Key parameters at a glance
- A radius of 3.12 Earth radii
- A mass of 9.91 Earth masses
- Surface gravity around 1.02 g
- An orbital period of 1.260 days
- Semi-major axis 0.0223 AU
- Equilibrium temperature 1,569 K (1296 °C)
- Distance from Earth 2,903.94 light-years
- Earth Similarity Index 0.137
- Travel time at Voyager 1 speed 51,210,917 years
1 sibling around Kepler-656
Kepler-656 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-656 b this | Sub-Neptune | 3.12 | 9.91 | 1.260 | 1,569 | 2016 |
| Kepler-656 c | Super-Earth | 1.41 | 2.57 | 5.254 | 975 | 2023 |
Kepler-656 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#418of 1978
top 21.1%
This planet
3.12R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-656 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.12 | 11.21 |
| Mass (M⊕) | 1.00 | 9.91 | 317.83 |
| Density (g/cm³) | 5.51 | 1.79 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.02 | 2.53 |
| Insolation (S⊕) | 1.00 | 924.37 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158731243
Gaia DR2
Gaia DR2 2130825020347168512
Gaia DR3
Gaia DR3 2130825020347168512
System
Kepler-656
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.26 Earth days (0.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0223 AU.
Transit Fingerprint
Depth
0.113 %
Duration
1.874 h
Impact parameter b
0.791
Rp / R★
0.035311
Transit midpoint (BJD)
2,455,003.4089
Photometric dip
Transit produces a flux drop of 1,131 ppm lasting ≈ 1.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.035311
Semi-major axis / stellar radius
5.400
Impact parameter (b)
0.791
Transit mid-time (BJD)
2,455,003.4089
Angular separation (arcsec)
0.02510
Eq. Temperature
1,569K
(1296 °C)
Insolation (S⊕)
924.37
Earth = 1.00
Earth Similarity (ESI)
0.137
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-656
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,281 K — cooler than the Sun (5,778 K)
Estimated Age
4.37 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.820 R☉
Stellar Mass
0.860 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.560 dex
Stellar density
1.490 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.095 mas
Total Proper Motion
4.673 mas/yr
PM Right Ascension
-2.28 mas/yr
PM Declination
-4.08 mas/yr
Galactic Cartesian (pc)
x = 0.213 · y = -0.643 · z = 0.736
Equatorial (J2000)
RA 288.32788° · Dec 47.38154°
Galactic ℓ, b
78.367° · 16.148°
Ecliptic λ, β
305.632° · 68.565°
HTM-20 index
-1870625089
Similar Worlds
Kepler-150 e
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.12 R⊕ · 2,906.4 ly
Kepler-11 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.12 R⊕ · 2,108.1 ly
HD 93963 A c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.12 R⊕ · 268.6 ly
Kepler-1791 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.12 R⊕ · 1,964.2 ly
Kepler-1820 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.12 R⊕ · 4,649.0 ly
Kepler-1721 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.12 R⊕ · 2,091.9 ly