Key parameters at a glance
- A radius of 2.41 Earth radii
- A mass of 6.39 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 20.692 days
- Semi-major axis 0.1354 AU
- Distance from Earth 1,015.37 light-years
- Earth Similarity Index 0.717
- Travel time at Voyager 1 speed 17,905,979 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around K2-59
K2-59 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| K2-59 c | Sub-Neptune | 2.30 | 5.90 | 11.295 | — | 2016 |
| K2-59 b this | Sub-Neptune | 2.41 | 6.39 | 20.692 | — | 2016 |
K2-59 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1312of 1978
top 66.3%
This planet
2.41R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-59 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.41 | 11.21 |
| Mass (M⊕) | 1.00 | 6.39 | 317.83 |
| Density (g/cm³) | 5.51 | 2.51 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 17.10 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 188570847
Gaia DR2
Gaia DR2 2597903091739512320
Gaia DR3
Gaia DR3 2597903091739512320
System
K2-59
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 20.69 Earth days (5.7% of a terrestrial year) at a mean orbital distance of 0.1354 AU.
Transit Fingerprint
Depth
0.099 %
Duration
2.760 h
Impact parameter b
0.680
Rp / R★
0.029900
Transit midpoint (BJD)
2,456,987.0603
Photometric dip
Transit produces a flux drop of 986 ppm lasting ≈ 2.76 h.
Extended Orbital Architecture
Planet / star radius ratio
0.029900
Semi-major axis / stellar radius
63.000
Impact parameter (b)
0.680
Transit mid-time (BJD)
2,456,987.0603
Angular separation (arcsec)
0.43500
Eq. Temperature
—
Insolation (S⊕)
17.10
Earth = 1.00
Earth Similarity (ESI)
0.717
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: K2-59
Spectral Class
K-type orange
Effective Temperature
5,055 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.731 R☉
Stellar Mass
0.774 M☉
Metallicity [Fe/H]
—
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
3.184 mas
Total Proper Motion
44.744 mas/yr
PM Right Ascension
44.50 mas/yr
PM Declination
4.63 mas/yr
Galactic Cartesian (pc)
x = 0.905 · y = -0.349 · z = -0.242
Equatorial (J2000)
RA 338.94255° · Dec -14.02773°
Galactic ℓ, b
48.555° · -55.798°
Ecliptic λ, β
335.306° · -4.803°
HTM-20 index
-361864006
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