Key parameters at a glance
- A radius of 2.30 Earth radii
- A mass of 5.90 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 4.973 days
- Semi-major axis 0.0540 AU
- Equilibrium temperature 867 K (594 °C)
- Distance from Earth 1,446.45 light-years
- Earth Similarity Index 0.300
- 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 b 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 this | Sub-Neptune | 2.30 | 5.90 | 4.973 | 867 | 2014 |
| Kepler-156 c | Sub-Neptune | 2.55 | 7.04 | 15.907 | 588 | 2014 |
Kepler-156 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1499of 1978
top 75.7%
This planet
2.30R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-156 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.30 | 11.21 |
| Mass (M⊕) | 1.00 | 5.90 | 317.83 |
| Density (g/cm³) | 5.51 | 2.66 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 135.08 | 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 4.97 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0540 AU.
Transit Fingerprint
Depth
0.074 %
Duration
1.579 h
Impact parameter b
0.690
Rp / R★
0.028304
Transit midpoint (BJD)
2,455,003.8853
Photometric dip
Transit produces a flux drop of 742 ppm lasting ≈ 1.58 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028304
Semi-major axis / stellar radius
12.890
Impact parameter (b)
0.690
Transit mid-time (BJD)
2,455,003.8853
Angular separation (arcsec)
0.12200
Eq. Temperature
867K
(594 °C)
Insolation (S⊕)
135.08
Earth = 1.00
Earth Similarity (ESI)
0.300
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
Similar Worlds
K2-59 c
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 1,015.4 ly
Kepler-224 d
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 2,550.8 ly
Kepler-621 b
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 1,268.7 ly
TOI-2093 c
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 270.1 ly
TOI-178 e
Sub-Neptune · K-type orange
Radius 2.30 R⊕ · 204.5 ly
K2-57 b
Sub-Neptune · K-type orange
Radius 2.31 R⊕ · 861.7 ly