Key parameters at a glance
- A radius of 1.97 Earth radii
- A mass of 4.54 Earth masses
- Surface gravity around 1.17 g
- An orbital period of 7.386 days
- Semi-major axis 0.0656 AU
- Equilibrium temperature 601 K (328 °C)
- Distance from Earth 335.79 light-years
- Earth Similarity Index 0.458
- Travel time at Voyager 1 speed 5,921,610 years
- Almost certainly tidally locked to its host star given the close orbit
K2-126 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#38of 1176
top 3.1%
This planet
1.97R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-126 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.97 | 11.21 |
| Mass (M⊕) | 1.00 | 4.54 | 317.83 |
| Density (g/cm³) | 5.51 | 3.26 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.17 | 2.53 |
| Insolation (S⊕) | 1.00 | 35.30 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 422349422
Gaia DR2
Gaia DR2 3606785098479012864
Gaia DR3
Gaia DR3 3606785098479012864
System
K2-126
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.39 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0656 AU.
Transit Fingerprint
Depth
0.088 %
Duration
2.587 h
Impact parameter b
0.400
Rp / R★
0.027900
Transit midpoint (BJD)
2,457,223.7992
Photometric dip
Transit produces a flux drop of 882 ppm lasting ≈ 2.59 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027900
Semi-major axis / stellar radius
20.290
Impact parameter (b)
0.400
Transit mid-time (BJD)
2,457,223.7992
Long. of periastron (ω)
-33.72°
Angular separation (arcsec)
0.63700
Eq. Temperature
601K
(328 °C)
Insolation (S⊕)
35.30
Earth = 1.00
Earth Similarity (ESI)
0.458
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Dressing et al. 2017Instrument
Kepler CCD Array
Publication
2017-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2017 at K2 (12 shown).
Host System: K2-126
Spectral Class
K-type orange
Effective Temperature
4,339 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.650 R☉
Stellar Mass
0.690 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.660 dex
Stellar density
2.903 g/cm³
Systemic radial velocity
1.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
9.685 mas
Total Proper Motion
37.050 mas/yr
PM Right Ascension
36.13 mas/yr
PM Declination
-8.21 mas/yr
Galactic Cartesian (pc)
x = -0.891 · y = -0.388 · z = -0.235
Equatorial (J2000)
RA 203.54670° · Dec -13.57697°
Galactic ℓ, b
318.559° · 47.993°
Ecliptic λ, β
206.772° · -3.492°
HTM-20 index
978186193
Similar Worlds
Kepler-224 e
Super-Earth · K-type orange
Radius 1.97 R⊕ · 2,550.8 ly
K2-81 b
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Kepler-174 b
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GJ 9827 d
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Radius 1.96 R⊕ · 1,804.4 ly