Key parameters at a glance
- A radius of 2.20 Earth radii
- A mass of 3.64 Earth masses
- Surface gravity around 0.75 g
- An orbital period of 13.073 days
- Semi-major axis 0.1090 AU
- Equilibrium temperature 739 K (466 °C)
- Distance from Earth 1,877.29 light-years
- Earth Similarity Index 0.335
- Travel time at Voyager 1 speed 33,106,042 years
1 sibling around Kepler-307
Kepler-307 c 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-307 b | Sub-Neptune | 2.43 | 7.44 | 10.421 | 797 | 2013 |
| Kepler-307 c this | Sub-Neptune | 2.20 | 3.64 | 13.073 | 739 | 2013 |
Kepler-307 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1673of 1978
top 84.5%
This planet
2.20R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-307 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.20 | 11.21 |
| Mass (M⊕) | 1.00 | 3.64 | 317.83 |
| Density (g/cm³) | 5.51 | 1.74 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.75 | 2.53 |
| Insolation (S⊕) | 1.00 | 44.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3.640 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 169930145
Gaia DR2
Gaia DR2 2073691303802278784
Gaia DR3
Gaia DR3 2073691303802278784
System
Kepler-307
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 13.07 Earth days (3.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1090 AU.
Transit Fingerprint
Depth
0.071 %
Duration
3.040 h
Impact parameter b
0.805
Rp / R★
0.027127
Transit midpoint (BJD)
2,456,465.2666
Photometric dip
Transit produces a flux drop of 706 ppm lasting ≈ 3.04 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027127
Semi-major axis / stellar radius
20.340
Impact parameter (b)
0.805
Transit mid-time (BJD)
2,456,465.2666
Angular separation (arcsec)
0.18900
Eq. Temperature
739K
(466 °C)
Insolation (S⊕)
44.00
Earth = 1.00
Earth Similarity (ESI)
0.335
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Discovery cohort
Planets confirmed in 2013 at Kepler (12 shown).
Host System: Kepler-307
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,367 K — cooler than the Sun (5,778 K)
Estimated Age
0.95 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.814 R☉
Stellar Mass
0.907 M☉
Metallicity [Fe/H]
0.19
Extended Stellar Properties
Surface gravity (log g)
4.460 dex
Stellar density
1.330 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.709 mas
Total Proper Motion
10.785 mas/yr
PM Right Ascension
-1.95 mas/yr
PM Declination
-10.61 mas/yr
Galactic Cartesian (pc)
x = 0.355 · y = -0.673 · z = 0.648
Equatorial (J2000)
RA 297.79509° · Dec 40.41764°
Galactic ℓ, b
75.110° · 6.950°
Ecliptic λ, β
314.596° · 59.627°
HTM-20 index
-659563302
Similar Worlds
Kepler-513 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.20 R⊕ · 1,527.3 ly
Kepler-100 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.20 R⊕ · 993.6 ly
TOI-1203 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.20 R⊕ · 212.0 ly
Kepler-1862 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.20 R⊕ · 4,018.9 ly
Kepler-23 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.21 R⊕ · 2,725.9 ly
Kepler-1861 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.21 R⊕ · 2,707.0 ly