Key parameters at a glance

A radius of 1.23 Earth radii
A mass of 5.30 Earth masses
Surface gravity around 3.50 g
An orbital period of 10.350 days
Semi-major axis 0.0900 AU
Equilibrium temperature 930 K (657 °C)
Distance from Earth 1,078.19 light-years
Earth Similarity Index 0.270
Travel time at Voyager 1 speed 19,013,883 years

3 siblings around Kepler-197

Kepler-197 c 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 this	Rocky Terrestrial	1.23	5.30	10.350	930	2014
Kepler-197 d	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 c Planet Profile

Physical Specs

Radius

1.23 R⊕

Radius (Jupiter)

0.110 R♃

Mass

5.30 M⊕

Mass (Jupiter)

0.017 M♃

Density

15.70 g/cm³

Surface Gravity

3.50 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.270

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

#17of 570

top 2.8%

This planet

1.23R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-252 b 1.23 R⊕ Kepler-54 c 1.23 R⊕ Kepler-271 b 1.23 R⊕

Metric	Earth	Kepler-197 c	Jupiter
Radius (R⊕)	1.00	1.23	11.21
Mass (M⊕)	1.00	5.30	317.83
Density (g/cm³)	5.51	15.70	1.33
Surface Gravity (g)	1.00	3.50	2.53
Insolation (S⊕)	1.00	189.97	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	5.300 M⊕	Direct mass measurement (not derived).

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 1.230 R⊕ · percentile 94 / cohort 570

Mass 5.300 M⊕ · percentile 95 / cohort 570

Orbital period 10.35 d · percentile 79 / cohort 567

Distance 330.58 pc · percentile 44 / cohort 566

ESI 0.270 · percentile 29 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

10.350 days

Semi-major axis

0.0900 AU

Eccentricity

0.080

Inclination

83.51 °

Year Length

A year here lasts approximately 10.35 Earth days (2.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0900 AU.

Transit Fingerprint

Depth

0.013 %

Duration

4.251 h

Impact parameter b

0.220

Rp / R★

0.010940

Transit midpoint (BJD)

2,455,007.0642

Photometric dip

Transit produces a flux drop of 125 ppm lasting ≈ 4.25 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010940

Semi-major axis / stellar radius

9.430

Impact parameter (b)

0.220

Transit mid-time (BJD)

2,455,007.0642

Angular separation (arcsec)

0.27200

Eq. Temperature

930K

(657 °C)

Insolation (S⊕)

189.97

Earth = 1.00

Earth Similarity (ESI)

0.270

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