Key parameters at a glance
- A radius of 3.58 Earth radii
- A mass of 5.54 Earth masses
- Surface gravity around 0.43 g
- An orbital period of 51.755 days
- Semi-major axis 0.2570 AU
- Equilibrium temperature 515 K (242 °C)
- Distance from Earth 1,307.18 light-years
- Earth Similarity Index 0.446
- Travel time at Voyager 1 speed 23,052,194 years
2 siblings around Kepler-104
Kepler-104 d 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 | Sub-Neptune | 3.13 | 7.14 | 23.668 | 668 | 2014 |
| Kepler-104 d this | Sub-Neptune | 3.58 | 5.54 | 51.755 | 515 | 2014 |
Kepler-104 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#144of 1978
top 7.2%
This planet
3.58R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-104 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.58 | 11.21 |
| Mass (M⊕) | 1.00 | 5.54 | 317.83 |
| Density (g/cm³) | 5.51 | 1.67 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.43 | 2.53 |
| Insolation (S⊕) | 1.00 | 16.01 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 5.540 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 51.76 Earth days (14.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2570 AU.
Transit Fingerprint
Depth
0.061 %
Duration
7.465 h
Impact parameter b
0.760
Rp / R★
0.023280
Transit midpoint (BJD)
2,455,104.0861
Photometric dip
Transit produces a flux drop of 609 ppm lasting ≈ 7.47 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023280
Semi-major axis / stellar radius
45.200
Impact parameter (b)
0.760
RV semi-amplitude (K)
1.087 m/s
Transit mid-time (BJD)
2,455,104.0861
Angular separation (arcsec)
0.64100
Eq. Temperature
515K
(242 °C)
Insolation (S⊕)
16.01
Earth = 1.00
Earth Similarity (ESI)
0.446
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-219 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.58 R⊕ · 2,567.1 ly
Kepler-729 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.58 R⊕ · 6,265.9 ly
K2-217 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.58 R⊕ · 1,245.5 ly
Kepler-734 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.56 R⊕ · 3,774.3 ly
Kepler-148 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.60 R⊕ · 2,580.4 ly
Kepler-119 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.60 R⊕ · 2,289.6 ly