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 11.763 days
- Semi-major axis 0.0950 AU
- Equilibrium temperature 616 K (343 °C)
- Distance from Earth 2,113.85 light-years
- Earth Similarity Index 0.421
- Travel time at Voyager 1 speed 37,277,679 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-239
Kepler-239 b 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-239 b this | Sub-Neptune | 2.33 | 6.04 | 11.763 | 616 | 2014 |
| Kepler-239 c | Sub-Neptune | 2.51 | 6.85 | 56.228 | 366 | 2014 |
Kepler-239 b 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-239 b | 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 | 34.75 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 138641300
Gaia DR2
Gaia DR2 2077298148611950976
Gaia DR3
Gaia DR3 2077298148611950976
System
Kepler-239
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.76 Earth days (3.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0950 AU.
Transit Fingerprint
Depth
0.104 %
Duration
2.899 h
Impact parameter b
0.170
Rp / R★
0.028519
Transit midpoint (BJD)
2,455,013.9361
Photometric dip
Transit produces a flux drop of 1,037 ppm lasting ≈ 2.90 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028519
Semi-major axis / stellar radius
31.870
Impact parameter (b)
0.170
Transit mid-time (BJD)
2,455,013.9361
Angular separation (arcsec)
0.14700
Eq. Temperature
616K
(343 °C)
Insolation (S⊕)
34.75
Earth = 1.00
Earth Similarity (ESI)
0.421
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-239
Spectral Class
K-type orange
Effective Temperature
4,914 K — cooler than the Sun (5,778 K)
Estimated Age
3.31 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.763 R☉
Stellar Mass
0.757 M☉
Metallicity [Fe/H]
0.17
Extended Stellar Properties
Surface gravity (log g)
4.583 dex
Stellar density
1.830 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.515 mas
Total Proper Motion
21.459 mas/yr
PM Right Ascension
-11.55 mas/yr
PM Declination
-18.09 mas/yr
Galactic Cartesian (pc)
x = 0.311 · y = -0.692 · z = 0.652
Equatorial (J2000)
RA 294.20205° · Dec 40.66333°
Galactic ℓ, b
73.995° · 9.459°
Ecliptic λ, β
309.619° · 60.816°
HTM-20 index
1513762169
Similar Worlds
Kepler-241 b
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 1,669.9 ly
Kepler-1983 b
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 1,384.3 ly
Kepler-287 b
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 2,726.2 ly
Kepler-443 b
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 2,616.7 ly
Kepler-436 c
Sub-Neptune · K-type orange
Radius 2.33 R⊕ · 1,920.6 ly
Kepler-1802 c
Sub-Neptune · K-type orange
Radius 2.32 R⊕ · 2,076.6 ly