Key parameters at a glance
- A radius of 1.79 Earth radii
- A mass of 3.86 Earth masses
- Surface gravity around 1.20 g
- An orbital period of 25.661 days
- Semi-major axis 0.1730 AU
- Equilibrium temperature 683 K (410 °C)
- Distance from Earth 2,239.79 light-years
- Earth Similarity Index 0.418
- Travel time at Voyager 1 speed 39,498,664 years
1 sibling around Kepler-204
Kepler-204 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-204 b | Sub-Neptune | 2.53 | 6.94 | 14.401 | 828 | 2014 |
| Kepler-204 c this | Super-Earth | 1.79 | 3.86 | 25.661 | 683 | 2014 |
Kepler-204 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#271of 1176
top 23.0%
This planet
1.79R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-204 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.79 | 11.21 |
| Mass (M⊕) | 1.00 | 3.86 | 317.83 |
| Density (g/cm³) | 5.51 | 3.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.20 | 2.53 |
| Insolation (S⊕) | 1.00 | 36.89 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 120495446
Gaia DR2
Gaia DR2 2104071978297949056
Gaia DR3
Gaia DR3 2104071978297949056
System
Kepler-204
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 25.66 Earth days (7.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1730 AU.
Transit Fingerprint
Depth
0.017 %
Duration
4.383 h
Impact parameter b
0.620
Rp / R★
0.012017
Transit midpoint (BJD)
2,454,988.1517
Photometric dip
Transit produces a flux drop of 169 ppm lasting ≈ 4.38 h.
Extended Orbital Architecture
Planet / star radius ratio
0.012017
Semi-major axis / stellar radius
23.400
Impact parameter (b)
0.620
Transit mid-time (BJD)
2,454,988.1517
Angular separation (arcsec)
0.25200
Eq. Temperature
683K
(410 °C)
Insolation (S⊕)
36.89
Earth = 1.00
Earth Similarity (ESI)
0.418
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-204
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,812 K — hotter than the Sun (5,778 K)
Estimated Age
1.41 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.238 R☉
Stellar Mass
1.038 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.269 dex
Stellar density
1.110 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.427 mas
Total Proper Motion
18.732 mas/yr
PM Right Ascension
-3.65 mas/yr
PM Declination
-18.37 mas/yr
Galactic Cartesian (pc)
x = 0.197 · y = -0.719 · z = 0.666
Equatorial (J2000)
RA 285.34716° · Dec 41.76185°
Galactic ℓ, b
72.120° · 15.955°
Ecliptic λ, β
296.550° · 63.793°
HTM-20 index
2138070122
Similar Worlds
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Super-Earth · G-type yellow (Sun-like)
Radius 1.79 R⊕ · 2,901.5 ly
Kepler-1585 b
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Kepler-376 c
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TOI-1347 b
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