Key parameters at a glance
- A radius of 2.84 Earth radii
- A mass of 8.45 Earth masses
- Surface gravity around 1.05 g
- An orbital period of 31.518 days
- Semi-major axis 0.2040 AU
- Equilibrium temperature 663 K (390 °C)
- Distance from Earth 2,131.76 light-years
- Earth Similarity Index 0.363
- Travel time at Voyager 1 speed 37,593,508 years
1 sibling around Kepler-133
Kepler-133 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-133 b | Super-Earth | 1.76 | 3.75 | 8.130 | 1,041 | 2014 |
| Kepler-133 c this | Sub-Neptune | 2.84 | 8.45 | 31.518 | 663 | 2014 |
Kepler-133 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#694of 1978
top 35.0%
This planet
2.84R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-133 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.84 | 11.21 |
| Mass (M⊕) | 1.00 | 8.45 | 317.83 |
| Density (g/cm³) | 5.51 | 2.03 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.05 | 2.53 |
| Insolation (S⊕) | 1.00 | 67.16 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 28089143
Gaia DR2
Gaia DR2 2086718317558873984
Gaia DR3
Gaia DR3 2086718317558873984
System
Kepler-133
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 31.52 Earth days (8.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2040 AU.
Transit Fingerprint
Depth
0.036 %
Duration
7.765 h
Impact parameter b
0.680
Rp / R★
0.018690
Transit midpoint (BJD)
2,455,018.1532
Photometric dip
Transit produces a flux drop of 358 ppm lasting ≈ 7.77 h.
Extended Orbital Architecture
Planet / star radius ratio
0.018690
Semi-major axis / stellar radius
22.300
Impact parameter (b)
0.680
Transit mid-time (BJD)
2,455,018.1532
Angular separation (arcsec)
0.31200
Eq. Temperature
663K
(390 °C)
Insolation (S⊕)
67.16
Earth = 1.00
Earth Similarity (ESI)
0.363
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-133
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,736 K — cooler than the Sun (5,778 K)
Estimated Age
6.03 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.425 R☉
Stellar Mass
1.020 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.186 dex
Stellar density
0.290 g/cm³
Systemic radial velocity
10.16 km/s
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.503 mas
Total Proper Motion
11.540 mas/yr
PM Right Ascension
-10.20 mas/yr
PM Declination
5.40 mas/yr
Galactic Cartesian (pc)
x = 0.305 · y = -0.591 · z = 0.747
Equatorial (J2000)
RA 297.27789° · Dec 48.32035°
Galactic ℓ, b
81.907° · 11.140°
Ecliptic λ, β
321.182° · 66.975°
HTM-20 index
2086522824
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Kepler-288 c
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