Key parameters at a glance
- A radius of 2.51 Earth radii
- A mass of 6.85 Earth masses
- Surface gravity around 1.09 g
- An orbital period of 56.228 days
- Semi-major axis 0.2680 AU
- Equilibrium temperature 366 K (93 °C)
- Distance from Earth 2,113.85 light-years
- Earth Similarity Index 0.643
- Travel time at Voyager 1 speed 37,277,679 years
1 sibling around Kepler-239
Kepler-239 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-239 b | Sub-Neptune | 2.33 | 6.04 | 11.763 | 616 | 2014 |
| Kepler-239 c this | Sub-Neptune | 2.51 | 6.85 | 56.228 | 366 | 2014 |
Kepler-239 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1159of 1978
top 58.5%
This planet
2.51R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-239 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.51 | 11.21 |
| Mass (M⊕) | 1.00 | 6.85 | 317.83 |
| Density (g/cm³) | 5.51 | 2.38 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.09 | 2.53 |
| Insolation (S⊕) | 1.00 | 4.32 | 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 56.23 Earth days (15.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2680 AU.
Transit Fingerprint
Depth
0.086 %
Duration
3.700 h
Impact parameter b
0.860
Rp / R★
0.027316
Transit midpoint (BJD)
2,454,965.2881
Photometric dip
Transit produces a flux drop of 863 ppm lasting ≈ 3.70 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027316
Semi-major axis / stellar radius
129.920
Impact parameter (b)
0.860
Transit mid-time (BJD)
2,454,965.2881
Angular separation (arcsec)
0.41400
Eq. Temperature
366K
(93 °C)
Insolation (S⊕)
4.32
Earth = 1.00
Earth Similarity (ESI)
0.643
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
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
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Sub-Neptune · K-type orange
Radius 2.51 R⊕ · 622.3 ly
Kepler-1521 b
Sub-Neptune · K-type orange
Radius 2.50 R⊕ · 675.1 ly
TOI-757 b
Sub-Neptune · K-type orange
Radius 2.50 R⊕ · 196.8 ly
Kepler-391 b
Sub-Neptune · K-type orange
Radius 2.50 R⊕ · 2,835.1 ly
Kepler-1350 b
Sub-Neptune · K-type orange
Radius 2.52 R⊕ · 1,111.2 ly
Kepler-298 d
Sub-Neptune · K-type orange
Radius 2.50 R⊕ · 1,690.2 ly