Key parameters at a glance
- A radius of 1.20 Earth radii
- A mass of 8.70 Earth masses
- Surface gravity around 6.04 g
- An orbital period of 17.913 days
- Semi-major axis 0.1300 AU
- Equilibrium temperature 626 K (353 °C)
- Distance from Earth 2,495.17 light-years
- Earth Similarity Index 0.451
- Travel time at Voyager 1 speed 44,002,408 years
3 siblings around Kepler-85
Kepler-85 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-85 b | Super-Earth | 1.78 | 1.84 | 8.300 | 809 | 2012 |
| Kepler-85 c | Super-Earth | 1.98 | 2.15 | 12.510 | 706 | 2012 |
| Kepler-85 d this | Rocky Terrestrial | 1.20 | 8.70 | 17.913 | 626 | 2014 |
| Kepler-85 e | Super-Earth | 1.27 | 0.60 | 25.217 | 559 | 2014 |
Kepler-85 d Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#75of 570
top 13.0%
This planet
1.20R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-85 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.20 | 11.21 |
| Mass (M⊕) | 1.00 | 8.70 | 317.83 |
| Density (g/cm³) | 5.51 | 4.40 | 1.33 |
| Surface Gravity (g) | 1.00 | 6.04 | 2.53 |
| Insolation (S⊕) | 1.00 | 38.39 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 8.697 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 159580705
Gaia DR2
Gaia DR2 2127398083121764736
Gaia DR3
Gaia DR3 2127398083121764736
System
Kepler-85
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.91 Earth days (4.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1300 AU.
Transit Fingerprint
Depth
0.020 %
Duration
4.510 h
Impact parameter b
0.000
Rp / R★
0.013296
Transit midpoint (BJD)
2,454,968.5377
Photometric dip
Transit produces a flux drop of 198 ppm lasting ≈ 4.51 h.
Extended Orbital Architecture
Planet / star radius ratio
0.013296
Semi-major axis / stellar radius
12.290
Impact parameter (b)
0.000
Transit mid-time (BJD)
2,454,968.5377
Angular separation (arcsec)
0.17000
Eq. Temperature
626K
(353 °C)
Insolation (S⊕)
38.39
Earth = 1.00
Earth Similarity (ESI)
0.451
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-85
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,436 K — cooler than the Sun (5,778 K)
Estimated Age
1.38 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.893 R☉
Stellar Mass
0.947 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.494 dex
Stellar density
1.460 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.279 mas
Total Proper Motion
6.093 mas/yr
PM Right Ascension
-0.03 mas/yr
PM Declination
-6.09 mas/yr
Galactic Cartesian (pc)
x = 0.252 · y = -0.657 · z = 0.711
Equatorial (J2000)
RA 290.97344° · Dec 45.29028°
Galactic ℓ, b
77.152° · 13.632°
Ecliptic λ, β
308.195° · 65.971°
HTM-20 index
1597129256
Similar Worlds
Kepler-282 c
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.20 R⊕ · 4,362.7 ly
Kepler-1500 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.20 R⊕ · 3,972.0 ly
Kepler-770 c
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.20 R⊕ · 3,034.7 ly
K2-187 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.20 R⊕ · 1,079.3 ly
EPIC 212624936 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.20 R⊕ · 1,832.8 ly
Kepler-206 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.20 R⊕ · 1,938.8 ly