Key parameters at a glance
- A radius of 3.13 Earth radii
- A mass of 9.96 Earth masses
- Surface gravity around 1.02 g
- An orbital period of 76.732 days
- Semi-major axis 0.3640 AU
- Equilibrium temperature 473 K (200 °C)
- Distance from Earth 2,337.88 light-years
- Earth Similarity Index 0.476
- Travel time at Voyager 1 speed 41,228,448 years
1 sibling around Kepler-146
Kepler-146 c 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-146 b | Sub-Neptune | 3.71 | 13.30 | 31.159 | 639 | 2014 |
| Kepler-146 c this | Sub-Neptune | 3.13 | 9.96 | 76.732 | 473 | 2014 |
Kepler-146 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-146 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.13 | 11.21 |
| Mass (M⊕) | 1.00 | 9.96 | 317.83 |
| Density (g/cm³) | 5.51 | 1.78 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.02 | 2.53 |
| Insolation (S⊕) | 1.00 | 9.89 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 138569990
Gaia DR2
Gaia DR2 2052185062520374272
Gaia DR3
Gaia DR3 2052185062520374272
System
Kepler-146
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 76.73 Earth days (21.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3640 AU.
Transit Fingerprint
Depth
0.069 %
Duration
6.216 h
Impact parameter b
0.120
Rp / R★
0.025470
Transit midpoint (BJD)
2,455,033.6708
Photometric dip
Transit produces a flux drop of 686 ppm lasting ≈ 6.22 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025470
Semi-major axis / stellar radius
85.800
Impact parameter (b)
0.120
Transit mid-time (BJD)
2,455,033.6708
Angular separation (arcsec)
0.50800
Eq. Temperature
473K
(200 °C)
Insolation (S⊕)
9.89
Earth = 1.00
Earth Similarity (ESI)
0.476
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-146
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,948 K — hotter than the Sun (5,778 K)
Estimated Age
0.91 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.208 R☉
Stellar Mass
1.079 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.312 dex
Stellar density
1.040 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.366 mas
Total Proper Motion
1.553 mas/yr
PM Right Ascension
-0.71 mas/yr
PM Declination
-1.38 mas/yr
Galactic Cartesian (pc)
x = 0.319 · y = -0.712 · z = 0.625
Equatorial (J2000)
RA 294.11076° · Dec 38.71022°
Galactic ℓ, b
72.214° · 8.607°
Ecliptic λ, β
308.221° · 58.991°
HTM-20 index
1103627386
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Kepler-104 c
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