Key parameters at a glance
- A radius of 2.72 Earth radii
- A mass of 7.85 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 142.544 days
- Semi-major axis 0.5177 AU
- Equilibrium temperature 318 K (45 °C)
- Distance from Earth 3,535.24 light-years
- Earth Similarity Index 0.693
- Travel time at Voyager 1 speed 62,343,910 years
2 siblings around Kepler-351
Kepler-351 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-351 b | Sub-Neptune | 3.06 | 4.80 | 37.055 | 498 | 2014 |
| Kepler-351 c | Sub-Neptune | 3.19 | 11.10 | 57.248 | 431 | 2014 |
| Kepler-351 d this | Sub-Neptune | 2.72 | 7.85 | 142.544 | 318 | 2016 |
Kepler-351 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#838of 1978
top 42.3%
This planet
2.72R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-351 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.72 | 11.21 |
| Mass (M⊕) | 1.00 | 7.85 | 317.83 |
| Density (g/cm³) | 5.51 | 2.14 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.99 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158218178
Gaia DR2
Gaia DR2 2105491997566014336
Gaia DR3
Gaia DR3 2105491997566014336
System
Kepler-351
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 142.54 Earth days (39.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5177 AU.
Transit Fingerprint
Depth
0.091 %
Duration
8.949 h
Impact parameter b
0.015
Rp / R★
0.032068
Transit midpoint (BJD)
2,455,035.8852
Photometric dip
Transit produces a flux drop of 905 ppm lasting ≈ 8.95 h.
Extended Orbital Architecture
Planet / star radius ratio
0.032068
Semi-major axis / stellar radius
127.830
Impact parameter (b)
0.015
Transit mid-time (BJD)
2,455,035.8852
Angular separation (arcsec)
0.47800
Eq. Temperature
318K
(45 °C)
Insolation (S⊕)
1.99
Earth = 1.00
Earth Similarity (ESI)
0.693
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
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-351
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,225 K — cooler than the Sun (5,778 K)
Estimated Age
4.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.780 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
-0.16
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
2.348 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.895 mas
Total Proper Motion
19.873 mas/yr
PM Right Ascension
8.41 mas/yr
PM Declination
-18.01 mas/yr
Galactic Cartesian (pc)
x = 0.208 · y = -0.705 · z = 0.678
Equatorial (J2000)
RA 286.45279° · Dec 42.65779°
Galactic ℓ, b
73.306° · 15.543°
Ecliptic λ, β
298.880° · 64.456°
HTM-20 index
1304842111
Similar Worlds
K2-331 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.72 R⊕ · 689.6 ly
Kepler-358 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.72 R⊕ · 3,591.3 ly
Kepler-979 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.72 R⊕ · 1,880.3 ly
Kepler-1748 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 3,533.2 ly
EPIC 220674823 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 797.7 ly
K2-380 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.73 R⊕ · 813.1 ly