Key parameters at a glance
- A radius of 1.92 Earth radii
- A mass of 4.35 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 19.507 days
- Equilibrium temperature 508 K (235 °C)
- Distance from Earth 1,175.34 light-years
- Earth Similarity Index 0.539
- Travel time at Voyager 1 speed 20,727,045 years
- Almost certainly tidally locked to its host star given the close orbit
K2-339 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#102of 1176
top 8.6%
This planet
1.92R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-339 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.92 | 11.21 |
| Mass (M⊕) | 1.00 | 4.35 | 317.83 |
| Density (g/cm³) | 5.51 | 3.38 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 175241633
Gaia DR2
Gaia DR2 659493675706526848
Gaia DR3
Gaia DR3 659493675706526848
System
K2-339
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 19.51 Earth days (5.3% of a terrestrial year).
Transit Fingerprint
Depth
0.124 %
Duration
3.400 h
Impact parameter b
0.440
Rp / R★
0.024400
Transit midpoint (BJD)
2,457,153.0047
Photometric dip
Transit produces a flux drop of 1,237 ppm lasting ≈ 3.40 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024400
Semi-major axis / stellar radius
40.710
Impact parameter (b)
0.440
Transit mid-time (BJD)
2,457,153.0047
Eq. Temperature
508K
(235 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.539
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: K2-339
Spectral Class
K-type orange
Effective Temperature
4,857 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.720 R☉
Stellar Mass
0.740 M☉
Metallicity [Fe/H]
-0.11
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
2.849 g/cm³
Rotation period
11.13 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
2.747 mas
Total Proper Motion
3.316 mas/yr
PM Right Ascension
-2.05 mas/yr
PM Declination
-2.61 mas/yr
Galactic Cartesian (pc)
x = -0.610 · y = 0.725 · z = 0.320
Equatorial (J2000)
RA 130.08254° · Dec 18.69290°
Galactic ℓ, b
206.991° · 32.127°
Ecliptic λ, β
127.581° · 0.330°
HTM-20 index
1080814266
Similar Worlds
K2-322 b
Super-Earth · K-type orange
Radius 1.92 R⊕ · 402.5 ly
Kepler-1987 e
Super-Earth · K-type orange
Radius 1.92 R⊕ · 1,942.9 ly
TOI-1467 b
Super-Earth · K-type orange
Radius 1.92 R⊕ · 122.1 ly
HD 3167 d
Super-Earth · K-type orange
Radius 1.92 R⊕ · 154.2 ly
K2-414 c
Super-Earth · K-type orange
Radius 1.93 R⊕ · 848.1 ly
K2-49 b
Super-Earth · K-type orange
Radius 1.93 R⊕ · 1,490.9 ly