Key parameters at a glance
- A radius of 2.00 Earth radii
- A mass of 4.66 Earth masses
- Surface gravity around 1.17 g
- An orbital period of 23.968 days
- Semi-major axis 0.1320 AU
- Equilibrium temperature 329 K (56 °C)
- Distance from Earth 941.82 light-years
- Earth Similarity Index 0.758
- Travel time at Voyager 1 speed 16,608,957 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-236
Kepler-236 c 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-236 b | Super-Earth | 1.57 | 3.09 | 8.296 | 469 | 2014 |
| Kepler-236 c this | Sub-Neptune | 2.00 | 4.66 | 23.968 | 329 | 2014 |
Kepler-236 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1955of 1978
top 98.8%
This planet
2.00R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-236 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.00 | 11.21 |
| Mass (M⊕) | 1.00 | 4.66 | 317.83 |
| Density (g/cm³) | 5.51 | 3.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.17 | 2.53 |
| Insolation (S⊕) | 1.00 | 3.80 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 120044687
Gaia DR2
Gaia DR2 2103311150611475968
Gaia DR3
Gaia DR3 2103311150611475968
System
Kepler-236
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 23.97 Earth days (6.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1320 AU.
Transit Fingerprint
Depth
0.118 %
Duration
4.166 h
Impact parameter b
0.840
Rp / R★
0.033284
Transit midpoint (BJD)
2,455,019.2169
Photometric dip
Transit produces a flux drop of 1,182 ppm lasting ≈ 4.17 h.
Extended Orbital Architecture
Planet / star radius ratio
0.033284
Semi-major axis / stellar radius
45.000
Impact parameter (b)
0.840
Transit mid-time (BJD)
2,455,019.2169
Angular separation (arcsec)
0.45700
Eq. Temperature
329K
(56 °C)
Insolation (S⊕)
3.80
Earth = 1.00
Earth Similarity (ESI)
0.758
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.
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-236
Spectral Class
M-type red dwarf
Effective Temperature
3,750 K — cooler than the Sun (5,778 K)
Estimated Age
0.91 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.510 R☉
Stellar Mass
0.596 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.753 dex
Stellar density
3.706 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.434 mas
Total Proper Motion
23.516 mas/yr
PM Right Ascension
9.25 mas/yr
PM Declination
21.62 mas/yr
Galactic Cartesian (pc)
x = 0.184 · y = -0.745 · z = 0.641
Equatorial (J2000)
RA 283.86643° · Dec 39.89819°
Galactic ℓ, b
69.883° · 16.289°
Ecliptic λ, β
293.233° · 62.223°
HTM-20 index
-165574757
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