Key parameters at a glance
- A radius of 3.12 Earth radii
- A mass of 9.91 Earth masses
- Surface gravity around 1.02 g
- An orbital period of 5.925 days
- Semi-major axis 0.0580 AU
- Equilibrium temperature 758 K (485 °C)
- Distance from Earth 2,550.83 light-years
- Earth Similarity Index 0.306
- Travel time at Voyager 1 speed 44,983,831 years
- Almost certainly tidally locked to its host star given the close orbit
3 siblings around Kepler-224
Kepler-224 c 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-224 b | Super-Earth | 1.39 | 2.51 | 3.133 | 937 | 2014 |
| Kepler-224 c this | Sub-Neptune | 3.12 | 9.91 | 5.925 | 758 | 2014 |
| Kepler-224 d | Sub-Neptune | 2.30 | 5.90 | 11.349 | 610 | 2014 |
| Kepler-224 e | Super-Earth | 1.97 | 4.54 | 18.644 | 517 | 2014 |
Kepler-224 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#418of 1978
top 21.1%
This planet
3.12R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-224 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.12 | 11.21 |
| Mass (M⊕) | 1.00 | 9.91 | 317.83 |
| Density (g/cm³) | 5.51 | 1.79 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.02 | 2.53 |
| Insolation (S⊕) | 1.00 | 86.33 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159642189
Gaia DR2
Gaia DR2 2129161734133025408
Gaia DR3
Gaia DR3 2129161734133025408
System
Kepler-224
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.93 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0580 AU.
Transit Fingerprint
Depth
0.174 %
Duration
2.843 h
Impact parameter b
0.850
Rp / R★
0.036000
Transit midpoint (BJD)
2,455,002.7151
Photometric dip
Transit produces a flux drop of 1,736 ppm lasting ≈ 2.84 h.
Extended Orbital Architecture
Planet / star radius ratio
0.036000
Semi-major axis / stellar radius
9.550
Impact parameter (b)
0.850
Transit mid-time (BJD)
2,455,002.7151
Angular separation (arcsec)
0.07420
Eq. Temperature
758K
(485 °C)
Insolation (S⊕)
86.33
Earth = 1.00
Earth Similarity (ESI)
0.306
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
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-224
Spectral Class
K-type orange
Effective Temperature
5,018 K — cooler than the Sun (5,778 K)
Estimated Age
2.29 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.676 R☉
Stellar Mass
0.777 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.639 dex
Stellar density
2.060 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.250 mas
Total Proper Motion
9.934 mas/yr
PM Right Ascension
-0.95 mas/yr
PM Declination
-9.89 mas/yr
Galactic Cartesian (pc)
x = 0.242 · y = -0.633 · z = 0.736
Equatorial (J2000)
RA 290.93427° · Dec 47.35754°
Galactic ℓ, b
79.077° · 14.521°
Ecliptic λ, β
310.051° · 67.906°
HTM-20 index
-163657889
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HD 13808 c
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Kepler-1318 b
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Kepler-57 b
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TOI-1410.01
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Kepler-1536 b
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Radius 3.14 R⊕ · 1,263.0 ly