Key parameters at a glance
- A radius of 2.35 Earth radii
- A mass of 6.12 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 10.682 days
- Semi-major axis 0.0960 AU
- Equilibrium temperature 897 K (624 °C)
- Distance from Earth 3,347.76 light-years
- Earth Similarity Index 0.288
- Travel time at Voyager 1 speed 59,037,798 years
3 siblings around Kepler-256
Kepler-256 e shares its host star with 3 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-256 b | Super-Earth | 1.59 | 3.15 | 1.620 | 1,681 | 2014 |
| Kepler-256 c | Sub-Neptune | 2.15 | 5.27 | 3.388 | 1,315 | 2014 |
| Kepler-256 d | Sub-Neptune | 2.48 | 6.71 | 5.839 | 1,097 | 2014 |
| Kepler-256 e this | Sub-Neptune | 2.35 | 6.12 | 10.682 | 897 | 2014 |
Kepler-256 e Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1416of 1978
top 71.5%
This planet
2.35R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-256 e | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.35 | 11.21 |
| Mass (M⊕) | 1.00 | 6.12 | 317.83 |
| Density (g/cm³) | 5.51 | 2.59 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 98.90 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 63362772
Gaia DR2
Gaia DR2 2128250926189039488
Gaia DR3
Gaia DR3 2128250926189039488
System
Kepler-256
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.68 Earth days (2.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0960 AU.
Transit Fingerprint
Depth
0.031 %
Duration
3.542 h
Impact parameter b
0.040
Rp / R★
0.017112
Transit midpoint (BJD)
2,454,964.5549
Photometric dip
Transit produces a flux drop of 308 ppm lasting ≈ 3.54 h.
Extended Orbital Architecture
Planet / star radius ratio
0.017112
Semi-major axis / stellar radius
22.460
Impact parameter (b)
0.040
Transit mid-time (BJD)
2,454,964.5549
Angular separation (arcsec)
0.09350
Eq. Temperature
897K
(624 °C)
Insolation (S⊕)
98.90
Earth = 1.00
Earth Similarity (ESI)
0.288
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-256
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,551 K — cooler than the Sun (5,778 K)
Estimated Age
1.82 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.301 R☉
Stellar Mass
1.037 M☉
Metallicity [Fe/H]
0.26
Extended Stellar Properties
Surface gravity (log g)
4.223 dex
Stellar density
1.150 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.946 mas
Total Proper Motion
2.633 mas/yr
PM Right Ascension
-0.18 mas/yr
PM Declination
-2.63 mas/yr
Galactic Cartesian (pc)
x = 0.266 · y = -0.640 · z = 0.721
Equatorial (J2000)
RA 292.58042° · Dec 46.09736°
Galactic ℓ, b
78.396° · 12.964°
Ecliptic λ, β
311.508° · 66.313°
HTM-20 index
-835019452
Similar Worlds
HD 158259 f
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.35 R⊕ · 88.2 ly
Kepler-1132 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.35 R⊕ · 2,830.8 ly
TOI-2141 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.35 R⊕ · 253.4 ly
Kepler-172 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.35 R⊕ · 2,702.5 ly
Kepler-292 f
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.35 R⊕ · 3,445.8 ly
Kepler-416 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.35 R⊕ · 2,253.1 ly