Key parameters at a glance
- A radius of 2.11 Earth radii
- A mass of 5.10 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 10.367 days
- Equilibrium temperature 437 K (164 °C)
- Distance from Earth 529.70 light-years
- Earth Similarity Index 0.594
- Travel time at Voyager 1 speed 9,341,320 years
- Almost certainly tidally locked to its host star given the close orbit
K2-345 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1806of 1978
top 91.3%
This planet
2.11R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-345 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.11 | 11.21 |
| Mass (M⊕) | 1.00 | 5.10 | 317.83 |
| Density (g/cm³) | 5.51 | 2.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 238608004
Gaia DR2
Gaia DR2 685979983106267136
Gaia DR3
Gaia DR3 685979983106267136
System
K2-345
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.37 Earth days (2.8% of a terrestrial year).
Transit Fingerprint
Depth
0.195 %
Duration
2.080 h
Impact parameter b
0.430
Rp / R★
0.036700
Transit midpoint (BJD)
2,457,141.7103
Photometric dip
Transit produces a flux drop of 1,946 ppm lasting ≈ 2.08 h.
Extended Orbital Architecture
Planet / star radius ratio
0.036700
Semi-major axis / stellar radius
36.120
Impact parameter (b)
0.430
Transit mid-time (BJD)
2,457,141.7103
Eq. Temperature
437K
(164 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.594
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: K2-345
Spectral Class
K-type orange
Effective Temperature
3,779 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.520 R☉
Stellar Mass
0.560 M☉
Metallicity [Fe/H]
0.26
Extended Stellar Properties
Surface gravity (log g)
4.740 dex
Stellar density
4.812 g/cm³
Rotation period
18.47 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
6.129 mas
Total Proper Motion
59.529 mas/yr
PM Right Ascension
-56.23 mas/yr
PM Declination
-19.54 mas/yr
Galactic Cartesian (pc)
x = -0.630 · y = 0.682 · z = 0.371
Equatorial (J2000)
RA 132.70759° · Dec 21.78904°
Galactic ℓ, b
204.483° · 35.490°
Ecliptic λ, β
129.143° · 3.965°
HTM-20 index
1624634564
Similar Worlds
Kepler-705 b
Sub-Neptune · K-type orange
Radius 2.11 R⊕ · 903.1 ly
TOI-1238 c
Sub-Neptune · K-type orange
Radius 2.11 R⊕ · 230.6 ly
Kepler-1880 b
Sub-Neptune · K-type orange
Radius 2.12 R⊕ · 1,992.9 ly
Kepler-1895 b
Sub-Neptune · K-type orange
Radius 2.12 R⊕ · 3,210.0 ly
Kepler-161 b
Sub-Neptune · K-type orange
Radius 2.12 R⊕ · 1,417.6 ly
HD 39194 d
Sub-Neptune · K-type orange
Radius 2.12 R⊕ · 86.1 ly