Key parameters at a glance
- A radius of 1.86 Earth radii
- A mass of 4.12 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 17.739 days
- Semi-major axis 0.1280 AU
- Equilibrium temperature 596 K (323 °C)
- Distance from Earth 1,938.88 light-years
- Earth Similarity Index 0.471
- Travel time at Voyager 1 speed 34,192,147 years
2 siblings around Kepler-191
Kepler-191 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-191 d | Sub-Neptune | 2.28 | 5.82 | 5.945 | 857 | 2016 |
| Kepler-191 b | Super-Earth | 1.34 | 2.36 | 9.940 | 722 | 2014 |
| Kepler-191 c this | Super-Earth | 1.86 | 4.12 | 17.739 | 596 | 2014 |
Kepler-191 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#177of 1176
top 15.0%
This planet
1.86R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-191 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.86 | 11.21 |
| Mass (M⊕) | 1.00 | 4.12 | 317.83 |
| Density (g/cm³) | 5.51 | 3.52 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | 23.20 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159647213
Gaia DR2
Gaia DR2 2126648731589350272
Gaia DR3
Gaia DR3 2126648731589350272
System
Kepler-191
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.74 Earth days (4.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1280 AU.
Transit Fingerprint
Depth
0.061 %
Duration
2.821 h
Impact parameter b
0.140
Rp / R★
0.025400
Transit midpoint (BJD)
2,454,981.9886
Photometric dip
Transit produces a flux drop of 606 ppm lasting ≈ 2.82 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025400
Semi-major axis / stellar radius
29.000
Impact parameter (b)
0.140
Transit mid-time (BJD)
2,454,981.9886
Angular separation (arcsec)
0.21500
Eq. Temperature
596K
(323 °C)
Insolation (S⊕)
23.20
Earth = 1.00
Earth Similarity (ESI)
0.471
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-191
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,282 K — cooler than the Sun (5,778 K)
Estimated Age
1.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.789 R☉
Stellar Mass
0.857 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
4.594 dex
Stellar density
1.820 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.654 mas
Total Proper Motion
17.649 mas/yr
PM Right Ascension
-5.50 mas/yr
PM Declination
-16.77 mas/yr
Galactic Cartesian (pc)
x = 0.254 · y = -0.656 · z = 0.711
Equatorial (J2000)
RA 291.18332° · Dec 45.32309°
Galactic ℓ, b
77.247° · 13.512°
Ecliptic λ, β
308.563° · 65.950°
HTM-20 index
1586289339
Similar Worlds
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Super-Earth · G-type yellow (Sun-like)
Radius 1.86 R⊕ · 3,431.9 ly
Kepler-1488 b
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Kepler-265 b
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K2-168 b
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Kepler-1463 b
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Kepler-1827 b
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Radius 1.86 R⊕ · 2,238.9 ly