Key parameters at a glance
- A radius of 2.84 Earth radii
- A mass of 8.45 Earth masses
- Surface gravity around 1.05 g
- An orbital period of 15.656 days
- Semi-major axis 0.1128 AU
- Equilibrium temperature 623 K (350 °C)
- Distance from Earth 1,821.64 light-years
- Earth Similarity Index 0.386
- Travel time at Voyager 1 speed 32,124,562 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-599 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#694of 1978
top 35.0%
This planet
2.84R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-599 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.84 | 11.21 |
| Mass (M⊕) | 1.00 | 8.45 | 317.83 |
| Density (g/cm³) | 5.51 | 2.03 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.05 | 2.53 |
| Insolation (S⊕) | 1.00 | 24.47 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 120686620
Gaia DR2
Gaia DR2 2103794420332069632
Gaia DR3
Gaia DR3 2103794420332069632
System
Kepler-599
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 15.66 Earth days (4.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1128 AU.
Transit Fingerprint
Depth
0.096 %
Duration
4.108 h
Impact parameter b
0.780
Rp / R★
0.032524
Transit midpoint (BJD)
2,455,003.7836
Photometric dip
Transit produces a flux drop of 956 ppm lasting ≈ 4.11 h.
Extended Orbital Architecture
Planet / star radius ratio
0.032524
Semi-major axis / stellar radius
29.890
Impact parameter (b)
0.780
Transit mid-time (BJD)
2,455,003.7836
Angular separation (arcsec)
0.20200
Eq. Temperature
623K
(350 °C)
Insolation (S⊕)
24.47
Earth = 1.00
Earth Similarity (ESI)
0.386
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-599
Spectral Class
K-type orange
Effective Temperature
5,127 K — cooler than the Sun (5,778 K)
Estimated Age
5.01 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.790 R☉
Stellar Mass
0.830 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.570 dex
Stellar density
2.061 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.762 mas
Total Proper Motion
21.308 mas/yr
PM Right Ascension
11.65 mas/yr
PM Declination
17.84 mas/yr
Galactic Cartesian (pc)
x = 0.207 · y = -0.725 · z = 0.657
Equatorial (J2000)
RA 285.91160° · Dec 41.06951°
Galactic ℓ, b
71.626° · 15.298°
Ecliptic λ, β
297.098° · 63.020°
HTM-20 index
1700604685
Similar Worlds
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K2-199 c
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HD 3167 e
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HD 110067 d
Sub-Neptune · K-type orange
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