Key parameters at a glance
- A radius of 3.10 Earth radii
- A mass of 19.60 Earth masses
- Surface gravity around 2.04 g
- An orbital period of 11.428 days
- Semi-major axis 0.0940 AU
- Equilibrium temperature 852 K (579 °C)
- Distance from Earth 1,307.18 light-years
- Earth Similarity Index 0.302
- Travel time at Voyager 1 speed 23,052,194 years
2 siblings around Kepler-104
Kepler-104 b 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 this | Sub-Neptune | 3.10 | 19.60 | 11.428 | 852 | 2014 |
| Kepler-104 c | 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 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#433of 1978
top 21.8%
This planet
3.10R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-104 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.10 | 11.21 |
| Mass (M⊕) | 1.00 | 19.60 | 317.83 |
| Density (g/cm³) | 5.51 | 4.06 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.04 | 2.53 |
| Insolation (S⊕) | 1.00 | 119.91 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 19.600 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 9.945 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 11.43 Earth days (3.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0940 AU.
Transit Fingerprint
Depth
0.050 %
Duration
4.565 h
Impact parameter b
0.450
Rp / R★
0.020712
Transit midpoint (BJD)
2,454,970.6131
Photometric dip
Transit produces a flux drop of 501 ppm lasting ≈ 4.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020712
Semi-major axis / stellar radius
19.407
Impact parameter (b)
0.450
RV semi-amplitude (K)
3.228 m/s
Transit mid-time (BJD)
2,454,970.6131
Angular separation (arcsec)
0.23500
Eq. Temperature
852K
(579 °C)
Insolation (S⊕)
119.91
Earth = 1.00
Earth Similarity (ESI)
0.302
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
Similar Worlds
Kepler-536 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.10 R⊕ · 1,507.9 ly
Kepler-209 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.10 R⊕ · 1,881.7 ly
Kepler-282 e
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.10 R⊕ · 4,362.7 ly
TOI-1062 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.10 R⊕ · 268.0 ly
Kepler-692 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.11 R⊕ · 3,233.3 ly
Kepler-227 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.11 R⊕ · 3,532.5 ly