Key parameters at a glance
- A radius of 2.53 Earth radii
- A mass of 6.94 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 14.401 days
- Semi-major axis 0.1170 AU
- Equilibrium temperature 828 K (555 °C)
- Distance from Earth 2,239.79 light-years
- Earth Similarity Index 0.304
- Travel time at Voyager 1 speed 39,498,664 years
1 sibling around Kepler-204
Kepler-204 b 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 this | Sub-Neptune | 2.53 | 6.94 | 14.401 | 828 | 2014 |
| Kepler-204 c | Super-Earth | 1.79 | 3.86 | 25.661 | 683 | 2014 |
Kepler-204 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1133of 1978
top 57.2%
This planet
2.53R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-204 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.53 | 11.21 |
| Mass (M⊕) | 1.00 | 6.94 | 317.83 |
| Density (g/cm³) | 5.51 | 2.35 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 79.70 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 120495446
Gaia DR2
Gaia DR2 2104071978297949056
Gaia DR3
Gaia DR3 2104071978297949056
System
Kepler-204
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 14.40 Earth days (3.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1170 AU.
Transit Fingerprint
Depth
0.040 %
Duration
3.906 h
Impact parameter b
0.570
Rp / R★
0.019100
Transit midpoint (BJD)
2,455,007.9859
Photometric dip
Transit produces a flux drop of 396 ppm lasting ≈ 3.91 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019100
Semi-major axis / stellar radius
14.040
Impact parameter (b)
0.570
Transit mid-time (BJD)
2,455,007.9859
Angular separation (arcsec)
0.17000
Eq. Temperature
828K
(555 °C)
Insolation (S⊕)
79.70
Earth = 1.00
Earth Similarity (ESI)
0.304
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-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
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Kepler-896 b
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Kepler-727 b
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TOI-1136 g
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Kepler-153 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.53 R⊕ · 1,498.3 ly