Key parameters at a glance
- A radius of 8.68 Earth radii
- A mass of 56.30 Earth masses
- Surface gravity around 0.75 g
- An orbital period of 51.847 days
- Semi-major axis 0.2607 AU
- Equilibrium temperature 413 K (140 °C)
- Distance from Earth 2,580.43 light-years
- Earth Similarity Index 0.335
- Travel time at Voyager 1 speed 45,505,803 years
2 siblings around Kepler-148
Kepler-148 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-148 b | Super-Earth | 1.80 | 3.89 | 1.729 | 1,284 | 2014 |
| Kepler-148 c | Sub-Neptune | 3.60 | 12.60 | 4.180 | 957 | 2014 |
| Kepler-148 d this | Neptune-like | 8.68 | 56.30 | 51.847 | 413 | 2016 |
Kepler-148 d Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#107of 574
top 18.5%
This planet
8.68R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-148 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.68 | 11.21 |
| Mass (M⊕) | 1.00 | 56.30 | 317.83 |
| Density (g/cm³) | 5.51 | 0.47 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.75 | 2.53 |
| Insolation (S⊕) | 1.00 | 6.53 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159171904
Gaia DR2
Gaia DR2 2127828988601389440
Gaia DR3
Gaia DR3 2127828988601389440
System
Kepler-148
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 51.85 Earth days (14.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2607 AU.
Transit Fingerprint
Depth
1.031 %
Duration
4.779 h
Impact parameter b
0.681
Rp / R★
0.097849
Transit midpoint (BJD)
2,455,003.0814
Photometric dip
Transit produces a flux drop of 10,314 ppm lasting ≈ 4.78 h.
Extended Orbital Architecture
Planet / star radius ratio
0.097849
Semi-major axis / stellar radius
72.950
Impact parameter (b)
0.681
Transit mid-time (BJD)
2,455,003.0814
Angular separation (arcsec)
0.33000
Eq. Temperature
413K
(140 °C)
Insolation (S⊕)
6.53
Earth = 1.00
Earth Similarity (ESI)
0.335
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-148
Spectral Class
K-type orange
Effective Temperature
5,172 K — cooler than the Sun (5,778 K)
Estimated Age
4.68 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.810 R☉
Stellar Mass
0.860 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.560 dex
Stellar density
2.532 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.235 mas
Total Proper Motion
2.893 mas/yr
PM Right Ascension
-2.87 mas/yr
PM Declination
0.33 mas/yr
Galactic Cartesian (pc)
x = 0.231 · y = -0.643 · z = 0.730
Equatorial (J2000)
RA 289.78616° · Dec 46.85882°
Galactic ℓ, b
78.276° · 15.030°
Ecliptic λ, β
307.641° · 67.729°
HTM-20 index
1774126763
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