Key parameters at a glance
- A radius of 0.99 Earth radii
- A mass of 0.94 Earth masses
- Surface gravity around 0.96 g
- An orbital period of 5.629 days
- Semi-major axis 0.0660 AU
- Equilibrium temperature 1,576 K (1303 °C)
- Distance from Earth 871.89 light-years
- Earth Similarity Index 0.193
- Travel time at Voyager 1 speed 15,375,779 years
2 siblings around Kepler-381
Kepler-381 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-381 b this | Rocky Terrestrial | 0.99 | 0.94 | 5.629 | 1,576 | 2014 |
| Kepler-381 d | Rocky Terrestrial | 1.07 | 1.23 | 8.256 | 1,387 | 2021 |
| Kepler-381 c | Rocky Terrestrial | 1.12 | 1.46 | 13.392 | 1,180 | 2014 |
Kepler-381 b Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#346of 570
top 60.5%
This planet
0.99R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-381 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 0.99 | 11.21 |
| Mass (M⊕) | 1.00 | 0.94 | 317.83 |
| Density (g/cm³) | 5.51 | 5.31 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.96 | 2.53 |
| Insolation (S⊕) | 1.00 | 716.09 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 164884235
Gaia DR2
Gaia DR2 2105835281411929728
Gaia DR3
Gaia DR3 2105835281411929728
System
Kepler-381
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.63 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0660 AU.
Transit Fingerprint
Depth
0.004 %
Duration
3.913 h
Impact parameter b
0.290
Rp / R★
0.005807
Transit midpoint (BJD)
2,454,967.7462
Photometric dip
Transit produces a flux drop of 38 ppm lasting ≈ 3.91 h.
Extended Orbital Architecture
Planet / star radius ratio
0.005807
Semi-major axis / stellar radius
11.290
Impact parameter (b)
0.290
Transit mid-time (BJD)
2,454,967.7462
Angular separation (arcsec)
0.24700
Eq. Temperature
1,576K
(1303 °C)
Insolation (S⊕)
716.09
Earth = 1.00
Earth Similarity (ESI)
0.193
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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-381
Spectral Class
F-type yellow-white
Effective Temperature
6,152 K — hotter than the Sun (5,778 K)
Estimated Age
2.57 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.568 R☉
Stellar Mass
1.144 M☉
Metallicity [Fe/H]
-0.20
Extended Stellar Properties
Surface gravity (log g)
4.120 dex
Stellar density
0.370 g/cm³
Systemic radial velocity
-2.03 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
3.712 mas
Total Proper Motion
19.890 mas/yr
PM Right Ascension
14.97 mas/yr
PM Declination
-13.10 mas/yr
Galactic Cartesian (pc)
x = 0.189 · y = -0.696 · z = 0.693
Equatorial (J2000)
RA 285.18287° · Dec 43.83103°
Galactic ℓ, b
74.072° · 16.843°
Ecliptic λ, β
297.474° · 65.828°
HTM-20 index
170532617
Similar Worlds
Kepler-1278 b
Rocky Terrestrial · F-type yellow-white
Radius 1.01 R⊕ · 2,900.9 ly
Kepler-1443 b
Rocky Terrestrial · F-type yellow-white
Radius 0.97 R⊕ · 1,936.2 ly
Kepler-1293 b
Rocky Terrestrial · F-type yellow-white
Radius 0.97 R⊕ · 3,353.4 ly
Kepler-1285 b
Rocky Terrestrial · F-type yellow-white
Radius 0.97 R⊕ · 1,377.3 ly
Kepler-1947 b
Rocky Terrestrial · F-type yellow-white
Radius 1.01 R⊕ · 1,528.9 ly
Kepler-524 c
Rocky Terrestrial · F-type yellow-white
Radius 0.96 R⊕ · 3,451.5 ly