Key parameters at a glance
- A radius of 2.09 Earth radii
- A mass of 109.80 Earth masses
- Surface gravity around 25.14 g
- An orbital period of 5.524 days
- Semi-major axis 0.0610 AU
- Equilibrium temperature 976 K (703 °C)
- Distance from Earth 3,067.77 light-years
- Earth Similarity Index 0.149
- Travel time at Voyager 1 speed 54,100,141 years
1 sibling around Kepler-317
Kepler-317 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-317 b this | Sub-Neptune | 2.09 | 109.80 | 5.524 | 976 | 2014 |
| Kepler-317 c | Super-Earth | 1.72 | 3.61 | 8.775 | 837 | 2014 |
Kepler-317 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1832of 1978
top 92.6%
This planet
2.09R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-317 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.09 | 11.21 |
| Mass (M⊕) | 1.00 | 109.80 | 317.83 |
| Density (g/cm³) | 5.51 | 66.10 | 1.33 |
| Surface Gravity (g) | 1.00 | 25.14 | 2.53 |
| Insolation (S⊕) | 1.00 | 151.65 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 109.800 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 138890353
Gaia DR2
Gaia DR2 2052163518963966336
Gaia DR3
Gaia DR3 2052163518963966336
System
Kepler-317
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.52 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0610 AU.
Transit Fingerprint
Depth
0.049 %
Duration
2.672 h
Impact parameter b
0.300
Rp / R★
0.020679
Transit midpoint (BJD)
2,454,968.6193
Photometric dip
Transit produces a flux drop of 491 ppm lasting ≈ 2.67 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020679
Semi-major axis / stellar radius
15.160
Impact parameter (b)
0.300
Transit mid-time (BJD)
2,454,968.6193
Angular separation (arcsec)
0.06490
Eq. Temperature
976K
(703 °C)
Insolation (S⊕)
151.65
Earth = 1.00
Earth Similarity (ESI)
0.149
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-317
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,497 K — cooler than the Sun (5,778 K)
Estimated Age
3.72 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.941 R☉
Stellar Mass
0.865 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
4.493 dex
Stellar density
1.481 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.035 mas
Total Proper Motion
2.294 mas/yr
PM Right Ascension
0.51 mas/yr
PM Declination
-2.24 mas/yr
Galactic Cartesian (pc)
x = 0.328 · y = -0.704 · z = 0.630
Equatorial (J2000)
RA 294.94388° · Dec 39.03205°
Galactic ℓ, b
72.811° · 8.188°
Ecliptic λ, β
309.616° · 59.088°
HTM-20 index
-1991753327
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