Key parameters at a glance
- A radius of 2.73 Earth radii
- A mass of 12.80 Earth masses
- Surface gravity around 1.72 g
- An orbital period of 10.044 days
- Semi-major axis 0.0970 AU
- Equilibrium temperature 951 K (678 °C)
- Distance from Earth 4,672.54 light-years
- Earth Similarity Index 0.271
- Travel time at Voyager 1 speed 82,400,300 years
2 siblings around Kepler-385
Kepler-385 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-385 b this | Sub-Neptune | 2.73 | 12.80 | 10.044 | 951 | 2014 |
| Kepler-385 c | Sub-Neptune | 3.04 | 13.20 | 15.163 | 829 | 2014 |
| Kepler-385 d | Sub-Neptune | 2.62 | 7.36 | 56.416 | 535 | 2020 |
Kepler-385 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#823of 1978
top 41.6%
This planet
2.73R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-385 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.73 | 11.21 |
| Mass (M⊕) | 1.00 | 12.80 | 317.83 |
| Density (g/cm³) | 5.51 | 3.46 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.72 | 2.53 |
| Insolation (S⊕) | 1.00 | 143.92 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 12.800 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 27082352
Gaia DR2
Gaia DR2 2135203000771400320
Gaia DR3
Gaia DR3 2135203000771400320
System
Kepler-385
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.04 Earth days (2.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0970 AU.
Transit Fingerprint
Depth
0.044 %
Duration
4.597 h
Impact parameter b
0.840
Rp / R★
0.020100
Transit midpoint (BJD)
2,455,186.6250
Photometric dip
Transit produces a flux drop of 438 ppm lasting ≈ 4.60 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020100
Semi-major axis / stellar radius
5.300
Impact parameter (b)
0.840
Transit mid-time (BJD)
2,455,186.6250
Angular separation (arcsec)
0.06770
Eq. Temperature
951K
(678 °C)
Insolation (S⊕)
143.92
Earth = 1.00
Earth Similarity (ESI)
0.271
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-385
Spectral Class
F-type yellow-white
Effective Temperature
6,326 K — hotter than the Sun (5,778 K)
Estimated Age
3.31 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.126 R☉
Stellar Mass
0.992 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.412 dex
Stellar density
0.790 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.669 mas
Total Proper Motion
5.989 mas/yr
PM Right Ascension
2.64 mas/yr
PM Declination
-5.38 mas/yr
Galactic Cartesian (pc)
x = 0.263 · y = -0.582 · z = 0.770
Equatorial (J2000)
RA 294.33851° · Dec 50.33652°
Galactic ℓ, b
82.840° · 13.767°
Ecliptic λ, β
319.160° · 69.654°
HTM-20 index
371213697
Similar Worlds
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Sub-Neptune · F-type yellow-white
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Kepler-193 c
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Kepler-1543 b
Sub-Neptune · F-type yellow-white
Radius 2.71 R⊕ · 3,006.5 ly