Key parameters at a glance
- A radius of 1.63 Earth radii
- A mass of 3.29 Earth masses
- Surface gravity around 1.24 g
- An orbital period of 2.617 days
- Semi-major axis 0.0331 AU
- Equilibrium temperature 996 K (723 °C)
- Distance from Earth 2,109.14 light-years
- Earth Similarity Index 0.292
- Travel time at Voyager 1 speed 37,194,739 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-866 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#517of 1176
top 43.9%
This planet
1.63R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-866 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.63 | 11.21 |
| Mass (M⊕) | 1.00 | 3.29 | 317.83 |
| Density (g/cm³) | 5.51 | 4.17 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 196.13 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159307214
Gaia DR2
Gaia DR2 2102794517586604288
Gaia DR3
Gaia DR3 2102794517586604288
System
Kepler-866
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.62 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0331 AU.
Transit Fingerprint
Depth
0.050 %
Duration
2.045 h
Impact parameter b
0.146
Rp / R★
0.020934
Transit midpoint (BJD)
2,454,967.0318
Photometric dip
Transit produces a flux drop of 499 ppm lasting ≈ 2.05 h.
Extended Orbital Architecture
Planet / star radius ratio
0.020934
Semi-major axis / stellar radius
9.880
Impact parameter (b)
0.146
Transit mid-time (BJD)
2,454,967.0318
Angular separation (arcsec)
0.05120
Eq. Temperature
996K
(723 °C)
Insolation (S⊕)
196.13
Earth = 1.00
Earth Similarity (ESI)
0.292
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-866
Spectral Class
K-type orange
Effective Temperature
4,751 K — cooler than the Sun (5,778 K)
Estimated Age
4.27 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.710 R☉
Stellar Mass
0.750 M☉
Metallicity [Fe/H]
-0.07
Extended Stellar Properties
Surface gravity (log g)
4.620 dex
Stellar density
2.665 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.519 mas
Total Proper Motion
34.947 mas/yr
PM Right Ascension
-16.77 mas/yr
PM Declination
-30.66 mas/yr
Galactic Cartesian (pc)
x = 0.251 · y = -0.686 · z = 0.683
Equatorial (J2000)
RA 290.12221° · Dec 43.08541°
Galactic ℓ, b
74.832° · 13.256°
Ecliptic λ, β
305.099° · 64.092°
HTM-20 index
1070842390
Similar Worlds
Kepler-658 b
Super-Earth · K-type orange
Radius 1.63 R⊕ · 1,266.7 ly
K2-254 b
Super-Earth · K-type orange
Radius 1.63 R⊕ · 742.9 ly
Kepler-202 b
Super-Earth · K-type orange
Radius 1.63 R⊕ · 929.9 ly
Kepler-1873 b
Super-Earth · K-type orange
Radius 1.63 R⊕ · 2,677.6 ly
Kepler-247 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 2,164.7 ly
Kepler-441 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 874.1 ly