Key parameters at a glance
- A radius of 2.27 Earth radii
- A mass of 5.77 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 5.214 days
- Equilibrium temperature 866 K (593 °C)
- Distance from Earth 1,364.62 light-years
- Earth Similarity Index 0.302
- Travel time at Voyager 1 speed 24,065,079 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around EPIC 212297394
EPIC 212297394 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| EPIC 212297394 b | Super-Earth | 1.48 | 2.79 | 2.289 | 1,149 | 2019 |
| EPIC 212297394 c this | Sub-Neptune | 2.27 | 5.77 | 5.214 | 866 | 2021 |
EPIC 212297394 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1554of 1978
top 78.5%
This planet
2.27R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | EPIC 212297394 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.27 | 11.21 |
| Mass (M⊕) | 1.00 | 5.77 | 317.83 |
| Density (g/cm³) | 5.51 | 2.71 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 287331845
Gaia DR2
Gaia DR2 6294955311720593024
Gaia DR3
Gaia DR3 6294955311720593024
System
EPIC 212297394
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.21 Earth days (1.4% of a terrestrial year).
Transit Fingerprint
Depth
0.083 %
Duration
2.620 h
Impact parameter b
0.390
Rp / R★
0.025800
Transit midpoint (BJD)
2,457,222.4789
Photometric dip
Transit produces a flux drop of 828 ppm lasting ≈ 2.62 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025800
Semi-major axis / stellar radius
14.450
Impact parameter (b)
0.390
Transit mid-time (BJD)
2,457,222.4789
Eq. Temperature
866K
(593 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.302
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: EPIC 212297394
Spectral Class
K-type orange
Effective Temperature
5,171 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.800 R☉
Stellar Mass
0.830 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.550 dex
Stellar density
2.504 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
2.362 mas
Total Proper Motion
23.157 mas/yr
PM Right Ascension
-23.16 mas/yr
PM Declination
-0.24 mas/yr
Galactic Cartesian (pc)
x = -0.848 · y = -0.436 · z = -0.303
Equatorial (J2000)
RA 207.20612° · Dec -17.60990°
Galactic ℓ, b
321.819° · 43.147°
Ecliptic λ, β
211.530° · -5.983°
HTM-20 index
2078126015
Similar Worlds
Kepler-1503 b
Sub-Neptune · K-type orange
Radius 2.27 R⊕ · 3,997.3 ly
Kepler-306 e
Sub-Neptune · K-type orange
Radius 2.27 R⊕ · 2,529.9 ly
TOI-2018 b
Sub-Neptune · K-type orange
Radius 2.27 R⊕ · 91.3 ly
K2-401 b
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 654.7 ly
Kepler-1996 b
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 1,436.9 ly
K2-346 b
Sub-Neptune · K-type orange
Radius 2.26 R⊕ · 344.4 ly