = 1.00

Earth Similarity (ESI)

0.387

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

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-197

Spectral Class

F-type yellow-white

Effective Temperature

6,004 K — hotter than the Sun (5,778 K)

Estimated Age

5.37 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.120 R☉

Stellar Mass

0.857 M☉

Metallicity [Fe/H]

-0.44

Extended Stellar Properties

Surface gravity (log g)

4.304 dex

Stellar density

0.550 g/cm³

Systemic radial velocity

1.23 km/s

Metallicity ratio

[M/H]

Distance

330.58 parsec

Light-years 1,078.19 ly

V-band magnitude

11.78 mag

Voyager-speed travel 19,013,883 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.996 mas

Total Proper Motion

53.803 mas/yr

PM Right Ascension

8.44 mas/yr

PM Declination

53.14 mas/yr

Galactic Cartesian (pc)

x = 0.271 · y = -0.575 · z = 0.772

Equatorial (J2000)

RA 295.22647° · Dec 50.55923°

Galactic ℓ, b

83.304° · 13.359°

Ecliptic λ, β

320.891° · 69.579°

HTM-20 index

-336933782