Key parameters at a glance
- A radius of 2.26 Earth radii
- A mass of 5.73 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 11.023 days
- Semi-major axis 0.0794 AU
- Equilibrium temperature 429 K (156 °C)
- Distance from Earth 426.11 light-years
- Earth Similarity Index 0.588
- Travel time at Voyager 1 speed 7,514,388 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-568 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1572of 1978
top 79.4%
This planet
2.26R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-568 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.26 | 11.21 |
| Mass (M⊕) | 1.00 | 5.73 | 317.83 |
| Density (g/cm³) | 5.51 | 2.73 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.37 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 28361088
Gaia DR2
Gaia DR2 2086543048537237760
Gaia DR3
Gaia DR3 2086543048537237760
System
Kepler-568
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.02 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0794 AU.
Transit Fingerprint
Depth
0.184 %
Duration
1.421 h
Impact parameter b
0.907
Rp / R★
0.038660
Transit midpoint (BJD)
2,455,004.1148
Photometric dip
Transit produces a flux drop of 1,842 ppm lasting ≈ 1.42 h.
Extended Orbital Architecture
Planet / star radius ratio
0.038660
Semi-major axis / stellar radius
61.270
Impact parameter (b)
0.907
Transit mid-time (BJD)
2,455,004.1148
Angular separation (arcsec)
0.60800
Eq. Temperature
429K
(156 °C)
Insolation (S⊕)
8.37
Earth = 1.00
Earth Similarity (ESI)
0.588
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-568
Spectral Class
K-type orange
Effective Temperature
3,768 K — cooler than the Sun (5,778 K)
Estimated Age
5.89 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.530 R☉
Stellar Mass
0.550 M☉
Metallicity [Fe/H]
0.11
Extended Stellar Properties
Surface gravity (log g)
4.730 dex
Stellar density
4.735 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
7.626 mas
Total Proper Motion
121.394 mas/yr
PM Right Ascension
57.95 mas/yr
PM Declination
106.67 mas/yr
Galactic Cartesian (pc)
x = 0.313 · y = -0.586 · z = 0.748
Equatorial (J2000)
RA 298.10613° · Dec 48.40164°
Galactic ℓ, b
82.250° · 10.697°
Ecliptic λ, β
322.516° · 66.788°
HTM-20 index
2075510546
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