Key parameters at a glance
- A radius of 2.54 Earth radii
- A mass of 6.99 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 50.921 days
- Semi-major axis 0.2450 AU
- Distance from Earth 1,049.32 light-years
- Earth Similarity Index 0.698
- Travel time at Voyager 1 speed 18,504,680 years
K2-118 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1117of 1978
top 56.4%
This planet
2.54R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-118 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.54 | 11.21 |
| Mass (M⊕) | 1.00 | 6.99 | 317.83 |
| Density (g/cm³) | 5.51 | 2.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 4.30 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 293496724
Gaia DR2
Gaia DR2 609814922864694400
Gaia DR3
Gaia DR3 609814922864694400
System
K2-118
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 50.92 Earth days (13.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2450 AU.
Transit Fingerprint
Depth
0.119 %
Duration
4.104 h
Rp / R★
0.031741
Transit midpoint (BJD)
2,457,160.4730
Photometric dip
Transit produces a flux drop of 1,193 ppm lasting ≈ 4.10 h.
Extended Orbital Architecture
Planet / star radius ratio
0.031741
Semi-major axis / stellar radius
71.820
Transit mid-time (BJD)
2,457,160.4730
Long. of periastron (ω)
58.67°
Angular separation (arcsec)
0.76200
Eq. Temperature
—
Insolation (S⊕)
4.30
Earth = 1.00
Earth Similarity (ESI)
0.698
0 = alien, 1 = Earth-identical
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: K2-118
Spectral Class
K-type orange
Effective Temperature
4,726 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.735 R☉
Stellar Mass
0.756 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
4.534 dex
Stellar density
2.227 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.080 mas
Total Proper Motion
20.976 mas/yr
PM Right Ascension
-7.56 mas/yr
PM Declination
-19.57 mas/yr
Galactic Cartesian (pc)
x = -0.646 · y = 0.714 · z = 0.270
Equatorial (J2000)
RA 132.12686° · Dec 15.65590°
Galactic ℓ, b
211.192° · 32.821°
Ecliptic λ, β
130.261° · -2.091°
HTM-20 index
-1572591782
Similar Worlds
TOI-1648 b
Sub-Neptune · K-type orange
Radius 2.54 R⊕ · 227.8 ly
K2-16 c
Sub-Neptune · K-type orange
Radius 2.54 R⊕ · 1,092.5 ly
Kepler-991 b
Sub-Neptune · K-type orange
Radius 2.54 R⊕ · 1,270.6 ly
K2-119 b
Sub-Neptune · K-type orange
Radius 2.53 R⊕ · 1,192.4 ly
Kepler-156 c
Sub-Neptune · K-type orange
Radius 2.55 R⊕ · 1,446.4 ly
Kepler-577 b
Sub-Neptune · K-type orange
Radius 2.55 R⊕ · 1,709.9 ly