Key parameters at a glance
- A radius of 3.09 Earth radii
- A mass of 9.75 Earth masses
- Surface gravity around 1.02 g
- An orbital period of 20.382 days
- Semi-major axis 0.1316 AU
- Equilibrium temperature 528 K (255 °C)
- Distance from Earth 2,739.39 light-years
- Earth Similarity Index 0.435
- Travel time at Voyager 1 speed 48,309,211 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-859 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#443of 1978
top 22.3%
This planet
3.09R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-859 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.09 | 11.21 |
| Mass (M⊕) | 1.00 | 9.75 | 317.83 |
| Density (g/cm³) | 5.51 | 1.82 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.02 | 2.53 |
| Insolation (S⊕) | 1.00 | 14.90 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158317824
Gaia DR2
Gaia DR2 2105604800586437760
Gaia DR3
Gaia DR3 2105604800586437760
System
Kepler-859
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 20.38 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1316 AU.
Transit Fingerprint
Depth
0.160 %
Duration
3.743 h
Impact parameter b
0.520
Rp / R★
0.036746
Transit midpoint (BJD)
2,454,975.3145
Photometric dip
Transit produces a flux drop of 1,597 ppm lasting ≈ 3.74 h.
Extended Orbital Architecture
Planet / star radius ratio
0.036746
Semi-major axis / stellar radius
43.130
Impact parameter (b)
0.520
Transit mid-time (BJD)
2,454,975.3145
Angular separation (arcsec)
0.15700
Eq. Temperature
528K
(255 °C)
Insolation (S⊕)
14.90
Earth = 1.00
Earth Similarity (ESI)
0.435
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-859
Spectral Class
K-type orange
Effective Temperature
5,020 K — cooler than the Sun (5,778 K)
Estimated Age
4.57 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.770 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
2.110 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.163 mas
Total Proper Motion
5.556 mas/yr
PM Right Ascension
-2.24 mas/yr
PM Declination
5.09 mas/yr
Galactic Cartesian (pc)
x = 0.210 · y = -0.698 · z = 0.684
Equatorial (J2000)
RA 286.74183° · Dec 43.19012°
Galactic ℓ, b
73.901° · 15.554°
Ecliptic λ, β
299.688° · 64.913°
HTM-20 index
1139245872
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