Key parameters at a glance
- A radius of 2.02 Earth radii
- A mass of 4.74 Earth masses
- Surface gravity around 1.16 g
- An orbital period of 20.729 days
- Semi-major axis 0.1390 AU
- Equilibrium temperature 530 K (257 °C)
- Distance from Earth 1,522.28 light-years
- Earth Similarity Index 0.510
- Travel time at Voyager 1 speed 26,845,480 years
1 sibling around Kepler-185
Kepler-185 c 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-185 b | Rocky Terrestrial | 1.17 | 1.71 | 1.633 | 1,237 | 2014 |
| Kepler-185 c this | Sub-Neptune | 2.02 | 4.74 | 20.729 | 530 | 2014 |
Kepler-185 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1927of 1978
top 97.4%
This planet
2.02R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-185 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.02 | 11.21 |
| Mass (M⊕) | 1.00 | 4.74 | 317.83 |
| Density (g/cm³) | 5.51 | 3.16 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 16.03 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 123490444
Gaia DR2
Gaia DR2 2105316247502568576
Gaia DR3
Gaia DR3 2105316247502568576
System
Kepler-185
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 20.73 Earth days (5.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1390 AU.
Transit Fingerprint
Depth
0.056 %
Duration
2.781 h
Impact parameter b
0.570
Rp / R★
0.021755
Transit midpoint (BJD)
2,455,018.4364
Photometric dip
Transit produces a flux drop of 562 ppm lasting ≈ 2.78 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021755
Semi-major axis / stellar radius
56.850
Impact parameter (b)
0.570
Transit mid-time (BJD)
2,455,018.4364
Angular separation (arcsec)
0.29800
Eq. Temperature
530K
(257 °C)
Insolation (S⊕)
16.03
Earth = 1.00
Earth Similarity (ESI)
0.510
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-185
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,208 K — cooler than the Sun (5,778 K)
Estimated Age
11.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.806 R☉
Stellar Mass
0.763 M☉
Metallicity [Fe/H]
-0.14
Extended Stellar Properties
Surface gravity (log g)
4.545 dex
Stellar density
2.020 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.114 mas
Total Proper Motion
15.132 mas/yr
PM Right Ascension
11.17 mas/yr
PM Declination
10.21 mas/yr
Galactic Cartesian (pc)
x = 0.156 · y = -0.704 · z = 0.693
Equatorial (J2000)
RA 282.46817° · Dec 43.88995°
Galactic ℓ, b
73.398° · 18.693°
Ecliptic λ, β
292.812° · 66.344°
HTM-20 index
-676720491
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