Key parameters at a glance
- A radius of 0.91 Earth radii
- A mass of 0.69 Earth masses
- Surface gravity around 0.84 g
- An orbital period of 25.210 days
- Semi-major axis 0.1640 AU
- Equilibrium temperature 691 K (418 °C)
- Distance from Earth 1,078.19 light-years
- Earth Similarity Index 0.463
- Travel time at Voyager 1 speed 19,013,883 years
3 siblings around Kepler-197
Kepler-197 e 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 | Rocky Terrestrial | 1.22 | 1.98 | 15.678 | 810 | 2014 |
| Kepler-197 e this | Rocky Terrestrial | 0.91 | 0.69 | 25.210 | 691 | 2014 |
Kepler-197 e Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#406of 570
top 71.1%
This planet
0.91R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-197 e | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 0.91 | 11.21 |
| Mass (M⊕) | 1.00 | 0.69 | 317.83 |
| Density (g/cm³) | 5.51 | 5.05 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.84 | 2.53 |
| Insolation (S⊕) | 1.00 | 57.94 | 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
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 25.21 Earth days (6.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1640 AU.
Transit Fingerprint
Depth
0.006 %
Duration
6.298 h
Impact parameter b
0.140
Rp / R★
0.008740
Transit midpoint (BJD)
2,454,987.4134
Photometric dip
Transit produces a flux drop of 62 ppm lasting ≈ 6.30 h.
Extended Orbital Architecture
Planet / star radius ratio
0.008740
Semi-major axis / stellar radius
17.070
Impact parameter (b)
0.140
Transit mid-time (BJD)
2,454,987.4134
Angular separation (arcsec)
0.49600
Eq. Temperature
691K
(418 °C)
Insolation (S⊕)
57.94
Earth = 1.00
Earth Similarity (ESI)
0.463
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. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
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]
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
Similar Worlds
Kepler-1607 b
Rocky Terrestrial · F-type yellow-white
Radius 0.92 R⊕ · 4,194.7 ly
Kepler-1547 b
Rocky Terrestrial · F-type yellow-white
Radius 0.90 R⊕ · 2,200.6 ly
Kepler-1398 b
Rocky Terrestrial · F-type yellow-white
Radius 0.90 R⊕ · 2,779.5 ly
Kepler-1352 b
Rocky Terrestrial · F-type yellow-white
Radius 0.89 R⊕ · 2,187.9 ly
Kepler-1408 b
Rocky Terrestrial · F-type yellow-white
Radius 0.89 R⊕ · 1,745.1 ly
Kepler-1421 b
Rocky Terrestrial · F-type yellow-white
Radius 0.93 R⊕ · 2,555.1 ly