Key parameters at a glance
- A radius of 0.75 Earth radii
- A mass of 0.35 Earth masses
- Surface gravity around 0.62 g
- An orbital period of 16.092 days
- Semi-major axis 0.1120 AU
- Equilibrium temperature 503 K (230 °C)
- Distance from Earth 496.06 light-years
- Earth Similarity Index 0.589
- 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 b 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 this | Rocky Terrestrial | 0.75 | 0.35 | 16.092 | 503 | 2014 |
| Kepler-378 c | Rocky Terrestrial | 0.70 | 0.27 | 28.906 | 414 | 2014 |
Kepler-378 b Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#508of 570
top 88.9%
This planet
0.75R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-378 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 0.75 | 11.21 |
| Mass (M⊕) | 1.00 | 0.35 | 317.83 |
| Density (g/cm³) | 5.51 | 4.52 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.62 | 2.53 |
| Insolation (S⊕) | 1.00 | 17.82 | 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 16.09 Earth days (4.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1120 AU.
Transit Fingerprint
Depth
0.014 %
Duration
1.937 h
Impact parameter b
0.540
Rp / R★
0.010500
Transit midpoint (BJD)
2,454,975.5135
Photometric dip
Transit produces a flux drop of 137 ppm lasting ≈ 1.94 h.
Extended Orbital Architecture
Planet / star radius ratio
0.010500
Semi-major axis / stellar radius
23.200
Impact parameter (b)
0.540
Transit mid-time (BJD)
2,454,975.5135
Angular separation (arcsec)
0.73600
Eq. Temperature
503K
(230 °C)
Insolation (S⊕)
17.82
Earth = 1.00
Earth Similarity (ESI)
0.589
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
HD 23472 d
Rocky Terrestrial · K-type orange
Radius 0.75 R⊕ · 127.3 ly
Kepler-444 f
Rocky Terrestrial · K-type orange
Radius 0.74 R⊕ · 118.8 ly
K2-413 b
Rocky Terrestrial · K-type orange
Radius 0.76 R⊕ · 930.1 ly
Kepler-345 b
Rocky Terrestrial · K-type orange
Radius 0.74 R⊕ · 848.0 ly
Kepler-1967 b
Rocky Terrestrial · K-type orange
Radius 0.73 R⊕ · 812.5 ly
Kepler-124 b
Rocky Terrestrial · K-type orange
Radius 0.73 R⊕ · 1,370.0 ly