Key parameters at a glance
- A radius of 2.88 Earth radii
- A mass of 8.65 Earth masses
- Surface gravity around 1.04 g
- An orbital period of 2.060 days
- Distance from Earth 2,243.87 light-years
- Earth Similarity Index 0.654
- Travel time at Voyager 1 speed 39,570,561 years
- Almost certainly tidally locked to its host star given the close orbit
K2-378 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#653of 1978
top 33.0%
This planet
2.88R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-378 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.88 | 11.21 |
| Mass (M⊕) | 1.00 | 8.65 | 317.83 |
| Density (g/cm³) | 5.51 | 1.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.04 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 741119
Gaia DR2
Gaia DR2 3616517223789495424
Gaia DR3
Gaia DR3 3616517223789495424
System
K2-378
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.06 Earth days (0.6% of a terrestrial year).
Transit Fingerprint
Depth
0.170 %
Duration
1.490 h
Impact parameter b
0.402
Rp / R★
0.036000
Transit midpoint (BJD)
2,457,217.8493
Photometric dip
Transit produces a flux drop of 1,697 ppm lasting ≈ 1.49 h.
Extended Orbital Architecture
Planet / star radius ratio
0.036000
Semi-major axis / stellar radius
9.520
Impact parameter (b)
0.402
Transit mid-time (BJD)
2,457,217.8493
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.654
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: K2-378
Spectral Class
K-type orange
Effective Temperature
4,823 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.732 R☉
Stellar Mass
0.923 M☉
Metallicity [Fe/H]
-0.21
Extended Stellar Properties
Surface gravity (log g)
4.674 dex
Stellar density
2.789 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
1.426 mas
Total Proper Motion
31.284 mas/yr
PM Right Ascension
-4.12 mas/yr
PM Declination
-31.01 mas/yr
Galactic Cartesian (pc)
x = -0.888 · y = -0.417 · z = -0.193
Equatorial (J2000)
RA 205.15966° · Dec -11.11723°
Galactic ℓ, b
321.883° · 49.935°
Ecliptic λ, β
207.349° · -0.628°
HTM-20 index
115506308
Similar Worlds
Kepler-391 c
Sub-Neptune · K-type orange
Radius 2.88 R⊕ · 2,835.1 ly
Kepler-1684 b
Sub-Neptune · K-type orange
Radius 2.87 R⊕ · 2,028.7 ly
Kepler-781 b
Sub-Neptune · K-type orange
Radius 2.89 R⊕ · 3,471.8 ly
HIP 54373 b
Sub-Neptune · K-type orange
Radius 2.87 R⊕ · 61.0 ly
K2-255 b
Sub-Neptune · K-type orange
Radius 2.90 R⊕ · 624.9 ly
Kepler-1388 d
Sub-Neptune · K-type orange
Radius 2.86 R⊕ · 1,480.1 ly