Key parameters at a glance
- A radius of 1.73 Earth radii
- A mass of 3.64 Earth masses
- Surface gravity around 1.22 g
- An orbital period of 26.584 days
- Semi-major axis 0.1346 AU
- Equilibrium temperature 296 K (23 °C)
- Distance from Earth 245.17 light-years
- Earth Similarity Index 0.860
- Travel time at Voyager 1 speed 4,323,616 years
- Almost certainly tidally locked to its host star given the close orbit
3 siblings around K2-133
K2-133 e shares its host star with 3 other confirmed planets. Side-by-side measurements below.
K2-133 e Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#356of 1176
top 30.2%
This planet
1.73R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-133 e | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.73 | 11.21 |
| Mass (M⊕) | 1.00 | 3.64 | 317.83 |
| Density (g/cm³) | 5.51 | 3.86 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.22 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.80 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 150096001
Gaia DR2
Gaia DR2 148080473682357376
Gaia DR3
Gaia DR3 148080473682357376
System
K2-133
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 26.58 Earth days (7.3% of a terrestrial year) at a mean orbital distance of 0.1346 AU.
Transit Fingerprint
Depth
0.099 %
Duration
1.440 h
Impact parameter b
0.928
Rp / R★
0.034800
Transit midpoint (BJD)
2,457,837.8657
Photometric dip
Transit produces a flux drop of 987 ppm lasting ≈ 1.44 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034800
Impact parameter (b)
0.928
Transit mid-time (BJD)
2,457,837.8657
Angular separation (arcsec)
1.79000
Eq. Temperature
296K
(23 °C)
Insolation (S⊕)
1.80
Earth = 1.00
Earth Similarity (ESI)
0.860
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Wells et al. 2019Instrument
Kepler CCD Array
Publication
2019-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2019 at K2 (12 shown).
Host System: K2-133
Spectral Class
M-type red dwarf
Effective Temperature
3,655 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.455 R☉
Stellar Mass
0.461 M☉
Metallicity [Fe/H]
—
Extended Stellar Properties
Surface gravity (log g)
4.770 dex
Stellar density
6.630 g/cm³
Systemic radial velocity
107.20 km/s
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
13.274 mas
Total Proper Motion
191.359 mas/yr
PM Right Ascension
185.66 mas/yr
PM Declination
-46.36 mas/yr
Galactic Cartesian (pc)
x = 0.308 · y = 0.852 · z = 0.423
Equatorial (J2000)
RA 70.14938° · Dec 25.00981°
Galactic ℓ, b
174.754° · -14.068°
Ecliptic λ, β
72.052° · 2.799°
HTM-20 index
-1995439910
Similar Worlds
LHS 1140 b
Super-Earth · M-type red dwarf
Radius 1.73 R⊕ · 48.9 ly
Kepler-231 b
Super-Earth · M-type red dwarf
Radius 1.73 R⊕ · 1,032.7 ly
LHS 1903 e
Super-Earth · M-type red dwarf
Radius 1.73 R⊕ · 116.4 ly
TOI-5799 b
Super-Earth · M-type red dwarf
Radius 1.73 R⊕ · 90.7 ly
Kepler-560 b
Super-Earth · M-type red dwarf
Radius 1.72 R⊕ · 356.5 ly
TOI-1266 d
Super-Earth · M-type red dwarf
Radius 1.74 R⊕ · 117.5 ly