Key parameters at a glance
- A radius of 3.04 Earth radii
- A mass of 9.48 Earth masses
- Surface gravity around 1.03 g
- An orbital period of 85.517 days
- Semi-major axis 0.3802 AU
- Equilibrium temperature 482 K (209 °C)
- Distance from Earth 4,236.38 light-years
- Earth Similarity Index 0.474
- Travel time at Voyager 1 speed 74,708,470 years
2 siblings around Kepler-347
Kepler-347 d 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-347 b | Super-Earth | 1.97 | 4.54 | 12.798 | 908 | 2014 |
| Kepler-347 c | Super-Earth | 1.75 | 3.71 | 27.321 | 705 | 2014 |
| Kepler-347 d this | Sub-Neptune | 3.04 | 9.48 | 85.517 | 482 | 2023 |
Kepler-347 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#481of 1978
top 24.3%
This planet
3.04R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-347 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.04 | 11.21 |
| Mass (M⊕) | 1.00 | 9.48 | 317.83 |
| Density (g/cm³) | 5.51 | 1.85 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.03 | 2.53 |
| Insolation (S⊕) | 1.00 | 12.75 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 299158566
Gaia DR2
Gaia DR2 2132614922197436928
Gaia DR3
Gaia DR3 2132614922197436928
System
Kepler-347
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 85.52 Earth days (23.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3802 AU.
Transit Fingerprint
Depth
0.027 %
Duration
9.331 h
Impact parameter b
0.944
Rp / R★
0.019208
Transit midpoint (BJD)
2,455,014.3510
Photometric dip
Transit produces a flux drop of 270 ppm lasting ≈ 9.33 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019208
Semi-major axis / stellar radius
27.000
Impact parameter (b)
0.944
Transit mid-time (BJD)
2,455,014.3510
Angular separation (arcsec)
0.29300
Eq. Temperature
482K
(209 °C)
Insolation (S⊕)
12.75
Earth = 1.00
Earth Similarity (ESI)
0.474
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
Valizadegan et al. 2023Instrument
Kepler CCD Array
Publication
2023-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Kepler (12 shown).
Host System: Kepler-347
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,592 K — cooler than the Sun (5,778 K)
Estimated Age
11.75 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.451 R☉
Stellar Mass
1.000 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.115 dex
Stellar density
0.051 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.741 mas
Total Proper Motion
16.464 mas/yr
PM Right Ascension
-1.61 mas/yr
PM Declination
-16.39 mas/yr
Galactic Cartesian (pc)
x = 0.214 · y = -0.616 · z = 0.758
Equatorial (J2000)
RA 289.19960° · Dec 49.30564°
Galactic ℓ, b
80.449° · 16.358°
Ecliptic λ, β
309.149° · 70.147°
HTM-20 index
430245161
Similar Worlds
Kepler-1490 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.04 R⊕ · 2,814.5 ly
Kepler-227 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.04 R⊕ · 3,532.5 ly
Kepler-1844 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.04 R⊕ · 5,885.0 ly
TOI-261.01
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.04 R⊕ · 373.4 ly
Kepler-1664 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.03 R⊕ · 2,044.0 ly
Kepler-1779 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.03 R⊕ · 2,963.1 ly