Key parameters at a glance
- A radius of 1.88 Earth radii
- A mass of 4.19 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 18.736 days
- Semi-major axis 0.1300 AU
- Equilibrium temperature 568 K (295 °C)
- Distance from Earth 988.18 light-years
- Earth Similarity Index 0.491
- Travel time at Voyager 1 speed 17,426,627 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-137
Kepler-137 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-137 b | Super-Earth | 1.47 | 2.76 | 8.436 | 742 | 2014 |
| Kepler-137 c this | Super-Earth | 1.88 | 4.19 | 18.736 | 568 | 2014 |
Kepler-137 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#153of 1176
top 12.9%
This planet
1.88R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-137 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.88 | 11.21 |
| Mass (M⊕) | 1.00 | 4.19 | 317.83 |
| Density (g/cm³) | 5.51 | 3.47 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | 29.78 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 123415819
Gaia DR2
Gaia DR2 2104847370214740352
Gaia DR3
Gaia DR3 2104847370214740352
System
Kepler-137
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 18.74 Earth days (5.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1300 AU.
Transit Fingerprint
Depth
0.057 %
Duration
3.005 h
Impact parameter b
0.060
Rp / R★
0.024162
Transit midpoint (BJD)
2,455,010.6339
Photometric dip
Transit produces a flux drop of 567 ppm lasting ≈ 3.01 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024162
Semi-major axis / stellar radius
33.000
Impact parameter (b)
0.060
Transit mid-time (BJD)
2,455,010.6339
Angular separation (arcsec)
0.42900
Eq. Temperature
568K
(295 °C)
Insolation (S⊕)
29.78
Earth = 1.00
Earth Similarity (ESI)
0.491
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-137
Spectral Class
K-type orange
Effective Temperature
5,187 K — cooler than the Sun (5,778 K)
Estimated Age
4.27 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.802 R☉
Stellar Mass
0.850 M☉
Metallicity [Fe/H]
0.05
Extended Stellar Properties
Surface gravity (log g)
4.553 dex
Stellar density
1.380 g/cm³
Systemic radial velocity
-28.10 km/s
Rotational v·sin i
5.40 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.272 mas
Total Proper Motion
27.595 mas/yr
PM Right Ascension
14.33 mas/yr
PM Declination
23.58 mas/yr
Galactic Cartesian (pc)
x = 0.154 · y = -0.715 · z = 0.682
Equatorial (J2000)
RA 282.13559° · Dec 43.03920°
Galactic ℓ, b
72.467° · 18.628°
Ecliptic λ, β
291.799° · 65.563°
HTM-20 index
-553555599
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