Key parameters at a glance
- A radius of 2.08 Earth radii
- A mass of 4.98 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 8.104 days
- Semi-major axis 0.0710 AU
- Equilibrium temperature 687 K (414 °C)
- Distance from Earth 2,145.53 light-years
- Earth Similarity Index 0.395
- Travel time at Voyager 1 speed 37,836,348 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-237
Kepler-237 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-237 b | Super-Earth | 1.41 | 2.57 | 4.715 | 823 | 2014 |
| Kepler-237 c this | Sub-Neptune | 2.08 | 4.98 | 8.104 | 687 | 2014 |
Kepler-237 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1846of 1978
top 93.3%
This planet
2.08R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-237 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.08 | 11.21 |
| Mass (M⊕) | 1.00 | 4.98 | 317.83 |
| Density (g/cm³) | 5.51 | 3.04 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 60.64 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 258348597
Gaia DR2
Gaia DR2 2103573865170471680
Gaia DR3
Gaia DR3 2103573865170471680
System
Kepler-237
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.10 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0710 AU.
Transit Fingerprint
Depth
0.089 %
Duration
3.150 h
Impact parameter b
0.140
Rp / R★
0.028456
Transit midpoint (BJD)
2,455,009.9481
Photometric dip
Transit produces a flux drop of 888 ppm lasting ≈ 3.15 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028456
Semi-major axis / stellar radius
20.090
Impact parameter (b)
0.140
Transit mid-time (BJD)
2,455,009.9481
Angular separation (arcsec)
0.10800
Eq. Temperature
687K
(414 °C)
Insolation (S⊕)
60.64
Earth = 1.00
Earth Similarity (ESI)
0.395
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-237
Spectral Class
K-type orange
Effective Temperature
4,861 K — cooler than the Sun (5,778 K)
Estimated Age
3.02 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.725 R☉
Stellar Mass
0.696 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.583 dex
Stellar density
1.840 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
1.492 mas
Total Proper Motion
14.109 mas/yr
PM Right Ascension
-8.50 mas/yr
PM Declination
-11.26 mas/yr
Galactic Cartesian (pc)
x = 0.174 · y = -0.741 · z = 0.648
Equatorial (J2000)
RA 283.22134° · Dec 40.42176°
Galactic ℓ, b
70.200° · 16.941°
Ecliptic λ, β
292.416° · 62.836°
HTM-20 index
-184367019
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