Key parameters at a glance
- A radius of 2.20 Earth radii
- A mass of 5.48 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 11.954 days
- Semi-major axis 0.0885 AU
- Equilibrium temperature 525 K (252 °C)
- Distance from Earth 1,651.76 light-years
- Earth Similarity Index 0.499
- Travel time at Voyager 1 speed 29,128,872 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1378 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1673of 1978
top 84.5%
This planet
2.20R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1378 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.20 | 11.21 |
| Mass (M⊕) | 1.00 | 5.48 | 317.83 |
| Density (g/cm³) | 5.51 | 2.83 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 14.87 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 169459324
Gaia DR2
Gaia DR2 2073733325763480320
Gaia DR3
Gaia DR3 2073733325763480320
System
Kepler-1378
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.95 Earth days (3.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0885 AU.
Transit Fingerprint
Depth
0.086 %
Duration
2.644 h
Impact parameter b
0.744
Rp / R★
0.029761
Transit midpoint (BJD)
2,454,973.2644
Photometric dip
Transit produces a flux drop of 856 ppm lasting ≈ 2.64 h.
Extended Orbital Architecture
Planet / star radius ratio
0.029761
Semi-major axis / stellar radius
28.900
Impact parameter (b)
0.744
Transit mid-time (BJD)
2,454,973.2644
Angular separation (arcsec)
0.17500
Eq. Temperature
525K
(252 °C)
Insolation (S⊕)
14.87
Earth = 1.00
Earth Similarity (ESI)
0.499
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
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-1378
Spectral Class
K-type orange
Effective Temperature
4,407 K — cooler than the Sun (5,778 K)
Estimated Age
6.46 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.670 R☉
Stellar Mass
0.700 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
4.630 dex
Stellar density
3.195 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
1.948 mas
Total Proper Motion
12.036 mas/yr
PM Right Ascension
11.34 mas/yr
PM Declination
4.04 mas/yr
Galactic Cartesian (pc)
x = 0.350 · y = -0.677 · z = 0.648
Equatorial (J2000)
RA 297.37340° · Dec 40.36640°
Galactic ℓ, b
74.904° · 7.203°
Ecliptic λ, β
313.966° · 59.697°
HTM-20 index
-1808299169
Similar Worlds
Kepler-169 e
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 1,325.9 ly
Kepler-229 b
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 2,694.9 ly
Kepler-240 c
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 2,436.1 ly
HD 110067 b
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 104.9 ly
Kepler-57 c
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 2,100.9 ly
Kepler-55 c
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 1,887.8 ly