Key parameters at a glance
- A radius of 1.89 Earth radii
- A mass of 4.23 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 31.637 days
- Semi-major axis 0.1779 AU
- Distance from Earth 1,141.16 light-years
- Earth Similarity Index 0.806
- Travel time at Voyager 1 speed 20,124,318 years
- Almost certainly tidally locked to its host star given the close orbit
K2-47 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#143of 1176
top 12.1%
This planet
1.89R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | K2-47 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.89 | 11.21 |
| Mass (M⊕) | 1.00 | 4.23 | 317.83 |
| Density (g/cm³) | 5.51 | 3.44 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 10.70 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 301603728
Gaia DR2
Gaia DR2 3811760011794444928
Gaia DR3
Gaia DR3 3811760011794444928
System
K2-47
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 31.64 Earth days (8.7% of a terrestrial year) at a mean orbital distance of 0.1779 AU.
Transit Fingerprint
Depth
0.100 %
Duration
4.000 h
Impact parameter b
0.120
Rp / R★
0.022900
Transit midpoint (BJD)
2,456,825.7030
Photometric dip
Transit produces a flux drop of 999 ppm lasting ≈ 4.00 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022900
Semi-major axis / stellar radius
46.800
Impact parameter (b)
0.120
Transit mid-time (BJD)
2,456,825.7030
Angular separation (arcsec)
0.50800
Eq. Temperature
—
Insolation (S⊕)
10.70
Earth = 1.00
Earth Similarity (ESI)
0.806
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: K2-47
Spectral Class
K-type orange
Effective Temperature
5,054 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.760 R☉
Stellar Mass
0.750 M☉
Metallicity [Fe/H]
-0.22
Extended Stellar Properties
Surface gravity (log g)
4.544 dex
Stellar density
2.041 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
2.830 mas
Total Proper Motion
33.401 mas/yr
PM Right Ascension
-8.49 mas/yr
PM Declination
-32.30 mas/yr
Galactic Cartesian (pc)
x = -0.979 · y = 0.198 · z = 0.049
Equatorial (J2000)
RA 168.58257° · Dec 2.78056°
Galactic ℓ, b
255.104° · 56.351°
Ecliptic λ, β
168.411° · -1.957°
HTM-20 index
268809546
Similar Worlds
Kepler-1221 b
Super-Earth · K-type orange
Radius 1.88 R⊕ · 2,979.9 ly
Kepler-48 b
Super-Earth · K-type orange
Radius 1.88 R⊕ · 1,000.4 ly
K2-155 d
Super-Earth · K-type orange
Radius 1.90 R⊕ · 237.4 ly
TOI-286 c
Super-Earth · K-type orange
Radius 1.88 R⊕ · 193.2 ly
Kepler-158 c
Super-Earth · K-type orange
Radius 1.90 R⊕ · 1,028.0 ly
Kepler-601 b
Super-Earth · K-type orange
Radius 1.90 R⊕ · 1,353.0 ly