Key parameters at a glance
- A radius of 2.55 Earth radii
- A mass of 7.04 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 15.907 days
- Semi-major axis 0.1170 AU
- Equilibrium temperature 588 K (315 °C)
- Distance from Earth 1,446.45 light-years
- Earth Similarity Index 0.425
- Travel time at Voyager 1 speed 25,508,081 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-156
Kepler-156 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-156 b | Sub-Neptune | 2.30 | 5.90 | 4.973 | 867 | 2014 |
| Kepler-156 c this | Sub-Neptune | 2.55 | 7.04 | 15.907 | 588 | 2014 |
Kepler-156 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1105of 1978
top 55.8%
This planet
2.55R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-156 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.55 | 11.21 |
| Mass (M⊕) | 1.00 | 7.04 | 317.83 |
| Density (g/cm³) | 5.51 | 2.33 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 28.64 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122374620
Gaia DR2
Gaia DR2 2051105410816218368
Gaia DR3
Gaia DR3 2051105410816218368
System
Kepler-156
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 15.91 Earth days (4.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1170 AU.
Transit Fingerprint
Depth
0.092 %
Duration
3.984 h
Impact parameter b
0.640
Rp / R★
0.027043
Transit midpoint (BJD)
2,455,010.9332
Photometric dip
Transit produces a flux drop of 925 ppm lasting ≈ 3.98 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027043
Semi-major axis / stellar radius
31.300
Impact parameter (b)
0.640
Transit mid-time (BJD)
2,455,010.9332
Angular separation (arcsec)
0.26400
Eq. Temperature
588K
(315 °C)
Insolation (S⊕)
28.64
Earth = 1.00
Earth Similarity (ESI)
0.425
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-156
Spectral Class
K-type orange
Effective Temperature
5,094 K — cooler than the Sun (5,778 K)
Estimated Age
3.39 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.807 R☉
Stellar Mass
0.864 M☉
Metallicity [Fe/H]
0.25
Extended Stellar Properties
Surface gravity (log g)
4.552 dex
Stellar density
1.680 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
2.226 mas
Total Proper Motion
21.607 mas/yr
PM Right Ascension
-14.83 mas/yr
PM Declination
-15.71 mas/yr
Galactic Cartesian (pc)
x = 0.274 · y = -0.742 · z = 0.612
Equatorial (J2000)
RA 290.29642° · Dec 37.74943°
Galactic ℓ, b
69.965° · 10.840°
Ecliptic λ, β
302.117° · 58.946°
HTM-20 index
1837686316
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K2-16 c
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