Key parameters at a glance
- A radius of 3.13 Earth radii
- A mass of 7.14 Earth masses
- Surface gravity around 0.73 g
- An orbital period of 23.668 days
- Semi-major axis 0.1530 AU
- Equilibrium temperature 668 K (395 °C)
- Distance from Earth 1,307.18 light-years
- Earth Similarity Index 0.389
- Travel time at Voyager 1 speed 23,052,194 years
2 siblings around Kepler-104
Kepler-104 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-104 b | Sub-Neptune | 3.10 | 19.60 | 11.428 | 852 | 2014 |
| Kepler-104 c this | Sub-Neptune | 3.13 | 7.14 | 23.668 | 668 | 2014 |
| Kepler-104 d | Sub-Neptune | 3.58 | 5.54 | 51.755 | 515 | 2014 |
Kepler-104 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#406of 1978
top 20.5%
This planet
3.13R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-104 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.13 | 11.21 |
| Mass (M⊕) | 1.00 | 7.14 | 317.83 |
| Density (g/cm³) | 5.51 | 2.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.73 | 2.53 |
| Insolation (S⊕) | 1.00 | 45.44 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 7.144 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 158553540
Gaia DR2
Gaia DR2 2102454253097554304
Gaia DR3
Gaia DR3 2102454253097554304
System
Kepler-104
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 23.67 Earth days (6.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1530 AU.
Transit Fingerprint
Depth
0.045 %
Duration
5.872 h
Impact parameter b
0.770
Rp / R★
0.020240
Transit midpoint (BJD)
2,454,965.7160
Photometric dip
Transit produces a flux drop of 449 ppm lasting ≈ 5.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020240
Semi-major axis / stellar radius
26.800
Impact parameter (b)
0.770
RV semi-amplitude (K)
1.819 m/s
Transit mid-time (BJD)
2,454,965.7160
Angular separation (arcsec)
0.38200
Eq. Temperature
668K
(395 °C)
Insolation (S⊕)
45.44
Earth = 1.00
Earth Similarity (ESI)
0.389
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-104
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,711 K — cooler than the Sun (5,778 K)
Estimated Age
13.18 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.349 R☉
Stellar Mass
0.818 M☉
Metallicity [Fe/H]
-0.42
Extended Stellar Properties
Surface gravity (log g)
4.105 dex
Stellar density
0.730 g/cm³
Systemic radial velocity
4.51 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.467 mas
Total Proper Motion
52.913 mas/yr
PM Right Ascension
4.36 mas/yr
PM Declination
-52.73 mas/yr
Galactic Cartesian (pc)
x = 0.224 · y = -0.706 · z = 0.671
Equatorial (J2000)
RA 287.60466° · Dec 42.16651°
Galactic ℓ, b
73.185° · 14.568°
Ecliptic λ, β
300.457° · 63.756°
HTM-20 index
-1932337153
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Kepler-146 c
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Radius 3.13 R⊕ · 2,337.9 ly