Key parameters at a glance
- A radius of 2.15 Earth radii
- A mass of 5.27 Earth masses
- Surface gravity around 1.14 g
- An orbital period of 18.428 days
- Semi-major axis 0.1247 AU
- Equilibrium temperature 526 K (253 °C)
- Distance from Earth 1,840.42 light-years
- Earth Similarity Index 0.502
- Travel time at Voyager 1 speed 32,455,863 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-566 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1741of 1978
top 88.0%
This planet
2.15R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-566 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.15 | 11.21 |
| Mass (M⊕) | 1.00 | 5.27 | 317.83 |
| Density (g/cm³) | 5.51 | 2.91 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.14 | 2.53 |
| Insolation (S⊕) | 1.00 | 16.88 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159727092
Gaia DR2
Gaia DR2 2129241586165440768
Gaia DR3
Gaia DR3 2129241586165440768
System
Kepler-566
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 18.43 Earth days (5.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1247 AU.
Transit Fingerprint
Depth
0.071 %
Duration
2.870 h
Impact parameter b
0.287
Rp / R★
0.024611
Transit midpoint (BJD)
2,455,011.4405
Photometric dip
Transit produces a flux drop of 707 ppm lasting ≈ 2.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024611
Semi-major axis / stellar radius
48.250
Impact parameter (b)
0.287
Transit mid-time (BJD)
2,455,011.4405
Angular separation (arcsec)
0.22100
Eq. Temperature
526K
(253 °C)
Insolation (S⊕)
16.88
Earth = 1.00
Earth Similarity (ESI)
0.502
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-566
Spectral Class
K-type orange
Effective Temperature
5,132 K — cooler than the Sun (5,778 K)
Estimated Age
4.57 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.790 R☉
Stellar Mass
0.830 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.570 dex
Stellar density
6.258 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.744 mas
Total Proper Motion
5.610 mas/yr
PM Right Ascension
-1.65 mas/yr
PM Declination
-5.36 mas/yr
Galactic Cartesian (pc)
x = 0.247 · y = -0.625 · z = 0.741
Equatorial (J2000)
RA 291.55447° · Dec 47.81444°
Galactic ℓ, b
79.686° · 14.331°
Ecliptic λ, β
311.554° · 68.167°
HTM-20 index
-214228154
Similar Worlds
K2-42 b
Sub-Neptune · K-type orange
Radius 2.15 R⊕ · 1,294.6 ly
K2-71 b
Sub-Neptune · K-type orange
Radius 2.15 R⊕ · 499.6 ly
Kepler-61 b
Sub-Neptune · K-type orange
Radius 2.15 R⊕ · 1,092.9 ly
Kepler-1013 b
Sub-Neptune · K-type orange
Radius 2.15 R⊕ · 1,377.2 ly
Kepler-1455 b
Sub-Neptune · K-type orange
Radius 2.16 R⊕ · 1,166.4 ly
Kepler-437 b
Sub-Neptune · K-type orange
Radius 2.14 R⊕ · 991.5 ly