Key parameters at a glance
- A radius of 1.69 Earth radii
- A mass of 3.51 Earth masses
- Surface gravity around 1.23 g
- An orbital period of 5.096 days
- Equilibrium temperature 643 K (370 °C)
- Distance from Earth 319.68 light-years
- Earth Similarity Index 0.452
- Travel time at Voyager 1 speed 5,637,600 years
- Almost certainly tidally locked to its host star given the close orbit
K2-394 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#414of 1176
top 35.1%
This planet
1.69R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-394 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.69 | 11.21 |
| Mass (M⊕) | 1.00 | 3.51 | 317.83 |
| Density (g/cm³) | 5.51 | 3.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.23 | 2.53 |
| Insolation (S⊕) | 1.00 | 28.51 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 436575927
Gaia DR2
Gaia DR2 3406132644545570432
Gaia DR3
Gaia DR3 3406132644545570432
System
K2-394
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.10 Earth days (1.4% of a terrestrial year).
Transit Fingerprint
Depth
0.071 %
Duration
1.772 h
Impact parameter b
0.636
Rp / R★
0.024500
Transit midpoint (BJD)
2,457,825.2859
Photometric dip
Transit produces a flux drop of 714 ppm lasting ≈ 1.77 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024500
Semi-major axis / stellar radius
15.960
Impact parameter (b)
0.636
Transit mid-time (BJD)
2,457,825.2859
Eq. Temperature
643K
(370 °C)
Insolation (S⊕)
28.51
Earth = 1.00
Earth Similarity (ESI)
0.452
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
Christiansen et al. 2022Instrument
Kepler CCD Array
Publication
2022-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2022 at K2 (12 shown).
Host System: K2-394
Spectral Class
K-type orange
Effective Temperature
4,938 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.631 R☉
Stellar Mass
0.478 M☉
Metallicity [Fe/H]
-0.39
Extended Stellar Properties
Surface gravity (log g)
4.515 dex
Stellar density
2.667 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
10.174 mas
Total Proper Motion
45.280 mas/yr
PM Right Ascension
39.14 mas/yr
PM Declination
-22.76 mas/yr
Galactic Cartesian (pc)
x = 0.310 · y = 0.907 · z = 0.284
Equatorial (J2000)
RA 71.11000° · Dec 16.51858°
Galactic ℓ, b
182.283° · -18.623°
Ecliptic λ, β
71.819° · -5.737°
HTM-20 index
-2010700247
Similar Worlds
K2-377 b
Super-Earth · K-type orange
Radius 1.69 R⊕ · 636.5 ly
Kepler-1148 b
Super-Earth · K-type orange
Radius 1.69 R⊕ · 2,040.7 ly
K2-131 b
Super-Earth · K-type orange
Radius 1.69 R⊕ · 497.4 ly
Kepler-674 b
Super-Earth · K-type orange
Radius 1.69 R⊕ · 1,116.3 ly
Kepler-968 c
Super-Earth · K-type orange
Radius 1.69 R⊕ · 946.9 ly
K2-381 d
Super-Earth · K-type orange
Radius 1.69 R⊕ · 475.2 ly