Key parameters at a glance
- A radius of 2.50 Earth radii
- A mass of 6.80 Earth masses
- Surface gravity around 1.09 g
- An orbital period of 17.672 days
- Semi-major axis 0.1204 AU
- Equilibrium temperature 513 K (240 °C)
- Distance from Earth 2,356.93 light-years
- Earth Similarity Index 0.485
- Travel time at Voyager 1 speed 41,564,524 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-659 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1168of 1978
top 59.0%
This planet
2.50R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-659 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.50 | 11.21 |
| Mass (M⊕) | 1.00 | 6.80 | 317.83 |
| Density (g/cm³) | 5.51 | 2.39 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.09 | 2.53 |
| Insolation (S⊕) | 1.00 | 21.31 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158489787
Gaia DR2
Gaia DR2 2130866904868424320
Gaia DR3
Gaia DR3 2130866904868424320
System
Kepler-659
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.67 Earth days (4.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1204 AU.
Transit Fingerprint
Depth
0.092 %
Duration
3.255 h
Impact parameter b
0.668
Rp / R★
0.030615
Transit midpoint (BJD)
2,455,019.3686
Photometric dip
Transit produces a flux drop of 919 ppm lasting ≈ 3.26 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030615
Semi-major axis / stellar radius
22.600
Impact parameter (b)
0.668
Transit mid-time (BJD)
2,455,019.3686
Angular separation (arcsec)
0.16700
Eq. Temperature
513K
(240 °C)
Insolation (S⊕)
21.31
Earth = 1.00
Earth Similarity (ESI)
0.485
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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-659
Spectral Class
K-type orange
Effective Temperature
4,870 K — cooler than the Sun (5,778 K)
Estimated Age
3.24 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.740 R☉
Stellar Mass
0.790 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.600 dex
Stellar density
2.089 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.355 mas
Total Proper Motion
4.737 mas/yr
PM Right Ascension
-4.50 mas/yr
PM Declination
-1.47 mas/yr
Galactic Cartesian (pc)
x = 0.204 · y = -0.644 · z = 0.737
Equatorial (J2000)
RA 287.60818° · Dec 47.50969°
Galactic ℓ, b
78.296° · 16.647°
Ecliptic λ, β
304.490° · 68.850°
HTM-20 index
-1845945324
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