Key parameters at a glance
- A radius of 4.09 Earth radii
- A mass of 15.70 Earth masses
- Surface gravity around 0.94 g
- An orbital period of 9.439 days
- Semi-major axis 0.0840 AU
- Equilibrium temperature 686 K (413 °C)
- Distance from Earth 2,164.73 light-years
- Earth Similarity Index 0.302
- Travel time at Voyager 1 speed 38,175,069 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around Kepler-247
Kepler-247 c 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-247 b | Super-Earth | 1.64 | 3.33 | 3.336 | 970 | 2014 |
| Kepler-247 c this | Neptune-like | 4.09 | 15.70 | 9.439 | 686 | 2014 |
| Kepler-247 d | Sub-Neptune | 3.94 | 14.70 | 20.478 | 530 | 2014 |
Kepler-247 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#548of 574
top 95.3%
This planet
4.09R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-247 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.09 | 11.21 |
| Mass (M⊕) | 1.00 | 15.70 | 317.83 |
| Density (g/cm³) | 5.51 | 1.26 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.94 | 2.53 |
| Insolation (S⊕) | 1.00 | 53.90 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158792051
Gaia DR2
Gaia DR2 2102911576914748032
Gaia DR3
Gaia DR3 2102911581215700096
System
Kepler-247
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.44 Earth days (2.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0840 AU.
Transit Fingerprint
Depth
0.304 %
Duration
2.896 h
Impact parameter b
0.140
Rp / R★
0.050257
Transit midpoint (BJD)
2,455,010.1854
Photometric dip
Transit produces a flux drop of 3,036 ppm lasting ≈ 2.90 h.
Extended Orbital Architecture
Planet / star radius ratio
0.050257
Semi-major axis / stellar radius
26.081
Impact parameter (b)
0.140
Transit mid-time (BJD)
2,455,010.1854
Angular separation (arcsec)
0.12700
Eq. Temperature
686K
(413 °C)
Insolation (S⊕)
53.90
Earth = 1.00
Earth Similarity (ESI)
0.302
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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
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-247
Spectral Class
K-type orange
Effective Temperature
5,100 K — cooler than the Sun (5,778 K)
Estimated Age
2.14 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.768 R☉
Stellar Mass
0.887 M☉
Metallicity [Fe/H]
0.30
Extended Stellar Properties
Surface gravity (log g)
4.608 dex
Stellar density
1.680 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.478 mas
Total Proper Motion
17.702 mas/yr
PM Right Ascension
5.53 mas/yr
PM Declination
16.82 mas/yr
Galactic Cartesian (pc)
x = 0.234 · y = -0.693 · z = 0.683
Equatorial (J2000)
RA 288.64256° · Dec 43.03938°
Galactic ℓ, b
74.328° · 14.221°
Ecliptic λ, β
302.698° · 64.377°
HTM-20 index
112671829
Similar Worlds
Kepler-815 b
Neptune-like · K-type orange
Radius 4.11 R⊕ · 4,107.2 ly
Kepler-248 c
Neptune-like · K-type orange
Radius 4.07 R⊕ · 2,409.6 ly
HD 190007 b
Neptune-like · K-type orange
Radius 4.06 R⊕ · 41.5 ly
Kepler-258 b
Neptune-like · K-type orange
Radius 4.06 R⊕ · 1,878.6 ly
HD 77338 b
Neptune-like · K-type orange
Radius 4.12 R⊕ · 149.8 ly
TOI-1472 b
Neptune-like · K-type orange
Radius 4.06 R⊕ · 397.4 ly