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 6.923 days
- Semi-major axis 0.0616 AU
- Distance from Earth 405.93 light-years
- Earth Similarity Index 0.839
- Travel time at Voyager 1 speed 7,158,526 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around K2-148
K2-148 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
K2-148 c 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 | K2-148 c | 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 | 26.50 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 423358488
Gaia DR2
Gaia DR2 2536443724641751808
Gaia DR3
Gaia DR3 2536443724641751808
System
K2-148
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.92 Earth days (1.9% of a terrestrial year) at a mean orbital distance of 0.0616 AU.
Transit Fingerprint
Depth
0.054 %
Duration
2.030 h
Rp / R★
0.025100
Transit midpoint (BJD)
2,457,387.7278
Photometric dip
Transit produces a flux drop of 537 ppm lasting ≈ 2.03 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025100
Semi-major axis / stellar radius
27.300
Transit mid-time (BJD)
2,457,387.7278
Angular separation (arcsec)
0.49500
Eq. Temperature
—
Insolation (S⊕)
26.50
Earth = 1.00
Earth Similarity (ESI)
0.839
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water). Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Hirano et al. 2018Instrument
Kepler CCD Array
Publication
2018-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-148
Spectral Class
K-type orange
Effective Temperature
4,079 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.632 R☉
Stellar Mass
0.650 M☉
Metallicity [Fe/H]
-0.11
Extended Stellar Properties
Surface gravity (log g)
4.653 dex
Stellar density
2.943 g/cm³
Systemic radial velocity
1.52 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
8.006 mas
Total Proper Motion
45.323 mas/yr
PM Right Ascension
-38.70 mas/yr
PM Declination
-23.59 mas/yr
Galactic Cartesian (pc)
x = 0.968 · y = 0.251 · z = -0.003
Equatorial (J2000)
RA 14.51765° · Dec -0.19326°
Galactic ℓ, b
126.589° · -63.018°
Ecliptic λ, β
13.285° · -5.901°
HTM-20 index
-1835770589
Similar Worlds
Kepler-1059 b
Super-Earth · K-type orange
Radius 1.73 R⊕ · 2,326.0 ly
K2-199 b
Super-Earth · K-type orange
Radius 1.73 R⊕ · 350.7 ly
Kepler-327 d
Super-Earth · K-type orange
Radius 1.73 R⊕ · 789.3 ly
Kepler-1608 b
Super-Earth · K-type orange
Radius 1.73 R⊕ · 2,713.6 ly
Kepler-1350 c
Super-Earth · K-type orange
Radius 1.73 R⊕ · 1,111.2 ly
Kepler-1856 b
Super-Earth · K-type orange
Radius 1.73 R⊕ · 2,768.3 ly