Key parameters at a glance
- A radius of 3.06 Earth radii
- A mass of 4.80 Earth masses
- Surface gravity around 0.51 g
- An orbital period of 37.055 days
- Semi-major axis 0.2140 AU
- Equilibrium temperature 498 K (225 °C)
- Distance from Earth 3,535.24 light-years
- Earth Similarity Index 0.411
- Travel time at Voyager 1 speed 62,343,910 years
2 siblings around Kepler-351
Kepler-351 b 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 this | 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 | Sub-Neptune | 2.72 | 7.85 | 142.544 | 318 | 2016 |
Kepler-351 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#466of 1978
top 23.5%
This planet
3.06R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-351 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.06 | 11.21 |
| Mass (M⊕) | 1.00 | 4.80 | 317.83 |
| Density (g/cm³) | 5.51 | 0.92 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.51 | 2.53 |
| Insolation (S⊕) | 1.00 | 11.98 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.800 M⊕ | Direct mass measurement (not derived). |
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 37.05 Earth days (10.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2140 AU.
Transit Fingerprint
Depth
0.108 %
Duration
5.122 h
Impact parameter b
0.860
Rp / R★
0.029799
Transit midpoint (BJD)
2,455,033.2003
Photometric dip
Transit produces a flux drop of 1,079 ppm lasting ≈ 5.12 h.
Extended Orbital Architecture
Planet / star radius ratio
0.029799
Semi-major axis / stellar radius
59.710
Impact parameter (b)
0.860
Transit mid-time (BJD)
2,455,033.2003
Angular separation (arcsec)
0.19700
Eq. Temperature
498K
(225 °C)
Insolation (S⊕)
11.98
Earth = 1.00
Earth Similarity (ESI)
0.411
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-351
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,643 K — cooler than the Sun (5,778 K)
Estimated Age
2.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.854 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
-0.16
Extended Stellar Properties
Surface gravity (log g)
4.556 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
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HD 63935 c
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Kepler-238 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.07 R⊕ · 5,866.7 ly