Key parameters at a glance
- A radius of 2.24 Earth radii
- A mass of 5.65 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 20.507 days
- Semi-major axis 0.1344 AU
- Distance from Earth 1,023.36 light-years
- Earth Similarity Index 0.744
- Travel time at Voyager 1 speed 18,046,955 years
- Almost certainly tidally locked to its host star given the close orbit
K2-48 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1607of 1978
top 81.2%
This planet
2.24R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-48 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.24 | 11.21 |
| Mass (M⊕) | 1.00 | 5.65 | 317.83 |
| Density (g/cm³) | 5.51 | 2.76 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 15.30 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 397022282
Gaia DR2
Gaia DR2 3799841752426128896
Gaia DR3
Gaia DR3 3799841752426128896
System
K2-48
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 20.51 Earth days (5.6% of a terrestrial year) at a mean orbital distance of 0.1344 AU.
Transit Fingerprint
Depth
0.110 %
Duration
3.010 h
Impact parameter b
0.700
Rp / R★
0.028000
Transit midpoint (BJD)
2,456,817.4859
Photometric dip
Transit produces a flux drop of 1,104 ppm lasting ≈ 3.01 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028000
Semi-major axis / stellar radius
42.000
Impact parameter (b)
0.700
Transit mid-time (BJD)
2,456,817.4859
Angular separation (arcsec)
0.42800
Eq. Temperature
—
Insolation (S⊕)
15.30
Earth = 1.00
Earth Similarity (ESI)
0.744
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
Crossfield et al. 2016Instrument
Kepler CCD Array
Publication
2016-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-48
Spectral Class
K-type orange
Effective Temperature
4,899 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.730 R☉
Stellar Mass
0.770 M☉
Metallicity [Fe/H]
-0.19
Extended Stellar Properties
Surface gravity (log g)
4.603 dex
Stellar density
2.693 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.158 mas
Total Proper Motion
51.177 mas/yr
PM Right Ascension
-50.08 mas/yr
PM Declination
-10.53 mas/yr
Galactic Cartesian (pc)
x = -0.996 · y = 0.067 · z = 0.057
Equatorial (J2000)
RA 176.12331° · Dec 3.27238°
Galactic ℓ, b
266.193° · 61.274°
Ecliptic λ, β
175.139° · 1.463°
HTM-20 index
-173796581
Similar Worlds
HD 15906 b
Sub-Neptune · K-type orange
Radius 2.24 R⊕ · 148.6 ly
Kepler-196 c
Sub-Neptune · K-type orange
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HD 207496 b
Sub-Neptune · K-type orange
Radius 2.25 R⊕ · 77.0 ly
K2-17 b
Sub-Neptune · K-type orange
Radius 2.23 R⊕ · 408.0 ly
Kepler-567 b
Sub-Neptune · K-type orange
Radius 2.25 R⊕ · 1,822.6 ly
K2-268 f
Sub-Neptune · K-type orange
Radius 2.23 R⊕ · 1,069.1 ly