Key parameters at a glance
- A radius of 2.24 Earth radii
- A mass of 5.65 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 13.541 days
- Semi-major axis 0.1100 AU
- Equilibrium temperature 779 K (506 °C)
- Distance from Earth 2,523.51 light-years
- Earth Similarity Index 0.339
- Travel time at Voyager 1 speed 44,502,121 years
2 siblings around Kepler-157
Kepler-157 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-157 b | Super-Earth | 1.32 | 2.30 | 1.732 | 1,546 | 2014 |
| Kepler-157 d | Super-Earth | 1.46 | 2.73 | 7.026 | 969 | 2016 |
| Kepler-157 c this | Sub-Neptune | 2.24 | 5.65 | 13.541 | 779 | 2014 |
Kepler-157 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1607of 1978
top 81.2%
This planet
2.24R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-157 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.24 | 11.21 |
| Mass (M⊕) | 1.00 | 5.65 | 317.83 |
| Density (g/cm³) | 5.51 | 2.76 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 101.75 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122716806
Gaia DR2
Gaia DR2 2052941389074846336
Gaia DR3
Gaia DR3 2052941389074846336
System
Kepler-157
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.54 Earth days (3.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1100 AU.
Transit Fingerprint
Depth
0.046 %
Duration
4.514 h
Impact parameter b
0.340
Rp / R★
0.019300
Transit midpoint (BJD)
2,455,004.6803
Photometric dip
Transit produces a flux drop of 461 ppm lasting ≈ 4.51 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019300
Semi-major axis / stellar radius
23.240
Impact parameter (b)
0.340
Transit mid-time (BJD)
2,455,004.6803
Angular separation (arcsec)
0.14200
Eq. Temperature
779K
(506 °C)
Insolation (S⊕)
101.75
Earth = 1.00
Earth Similarity (ESI)
0.339
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-157
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,774 K — cooler than the Sun (5,778 K)
Estimated Age
7.59 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.044 R☉
Stellar Mass
0.950 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.389 dex
Stellar density
0.800 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
1.264 mas
Total Proper Motion
4.931 mas/yr
PM Right Ascension
4.39 mas/yr
PM Declination
2.24 mas/yr
Galactic Cartesian (pc)
x = 0.280 · y = -0.726 · z = 0.628
Equatorial (J2000)
RA 291.09723° · Dec 38.87560°
Galactic ℓ, b
71.276° · 10.773°
Ecliptic λ, β
303.914° · 59.855°
HTM-20 index
1926531787
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Kepler-534 b
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