Key parameters at a glance
- A radius of 2.26 Earth radii
- A mass of 5.73 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 26.201 days
- Equilibrium temperature 450 K (177 °C)
- Distance from Earth 344.36 light-years
- Earth Similarity Index 0.565
- Travel time at Voyager 1 speed 6,072,709 years
- Almost certainly tidally locked to its host star given the close orbit
K2-346 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1572of 1978
top 79.4%
This planet
2.26R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-346 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.26 | 11.21 |
| Mass (M⊕) | 1.00 | 5.73 | 317.83 |
| Density (g/cm³) | 5.51 | 2.73 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.81 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 14570099
Gaia DR2
Gaia DR2 677884760027950080
Gaia DR3
Gaia DR3 677884760027950080
System
K2-346
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 26.20 Earth days (7.2% of a terrestrial year).
Transit Fingerprint
Depth
0.097 %
Duration
3.330 h
Impact parameter b
0.420
Rp / R★
0.029700
Transit midpoint (BJD)
2,457,164.3902
Photometric dip
Transit produces a flux drop of 965 ppm lasting ≈ 3.33 h.
Extended Orbital Architecture
Planet / star radius ratio
0.029700
Semi-major axis / stellar radius
56.680
Impact parameter (b)
0.420
Transit mid-time (BJD)
2,457,164.3902
Eq. Temperature
450K
(177 °C)
Insolation (S⊕)
8.81
Earth = 1.00
Earth Similarity (ESI)
0.565
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.
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: K2-346
Spectral Class
K-type orange
Effective Temperature
4,801 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.700 R☉
Stellar Mass
0.710 M☉
Metallicity [Fe/H]
-0.18
Extended Stellar Properties
Surface gravity (log g)
4.600 dex
Stellar density
2.939 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
9.443 mas
Total Proper Motion
133.530 mas/yr
PM Right Ascension
-126.23 mas/yr
PM Declination
43.54 mas/yr
Galactic Cartesian (pc)
x = -0.542 · y = 0.747 · z = 0.385
Equatorial (J2000)
RA 125.98649° · Dec 22.66323°
Galactic ℓ, b
201.108° · 29.885°
Ecliptic λ, β
122.890° · 3.239°
HTM-20 index
2125078136
Similar Worlds
Kepler-1996 b
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 1,436.9 ly
Kepler-1261 b
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 2,427.6 ly
Kepler-568 b
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 426.1 ly
Kepler-1242 b
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 2,242.7 ly
Kepler-1388 c
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 1,480.1 ly
K2-5 c
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 661.9 ly