Key parameters at a glance
- A radius of 1.73 Earth radii
- A mass of 3,305.02 Earth masses
- Surface gravity around 1,104.29 g
- An orbital period of 2.091 days
- Semi-major axis 0.0340 AU
- Equilibrium temperature 1,642 K (1369 °C)
- Distance from Earth 5,866.73 light-years
- Earth Similarity Index 0.036
- Travel time at Voyager 1 speed 103,459,796 years
4 siblings around Kepler-238
Kepler-238 b shares its host star with 4 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-238 b this | Super-Earth | 1.73 | 3,305.02 | 2.091 | 1,642 | 2014 |
| Kepler-238 c | Sub-Neptune | 2.39 | 152.52 | 6.156 | 1,146 | 2014 |
| Kepler-238 d | Sub-Neptune | 3.07 | 23.10 | 13.234 | 888 | 2014 |
| Kepler-238 e | Neptune-like | 5.60 | 169.70 | 23.654 | 731 | 2013 |
| Kepler-238 f | Sub-Neptune | 2.00 | 13.50 | 50.447 | 568 | 2013 |
Kepler-238 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#356of 1176
top 30.2%
This planet
1.73R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-238 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.73 | 11.21 |
| Mass (M⊕) | 1.00 | 3,305.02 | 317.83 |
| Density (g/cm³) | 5.51 | 526.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 1,104.29 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,500.59 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3,305.020 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 121460918
Gaia DR2
Gaia DR2 2100624562669914240
Gaia DR3
Gaia DR3 2100624562669914240
System
Kepler-238
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.09 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0340 AU.
Transit Fingerprint
Depth
0.012 %
Duration
3.193 h
Impact parameter b
0.780
Rp / R★
0.009990
Transit midpoint (BJD)
2,454,967.1647
Photometric dip
Transit produces a flux drop of 116 ppm lasting ≈ 3.19 h.
Extended Orbital Architecture
Planet / star radius ratio
0.009990
Semi-major axis / stellar radius
2.765
Impact parameter (b)
0.780
Transit mid-time (BJD)
2,454,967.1647
Angular separation (arcsec)
0.01890
Eq. Temperature
1,642K
(1369 °C)
Insolation (S⊕)
2,500.59
Earth = 1.00
Earth Similarity (ESI)
0.036
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-238
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,751 K — cooler than the Sun (5,778 K)
Estimated Age
4.79 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.430 R☉
Stellar Mass
1.229 M☉
Metallicity [Fe/H]
0.34
Extended Stellar Properties
Surface gravity (log g)
4.194 dex
Stellar density
0.419 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.527 mas
Total Proper Motion
0.843 mas/yr
PM Right Ascension
-0.17 mas/yr
PM Declination
-0.83 mas/yr
Galactic Cartesian (pc)
x = 0.233 · y = -0.722 · z = 0.651
Equatorial (J2000)
RA 287.89711° · Dec 40.63781°
Galactic ℓ, b
71.835° · 13.749°
Ecliptic λ, β
300.023° · 62.224°
HTM-20 index
-1303763685
Similar Worlds
Kepler-1126 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.73 R⊕ · 2,073.5 ly
Kepler-166 d
Super-Earth · G-type yellow (Sun-like)
Radius 1.73 R⊕ · 1,968.4 ly
Kepler-1522 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.73 R⊕ · 2,655.3 ly
Kepler-1468 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.73 R⊕ · 6,194.5 ly
Kepler-1153 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.73 R⊕ · 3,651.3 ly
Kepler-1478 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.73 R⊕ · 6,019.5 ly