Key parameters at a glance
- A radius of 3.02 Earth radii
- A mass of 9.40 Earth masses
- Surface gravity around 1.03 g
- An orbital period of 86.495 days
- Semi-major axis 0.3667 AU
- Equilibrium temperature 367 K (94 °C)
- Distance from Earth 2,221.40 light-years
- Earth Similarity Index 0.596
- Travel time at Voyager 1 speed 39,174,437 years
1 sibling around Kepler-598
Kepler-598 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-598 b | Super-Earth | 1.50 | 2.86 | 3.702 | 1,050 | 2016 |
| Kepler-598 c this | Sub-Neptune | 3.02 | 9.40 | 86.495 | 367 | 2020 |
Kepler-598 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#500of 1978
top 25.2%
This planet
3.02R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-598 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.02 | 11.21 |
| Mass (M⊕) | 1.00 | 9.40 | 317.83 |
| Density (g/cm³) | 5.51 | 1.87 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.03 | 2.53 |
| Insolation (S⊕) | 1.00 | 3.70 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 137969066
Gaia DR2
Gaia DR2 2053546910744629504
Gaia DR3
Gaia DR3 2053546910744629504
System
Kepler-598
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 86.49 Earth days (23.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3667 AU.
Transit Fingerprint
Depth
0.105 %
Duration
7.284 h
Impact parameter b
0.020
Rp / R★
0.027210
Transit midpoint (BJD)
2,455,014.8897
Photometric dip
Transit produces a flux drop of 1,046 ppm lasting ≈ 7.28 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027210
Semi-major axis / stellar radius
91.600
Impact parameter (b)
0.020
Transit mid-time (BJD)
2,455,014.8897
Angular separation (arcsec)
0.53800
Eq. Temperature
367K
(94 °C)
Insolation (S⊕)
3.70
Earth = 1.00
Earth Similarity (ESI)
0.596
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
Discovery Paper
Primary reference
Armstrong et al. 2021Instrument
Kepler CCD Array
Publication
2021-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Kepler (12 shown).
Host System: Kepler-598
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,245 K — cooler than the Sun (5,778 K)
Estimated Age
12.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.900 R☉
Stellar Mass
0.900 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
4.484 dex
Stellar density
1.739 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.440 mas
Total Proper Motion
7.235 mas/yr
PM Right Ascension
3.57 mas/yr
PM Declination
6.29 mas/yr
Galactic Cartesian (pc)
x = 0.297 · y = -0.695 · z = 0.655
Equatorial (J2000)
RA 293.12345° · Dec 40.93480°
Galactic ℓ, b
73.857° · 10.309°
Ecliptic λ, β
308.211° · 61.342°
HTM-20 index
1938677140
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