Key parameters at a glance
- A radius of 2.41 Earth radii
- A mass of 6.39 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 7.187 days
- Equilibrium temperature 640 K (367 °C)
- Distance from Earth 1,044.80 light-years
- Earth Similarity Index 0.401
- Travel time at Voyager 1 speed 18,424,960 years
- Almost certainly tidally locked to its host star given the close orbit
K2-347 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1312of 1978
top 66.3%
This planet
2.41R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-347 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.41 | 11.21 |
| Mass (M⊕) | 1.00 | 6.39 | 317.83 |
| Density (g/cm³) | 5.51 | 2.51 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 14603874
Gaia DR2
Gaia DR2 678119333962115072
Gaia DR3
Gaia DR3 678119333962115072
System
K2-347
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.19 Earth days (2.0% of a terrestrial year).
Transit Fingerprint
Depth
0.183 %
Duration
2.570 h
Impact parameter b
0.210
Rp / R★
0.033500
Transit midpoint (BJD)
2,457,140.6993
Photometric dip
Transit produces a flux drop of 1,829 ppm lasting ≈ 2.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.033500
Semi-major axis / stellar radius
21.520
Impact parameter (b)
0.210
Transit mid-time (BJD)
2,457,140.6993
Eq. Temperature
640K
(367 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.401
0 = alien, 1 = Earth-identical
Insufficient insolation data — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
De Leon et al. 2021Instrument
Kepler CCD Array
Publication
2021-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at K2 (12 shown).
Host System: K2-347
Spectral Class
K-type orange
Effective Temperature
4,599 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.630 R☉
Stellar Mass
0.660 M☉
Metallicity [Fe/H]
-0.26
Extended Stellar Properties
Surface gravity (log g)
4.650 dex
Stellar density
4.122 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.093 mas
Total Proper Motion
52.548 mas/yr
PM Right Ascension
-52.11 mas/yr
PM Declination
6.75 mas/yr
Galactic Cartesian (pc)
x = -0.545 · y = 0.740 · z = 0.396
Equatorial (J2000)
RA 126.37268° · Dec 23.29741°
Galactic ℓ, b
200.549° · 30.428°
Ecliptic λ, β
123.087° · 3.939°
HTM-20 index
2005672191
Similar Worlds
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K2-367 b
Sub-Neptune · K-type orange
Radius 2.41 R⊕ · 577.2 ly