Key parameters at a glance
- A radius of 1.64 Earth radii
- A mass of 3.33 Earth masses
- Surface gravity around 1.24 g
- An orbital period of 9.758 days
- Semi-major axis 0.0774 AU
- Distance from Earth 405.93 light-years
- Earth Similarity Index 0.859
- 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 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
K2-148 d Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#495of 1176
top 42.0%
This planet
1.64R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-148 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.64 | 11.21 |
| Mass (M⊕) | 1.00 | 3.33 | 317.83 |
| Density (g/cm³) | 5.51 | 4.15 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 16.80 | 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 9.76 Earth days (2.7% of a terrestrial year) at a mean orbital distance of 0.0774 AU.
Transit Fingerprint
Depth
0.050 %
Duration
1.800 h
Rp / R★
0.023800
Transit midpoint (BJD)
2,457,386.3431
Photometric dip
Transit produces a flux drop of 504 ppm lasting ≈ 1.80 h.
Extended Orbital Architecture
Planet / star radius ratio
0.023800
Semi-major axis / stellar radius
36.300
Transit mid-time (BJD)
2,457,386.3431
Angular separation (arcsec)
0.62200
Eq. Temperature
—
Insolation (S⊕)
16.80
Earth = 1.00
Earth Similarity (ESI)
0.859
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-247 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 2,164.7 ly
Kepler-441 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 874.1 ly
Kepler-1136 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 1,602.8 ly
Kepler-1206 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 2,485.4 ly
Kepler-331 d
Super-Earth · K-type orange
Radius 1.64 R⊕ · 1,892.1 ly
Kepler-658 b
Super-Earth · K-type orange
Radius 1.63 R⊕ · 1,266.7 ly