Key parameters at a glance
- A radius of 1.03 Earth radii
- A mass of 1.08 Earth masses
- Surface gravity around 1.02 g
- An orbital period of 6.792 days
- Semi-major axis 0.0680 AU
- Equilibrium temperature 994 K (721 °C)
- Distance from Earth 2,612.68 light-years
- Earth Similarity Index 0.326
- Travel time at Voyager 1 speed 46,074,594 years
1 sibling around Kepler-387
Kepler-387 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-387 b this | Rocky Terrestrial | 1.03 | 1.08 | 6.792 | 994 | 2014 |
| Kepler-387 c | Rocky Terrestrial | 0.89 | 0.64 | 11.838 | 826 | 2014 |
Kepler-387 b Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#297of 570
top 51.9%
This planet
1.03R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-387 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.03 | 11.21 |
| Mass (M⊕) | 1.00 | 1.08 | 317.83 |
| Density (g/cm³) | 5.51 | 5.43 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.02 | 2.53 |
| Insolation (S⊕) | 1.00 | 304.08 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158559417
Gaia DR2
Gaia DR2 2130255885640736768
Gaia DR3
Gaia DR3 2130255885640736768
System
Kepler-387
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.79 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0680 AU.
Transit Fingerprint
Depth
0.010 %
Duration
3.197 h
Impact parameter b
0.030
Rp / R★
0.009320
Transit midpoint (BJD)
2,454,969.4873
Photometric dip
Transit produces a flux drop of 103 ppm lasting ≈ 3.20 h.
Extended Orbital Architecture
Planet / star radius ratio
0.009320
Semi-major axis / stellar radius
15.560
Impact parameter (b)
0.030
Transit mid-time (BJD)
2,454,969.4873
Angular separation (arcsec)
0.08490
Eq. Temperature
994K
(721 °C)
Insolation (S⊕)
304.08
Earth = 1.00
Earth Similarity (ESI)
0.326
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-387
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,774 K — cooler than the Sun (5,778 K)
Estimated Age
1.01 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.046 R☉
Stellar Mass
0.850 M☉
Metallicity [Fe/H]
-0.30
Extended Stellar Properties
Surface gravity (log g)
4.353 dex
Stellar density
0.610 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.220 mas
Total Proper Motion
15.503 mas/yr
PM Right Ascension
13.57 mas/yr
PM Declination
7.50 mas/yr
Galactic Cartesian (pc)
x = 0.214 · y = -0.666 · z = 0.715
Equatorial (J2000)
RA 287.79827° · Dec 45.65677°
Galactic ℓ, b
76.566° · 15.816°
Ecliptic λ, β
303.227° · 67.054°
HTM-20 index
1211633163
Similar Worlds
Kepler-1612 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.03 R⊕ · 2,494.2 ly
Kepler-374 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.03 R⊕ · 4,127.9 ly
Kepler-1312 c
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.03 R⊕ · 975.5 ly
Kepler-130 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.02 R⊕ · 1,032.8 ly
Kepler-336 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.02 R⊕ · 2,507.7 ly
Kepler-192 d
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.02 R⊕ · 2,125.5 ly