Key parameters at a glance
- A radius of 4.71 Earth radii
- A mass of 19.90 Earth masses
- Surface gravity around 0.90 g
- An orbital period of 4.663 days
- Semi-major axis 0.0560 AU
- Equilibrium temperature 1,039 K (766 °C)
- Distance from Earth 1,595.36 light-years
- Earth Similarity Index 0.184
- Travel time at Voyager 1 speed 28,134,220 years
1 sibling around Kepler-318
Kepler-318 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-318 b this | Neptune-like | 4.71 | 19.90 | 4.663 | 1,039 | 2014 |
| Kepler-318 c | Sub-Neptune | 3.68 | 13.10 | 11.815 | 762 | 2014 |
Kepler-318 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#429of 574
top 74.6%
This planet
4.71R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-318 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.71 | 11.21 |
| Mass (M⊕) | 1.00 | 19.90 | 317.83 |
| Density (g/cm³) | 5.51 | 1.05 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.90 | 2.53 |
| Insolation (S⊕) | 1.00 | 333.15 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 274198407
Gaia DR2
Gaia DR2 2085559604106082688
Gaia DR3
Gaia DR3 2085559604106082688
System
Kepler-318
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.66 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0560 AU.
Transit Fingerprint
Depth
0.162 %
Duration
2.746 h
Impact parameter b
0.070
Rp / R★
0.036670
Transit midpoint (BJD)
2,454,967.0818
Photometric dip
Transit produces a flux drop of 1,619 ppm lasting ≈ 2.75 h.
Extended Orbital Architecture
Planet / star radius ratio
0.036670
Semi-major axis / stellar radius
13.444
Impact parameter (b)
0.070
Transit mid-time (BJD)
2,454,967.0818
Angular separation (arcsec)
0.11400
Eq. Temperature
1,039K
(766 °C)
Insolation (S⊕)
333.15
Earth = 1.00
Earth Similarity (ESI)
0.184
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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-318
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,746 K — cooler than the Sun (5,778 K)
Estimated Age
0.95 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.189 R☉
Stellar Mass
1.073 M☉
Metallicity [Fe/H]
0.33
Extended Stellar Properties
Surface gravity (log g)
4.325 dex
Stellar density
1.120 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.016 mas
Total Proper Motion
3.462 mas/yr
PM Right Ascension
1.84 mas/yr
PM Declination
2.93 mas/yr
Galactic Cartesian (pc)
x = 0.326 · y = -0.602 · z = 0.729
Equatorial (J2000)
RA 298.48283° · Dec 46.79364°
Galactic ℓ, b
80.952° · 9.687°
Ecliptic λ, β
321.233° · 65.246°
HTM-20 index
42241302
Similar Worlds
HD 213885 c
Neptune-like · G-type yellow (Sun-like)
Radius 4.71 R⊕ · 156.8 ly
Kepler-20 g
Neptune-like · G-type yellow (Sun-like)
Radius 4.71 R⊕ · 921.6 ly
HD 107148 c
Neptune-like · G-type yellow (Sun-like)
Radius 4.70 R⊕ · 161.2 ly
LTT 9779 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.72 R⊕ · 262.4 ly
TCP J05074264+2447555 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.72 R⊕ · 1,647.1 ly
Kepler-667 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.73 R⊕ · 7,509.6 ly