Key parameters at a glance
- A radius of 1.41 Earth radii
- A mass of 2.57 Earth masses
- Surface gravity around 1.29 g
- An orbital period of 5.254 days
- Semi-major axis 0.0602 AU
- Equilibrium temperature 975 K (702 °C)
- Distance from Earth 2,903.94 light-years
- Earth Similarity Index 0.313
- Travel time at Voyager 1 speed 51,210,917 years
1 sibling around Kepler-656
Kepler-656 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-656 b | Sub-Neptune | 3.12 | 9.91 | 1.260 | 1,569 | 2016 |
| Kepler-656 c this | Super-Earth | 1.41 | 2.57 | 5.254 | 975 | 2023 |
Kepler-656 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#902of 1176
top 76.6%
This planet
1.41R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-656 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.41 | 11.21 |
| Mass (M⊕) | 1.00 | 2.57 | 317.83 |
| Density (g/cm³) | 5.51 | 5.04 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.29 | 2.53 |
| Insolation (S⊕) | 1.00 | 213.25 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158731243
Gaia DR2
Gaia DR2 2130825020347168512
Gaia DR3
Gaia DR3 2130825020347168512
System
Kepler-656
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.25 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0602 AU.
Transit Fingerprint
Depth
0.017 %
Duration
3.078 h
Impact parameter b
0.837
Rp / R★
0.013572
Transit midpoint (BJD)
2,454,965.5562
Photometric dip
Transit produces a flux drop of 169 ppm lasting ≈ 3.08 h.
Extended Orbital Architecture
Planet / star radius ratio
0.013572
Semi-major axis / stellar radius
7.520
Impact parameter (b)
0.837
Transit mid-time (BJD)
2,454,965.5562
Angular separation (arcsec)
0.06760
Eq. Temperature
975K
(702 °C)
Insolation (S⊕)
213.25
Earth = 1.00
Earth Similarity (ESI)
0.313
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
Valizadegan et al. 2023Instrument
Kepler CCD Array
Publication
2023-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Kepler (12 shown).
Host System: Kepler-656
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,550 K — cooler than the Sun (5,778 K)
Estimated Age
2.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.954 R☉
Stellar Mass
1.050 M☉
Metallicity [Fe/H]
0.46
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
0.291 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
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Super-Earth · G-type yellow (Sun-like)
Radius 1.41 R⊕ · 2,278.2 ly
Kepler-537 b
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Radius 1.41 R⊕ · 1,433.1 ly
Kepler-1493 b
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Radius 1.41 R⊕ · 1,810.3 ly
Kepler-1471 b
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Kepler-334 d
Super-Earth · G-type yellow (Sun-like)
Radius 1.41 R⊕ · 1,391.3 ly
Kepler-905 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.41 R⊕ · 1,726.2 ly