Key parameters at a glance
- A radius of 2.30 Earth radii
- A mass of 28.50 Earth masses
- Surface gravity around 5.39 g
- An orbital period of 34.921 days
- Semi-major axis 0.2199 AU
- Equilibrium temperature 602 K (329 °C)
- Distance from Earth 7,218.45 light-years
- Earth Similarity Index 0.418
- Travel time at Voyager 1 speed 127,297,394 years
1 sibling around Kepler-328
Kepler-328 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-328 b this | Sub-Neptune | 2.30 | 28.50 | 34.921 | 602 | 2013 |
| Kepler-328 c | Neptune-like | 5.40 | 39.40 | 71.312 | 475 | 2013 |
Kepler-328 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1499of 1978
top 75.7%
This planet
2.30R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-328 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.30 | 11.21 |
| Mass (M⊕) | 1.00 | 28.50 | 317.83 |
| Density (g/cm³) | 5.51 | 7.80 | 1.33 |
| Surface Gravity (g) | 1.00 | 5.39 | 2.53 |
| Insolation (S⊕) | 1.00 | 57.08 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 28.500 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 184164097
Gaia DR2
Gaia DR2 2076373321899335808
Gaia DR3
Gaia DR3 2076373321899335808
System
Kepler-328
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 34.92 Earth days (9.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2199 AU.
Transit Fingerprint
Depth
0.050 %
Duration
9.874 h
Impact parameter b
0.030
Rp / R★
0.020479
Transit midpoint (BJD)
2,454,990.6317
Photometric dip
Transit produces a flux drop of 500 ppm lasting ≈ 9.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020479
Semi-major axis / stellar radius
11.140
Impact parameter (b)
0.030
Transit mid-time (BJD)
2,454,990.6317
Angular separation (arcsec)
0.09940
Eq. Temperature
602K
(329 °C)
Insolation (S⊕)
57.08
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
Discovery cohort
Planets confirmed in 2013 at Kepler (12 shown).
Host System: Kepler-328
Spectral Class
F-type yellow-white
Effective Temperature
6,064 K — hotter than the Sun (5,778 K)
Estimated Age
2.57 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.060 R☉
Stellar Mass
1.150 M☉
Metallicity [Fe/H]
0.08
Extended Stellar Properties
Surface gravity (log g)
4.440 dex
Stellar density
0.993 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.425 mas
Total Proper Motion
5.963 mas/yr
PM Right Ascension
-2.81 mas/yr
PM Declination
-5.26 mas/yr
Galactic Cartesian (pc)
x = 0.333 · y = -0.690 · z = 0.643
Equatorial (J2000)
RA 295.80928° · Dec 40.00849°
Galactic ℓ, b
74.000° · 8.070°
Ecliptic λ, β
311.497° · 59.784°
HTM-20 index
-1224775228
Similar Worlds
Kepler-116 c
Sub-Neptune · F-type yellow-white
Radius 2.30 R⊕ · 3,115.3 ly
K2-74 b
Sub-Neptune · F-type yellow-white
Radius 2.31 R⊕ · 1,232.3 ly
Kepler-624 b
Sub-Neptune · F-type yellow-white
Radius 2.31 R⊕ · 2,440.3 ly
Kepler-1201 b
Sub-Neptune · F-type yellow-white
Radius 2.29 R⊕ · 3,079.7 ly
Kepler-379 c
Sub-Neptune · F-type yellow-white
Radius 2.29 R⊕ · 2,385.1 ly
Kepler-1903 b
Sub-Neptune · F-type yellow-white
Radius 2.29 R⊕ · 5,790.7 ly