Key parameters at a glance
- A radius of 1.64 Earth radii
- A mass of 3.33 Earth masses
- Surface gravity around 1.24 g
- An orbital period of 20.307 days
- Semi-major axis 0.1220 AU
- Equilibrium temperature 389 K (116 °C)
- Distance from Earth 520.94 light-years
- Earth Similarity Index 0.712
- Travel time at Voyager 1 speed 9,186,712 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-205
Kepler-205 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-205 b | Super-Earth | 1.51 | 2.89 | 2.756 | 757 | 2014 |
| Kepler-205 c this | Super-Earth | 1.64 | 3.33 | 20.307 | 389 | 2014 |
Kepler-205 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#495of 1176
top 42.0%
This planet
1.64R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-205 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.64 | 11.21 |
| Mass (M⊕) | 1.00 | 3.33 | 317.83 |
| Density (g/cm³) | 5.51 | 4.15 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 7.14 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 399822422
Gaia DR2
Gaia DR2 2104076204545773440
Gaia DR3
Gaia DR3 2104076204545773440
System
Kepler-205
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 20.31 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1220 AU.
Transit Fingerprint
Depth
0.071 %
Duration
2.873 h
Impact parameter b
0.810
Rp / R★
0.023000
Transit midpoint (BJD)
2,455,005.6562
Photometric dip
Transit produces a flux drop of 711 ppm lasting ≈ 2.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023000
Semi-major axis / stellar radius
26.000
Impact parameter (b)
0.810
Transit mid-time (BJD)
2,455,005.6562
Angular separation (arcsec)
0.76400
Eq. Temperature
389K
(116 °C)
Insolation (S⊕)
7.14
Earth = 1.00
Earth Similarity (ESI)
0.712
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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-205
Spectral Class
M-type red dwarf
Effective Temperature
4,321 K — cooler than the Sun (5,778 K)
Estimated Age
4.42 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.546 R☉
Stellar Mass
0.592 M☉
Metallicity [Fe/H]
-0.13
Extended Stellar Properties
Surface gravity (log g)
4.735 dex
Stellar density
1.977 g/cm³
Systemic radial velocity
44.12 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
6.232 mas
Total Proper Motion
89.082 mas/yr
PM Right Ascension
-72.61 mas/yr
PM Declination
-51.60 mas/yr
Galactic Cartesian (pc)
x = 0.196 · y = -0.718 · z = 0.667
Equatorial (J2000)
RA 285.28669° · Dec 41.86094°
Galactic ℓ, b
72.198° · 16.035°
Ecliptic λ, β
296.505° · 63.900°
HTM-20 index
2144272227
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