Key parameters at a glance
- A radius of 0.70 Earth radii
- A mass of 0.27 Earth masses
- Surface gravity around 0.55 g
- An orbital period of 28.906 days
- Semi-major axis 0.1660 AU
- Equilibrium temperature 414 K (141 °C)
- Distance from Earth 496.06 light-years
- Earth Similarity Index 0.681
- Travel time at Voyager 1 speed 8,748,083 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-378
Kepler-378 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 |
|---|---|---|---|---|---|---|
| Kepler-378 b | Rocky Terrestrial | 0.75 | 0.35 | 16.092 | 503 | 2014 |
| Kepler-378 c this | Rocky Terrestrial | 0.70 | 0.27 | 28.906 | 414 | 2014 |
Kepler-378 c Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#526of 570
top 92.1%
This planet
0.70R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-378 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 0.70 | 11.21 |
| Mass (M⊕) | 1.00 | 0.27 | 317.83 |
| Density (g/cm³) | 5.51 | 4.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.55 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.17 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 271354634
Gaia DR2
Gaia DR2 2080095512350543744
Gaia DR3
Gaia DR3 2080095512350543744
System
Kepler-378
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 28.91 Earth days (7.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1660 AU.
Transit Fingerprint
Depth
0.011 %
Duration
3.043 h
Impact parameter b
0.350
Rp / R★
0.009084
Transit midpoint (BJD)
2,454,991.8217
Photometric dip
Transit produces a flux drop of 105 ppm lasting ≈ 3.04 h.
Extended Orbital Architecture
Planet / star radius ratio
0.009084
Semi-major axis / stellar radius
72.800
Impact parameter (b)
0.350
Transit mid-time (BJD)
2,454,991.8217
Angular separation (arcsec)
1.09000
Eq. Temperature
414K
(141 °C)
Insolation (S⊕)
8.17
Earth = 1.00
Earth Similarity (ESI)
0.681
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
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-378
Spectral Class
K-type orange
Effective Temperature
4,661 K — cooler than the Sun (5,778 K)
Estimated Age
3.24 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.671 R☉
Stellar Mass
0.780 M☉
Metallicity [Fe/H]
0.14
Extended Stellar Properties
Surface gravity (log g)
4.647 dex
Stellar density
3.003 g/cm³
Systemic radial velocity
-61.88 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
6.546 mas
Total Proper Motion
75.708 mas/yr
PM Right Ascension
56.66 mas/yr
PM Declination
50.22 mas/yr
Galactic Cartesian (pc)
x = 0.291 · y = -0.625 · z = 0.725
Equatorial (J2000)
RA 294.94897° · Dec 46.43887°
Galactic ℓ, b
79.458° · 11.652°
Ecliptic λ, β
315.560° · 65.977°
HTM-20 index
-1249959614
Similar Worlds
K2-266 c
Rocky Terrestrial · K-type orange
Radius 0.71 R⊕ · 253.0 ly
EPIC 201497682 b
Rocky Terrestrial · K-type orange
Radius 0.69 R⊕ · 825.3 ly
Kepler-141 b
Rocky Terrestrial · K-type orange
Radius 0.69 R⊕ · 982.3 ly
K2-116 b
Rocky Terrestrial · K-type orange
Radius 0.69 R⊕ · 161.1 ly
Kepler-1558 b
Rocky Terrestrial · K-type orange
Radius 0.68 R⊕ · 1,062.4 ly
Kepler-1850 b
Rocky Terrestrial · K-type orange
Radius 0.73 R⊕ · 816.0 ly