Key parameters at a glance
- A radius of 1.69 Earth radii
- A mass of 3.50 Earth masses
- Surface gravity around 1.23 g
- An orbital period of 26.803 days
- Distance from Earth 475.21 light-years
- Earth Similarity Index 0.848
- Travel time at Voyager 1 speed 8,380,373 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around K2-381
K2-381 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
K2-381 d Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#430of 1176
top 36.5%
This planet
1.69R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-381 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.69 | 11.21 |
| Mass (M⊕) | 1.00 | 3.50 | 317.83 |
| Density (g/cm³) | 5.51 | 3.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.23 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 10195089
Gaia DR2
Gaia DR2 4081376064109034496
Gaia DR3
Gaia DR3 4081376064109034496
System
K2-381
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 26.80 Earth days (7.3% of a terrestrial year).
Transit Fingerprint
Depth
0.052 %
Duration
2.928 h
Impact parameter b
0.497
Rp / R★
0.022900
Transit midpoint (BJD)
2,457,307.9152
Photometric dip
Transit produces a flux drop of 522 ppm lasting ≈ 2.93 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022900
Semi-major axis / stellar radius
59.430
Impact parameter (b)
0.497
Transit mid-time (BJD)
2,457,307.9152
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.848
0 = alien, 1 = Earth-identical
Insufficient insolation data. 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: K2-381
Spectral Class
K-type orange
Effective Temperature
4,473 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.675 R☉
Stellar Mass
0.754 M☉
Metallicity [Fe/H]
-0.24
Extended Stellar Properties
Surface gravity (log g)
4.653 dex
Stellar density
3.243 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
6.835 mas
Total Proper Motion
37.644 mas/yr
PM Right Ascension
-34.80 mas/yr
PM Declination
14.35 mas/yr
Galactic Cartesian (pc)
x = 0.289 · y = -0.888 · z = -0.358
Equatorial (J2000)
RA 288.02676° · Dec -21.00758°
Galactic ℓ, b
16.131° · -13.786°
Ecliptic λ, β
286.793° · 1.387°
HTM-20 index
-1461627296
Similar Worlds
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
K2-394 b
Super-Earth · K-type orange
Radius 1.69 R⊕ · 319.7 ly
K2-377 b
Super-Earth · K-type orange
Radius 1.69 R⊕ · 636.5 ly