Key parameters at a glance
- A radius of 2.05 Earth radii
- A mass of 19.80 Earth masses
- Surface gravity around 4.71 g
- An orbital period of 11.579 days
- Semi-major axis 0.1060 AU
- Equilibrium temperature 951 K (678 °C)
- Distance from Earth 1,372.52 light-years
- Earth Similarity Index 0.250
- Travel time at Voyager 1 speed 24,204,445 years
1 sibling around Kepler-136
Kepler-136 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-136 b this | Sub-Neptune | 2.05 | 19.80 | 11.579 | 951 | 2014 |
| Kepler-136 c | Super-Earth | 1.99 | 4.62 | 16.399 | 847 | 2014 |
Kepler-136 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1888of 1978
top 95.4%
This planet
2.05R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-136 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.05 | 11.21 |
| Mass (M⊕) | 1.00 | 19.80 | 317.83 |
| Density (g/cm³) | 5.51 | 12.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 4.71 | 2.53 |
| Insolation (S⊕) | 1.00 | 257.98 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 19.800 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 272375343
Gaia DR2
Gaia DR2 2077203178296653056
Gaia DR3
Gaia DR3 2077203178296653056
System
Kepler-136
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.58 Earth days (3.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1060 AU.
Transit Fingerprint
Depth
0.024 %
Duration
2.855 h
Impact parameter b
0.390
Rp / R★
0.014458
Transit midpoint (BJD)
2,455,008.5865
Photometric dip
Transit produces a flux drop of 242 ppm lasting ≈ 2.86 h.
Extended Orbital Architecture
Planet / star radius ratio
0.014458
Semi-major axis / stellar radius
22.500
Impact parameter (b)
0.390
Transit mid-time (BJD)
2,455,008.5865
Angular separation (arcsec)
0.25200
Eq. Temperature
951K
(678 °C)
Insolation (S⊕)
257.98
Earth = 1.00
Earth Similarity (ESI)
0.250
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-136
Spectral Class
F-type yellow-white
Effective Temperature
6,165 K — hotter than the Sun (5,778 K)
Estimated Age
2.75 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.355 R☉
Stellar Mass
1.204 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.244 dex
Stellar density
0.506 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
2.348 mas
Total Proper Motion
3.448 mas/yr
PM Right Ascension
-2.09 mas/yr
PM Declination
2.74 mas/yr
Galactic Cartesian (pc)
x = 0.328 · y = -0.659 · z = 0.677
Equatorial (J2000)
RA 296.46730° · Dec 42.59880°
Galactic ℓ, b
76.534° · 8.888°
Ecliptic λ, β
314.368° · 62.022°
HTM-20 index
1396327261
Similar Worlds
K2-46 b
Sub-Neptune · F-type yellow-white
Radius 2.05 R⊕ · 1,465.2 ly
Kepler-1705 c
Sub-Neptune · F-type yellow-white
Radius 2.05 R⊕ · 5,327.7 ly
TOI-1670 b
Sub-Neptune · F-type yellow-white
Radius 2.06 R⊕ · 548.2 ly
Kepler-365 b
Sub-Neptune · F-type yellow-white
Radius 2.04 R⊕ · 3,388.7 ly
K2-373 b
Sub-Neptune · F-type yellow-white
Radius 2.06 R⊕ · 748.7 ly
Kepler-1396 b
Sub-Neptune · F-type yellow-white
Radius 2.07 R⊕ · 3,478.3 ly