Key parameters at a glance
- A radius of 2.33 Earth radii
- A mass of 6.04 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 16.797 days
- Semi-major axis 0.1145 AU
- Equilibrium temperature 503 K (230 °C)
- Distance from Earth 1,920.63 light-years
- Earth Similarity Index 0.507
- Travel time at Voyager 1 speed 33,870,221 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-436
Kepler-436 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-436 c this | Sub-Neptune | 2.33 | 6.04 | 16.797 | 503 | 2016 |
| Kepler-436 b | Sub-Neptune | 2.73 | 7.90 | 64.002 | 322 | 2015 |
Kepler-436 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1451of 1978
top 73.3%
This planet
2.33R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-436 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.33 | 11.21 |
| Mass (M⊕) | 1.00 | 6.04 | 317.83 |
| Density (g/cm³) | 5.51 | 2.62 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 14.52 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 185408817
Gaia DR2
Gaia DR2 2081897989863673216
Gaia DR3
Gaia DR3 2081897989863673216
System
Kepler-436
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 16.80 Earth days (4.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1145 AU.
Transit Fingerprint
Depth
0.102 %
Duration
3.238 h
Impact parameter b
0.049
Rp / R★
0.030499
Transit midpoint (BJD)
2,454,967.0422
Photometric dip
Transit produces a flux drop of 1,024 ppm lasting ≈ 3.24 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030499
Semi-major axis / stellar radius
40.790
Impact parameter (b)
0.049
Transit mid-time (BJD)
2,454,967.0422
Angular separation (arcsec)
0.19400
Eq. Temperature
503K
(230 °C)
Insolation (S⊕)
14.52
Earth = 1.00
Earth Similarity (ESI)
0.507
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-436
Spectral Class
K-type orange
Effective Temperature
4,685 K — cooler than the Sun (5,778 K)
Estimated Age
4.07 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.710 R☉
Stellar Mass
0.750 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.620 dex
Stellar density
2.340 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.671 mas
Total Proper Motion
5.588 mas/yr
PM Right Ascension
5.36 mas/yr
PM Declination
1.57 mas/yr
Galactic Cartesian (pc)
x = 0.376 · y = -0.608 · z = 0.700
Equatorial (J2000)
RA 301.72078° · Dec 44.41209°
Galactic ℓ, b
80.059° · 6.522°
Ecliptic λ, β
323.378° · 62.100°
HTM-20 index
-611529180
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Kepler-1802 c
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