Key parameters at a glance
- A radius of 3.27 Earth radii
- A mass of 10.70 Earth masses
- Surface gravity around 1.00 g
- An orbital period of 56.777 days
- Semi-major axis 0.2980 AU
- Equilibrium temperature 491 K (218 °C)
- Distance from Earth 4,450.50 light-years
- Earth Similarity Index 0.453
- Travel time at Voyager 1 speed 78,484,501 years
1 sibling around Kepler-1085
Kepler-1085 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-1085 c this | Sub-Neptune | 3.27 | 10.70 | 56.777 | 491 | 2020 |
| Kepler-1085 b | Neptune-like | 7.22 | 41.20 | 219.322 | 313 | 2016 |
Kepler-1085 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#302of 1978
top 15.2%
This planet
3.27R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1085 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.27 | 11.21 |
| Mass (M⊕) | 1.00 | 10.70 | 317.83 |
| Density (g/cm³) | 5.51 | 1.68 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.00 | 2.53 |
| Insolation (S⊕) | 1.00 | 11.80 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158487108
Gaia DR2
Gaia DR2 2130321925058256384
Gaia DR3
Gaia DR3 2130321925058256384
System
Kepler-1085
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 56.78 Earth days (15.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2980 AU.
Transit Fingerprint
Depth
0.088 %
Duration
6.538 h
Impact parameter b
0.305
Rp / R★
0.028260
Transit midpoint (BJD)
2,455,014.0979
Photometric dip
Transit produces a flux drop of 884 ppm lasting ≈ 6.54 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028260
Semi-major axis / stellar radius
65.100
Impact parameter (b)
0.305
Transit mid-time (BJD)
2,455,014.0979
Angular separation (arcsec)
0.21800
Eq. Temperature
491K
(218 °C)
Insolation (S⊕)
11.80
Earth = 1.00
Earth Similarity (ESI)
0.453
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
Armstrong et al. 2021Instrument
Kepler CCD Array
Publication
2021-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Kepler (12 shown).
Host System: Kepler-1085
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,816 K — hotter than the Sun (5,778 K)
Estimated Age
1.07 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.078 R☉
Stellar Mass
1.050 M☉
Metallicity [Fe/H]
0.22
Extended Stellar Properties
Surface gravity (log g)
4.394 dex
Stellar density
1.181 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.704 mas
Total Proper Motion
0.159 mas/yr
PM Right Ascension
0.16 mas/yr
PM Declination
0.03 mas/yr
Galactic Cartesian (pc)
x = 0.208 · y = -0.661 · z = 0.721
Equatorial (J2000)
RA 287.47764° · Dec 46.14117°
Galactic ℓ, b
76.942° · 16.209°
Ecliptic λ, β
303.069° · 67.584°
HTM-20 index
-1735555335
Similar Worlds
TOI-1117 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.27 R⊕ · 546.6 ly
Kepler-1990 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.27 R⊕ · 1,280.9 ly
Kepler-576 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.27 R⊕ · 2,014.2 ly
TOI-1249 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.27 R⊕ · 455.0 ly
Kepler-1097 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.26 R⊕ · 2,347.7 ly
Kepler-726 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.26 R⊕ · 2,485.6 ly