Key parameters at a glance
- A radius of 1.55 Earth radii
- A mass of 24.00 Earth masses
- Surface gravity around 9.99 g
- An orbital period of 3.941 days
- Semi-major axis 0.0470 AU
- Equilibrium temperature 1,018 K (745 °C)
- Distance from Earth 3,196.78 light-years
- Earth Similarity Index 0.185
- Travel time at Voyager 1 speed 56,375,193 years
2 siblings around Kepler-226
Kepler-226 b 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-226 b this | Super-Earth | 1.55 | 24.00 | 3.941 | 1,018 | 2014 |
| Kepler-226 c | Sub-Neptune | 2.27 | 45.20 | 5.350 | 919 | 2014 |
| Kepler-226 d | Rocky Terrestrial | 1.22 | 1.98 | 8.109 | 800 | 2014 |
Kepler-226 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#652of 1176
top 55.4%
This planet
1.55R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-226 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.55 | 11.21 |
| Mass (M⊕) | 1.00 | 24.00 | 317.83 |
| Density (g/cm³) | 5.51 | 35.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 9.99 | 2.53 |
| Insolation (S⊕) | 1.00 | 270.40 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 24.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 63204017
Gaia DR2
Gaia DR2 2128504397979254528
Gaia DR3
Gaia DR3 2128504397979254528
System
Kepler-226
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.94 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0470 AU.
Transit Fingerprint
Depth
0.036 %
Duration
2.596 h
Impact parameter b
0.150
Rp / R★
0.018026
Transit midpoint (BJD)
2,454,969.0934
Photometric dip
Transit produces a flux drop of 363 ppm lasting ≈ 2.60 h.
Extended Orbital Architecture
Planet / star radius ratio
0.018026
Semi-major axis / stellar radius
12.060
Impact parameter (b)
0.150
Transit mid-time (BJD)
2,454,969.0934
Angular separation (arcsec)
0.04800
Eq. Temperature
1,018K
(745 °C)
Insolation (S⊕)
270.40
Earth = 1.00
Earth Similarity (ESI)
0.185
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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-226
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,571 K — cooler than the Sun (5,778 K)
Estimated Age
4.17 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.802 R☉
Stellar Mass
0.904 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.586 dex
Stellar density
1.430 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.992 mas
Total Proper Motion
10.217 mas/yr
PM Right Ascension
-6.26 mas/yr
PM Declination
-8.07 mas/yr
Galactic Cartesian (pc)
x = 0.255 · y = -0.620 · z = 0.742
Equatorial (J2000)
RA 292.37609° · Dec 47.88096°
Galactic ℓ, b
79.988° · 13.859°
Ecliptic λ, β
312.980° · 68.008°
HTM-20 index
-603487203
Similar Worlds
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Kepler-784 c
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Kepler-195 c
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Kepler-1282 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.55 R⊕ · 3,598.4 ly