Key parameters at a glance
- A radius of 1.53 Earth radii
- A mass of 2.96 Earth masses
- Surface gravity around 1.26 g
- An orbital period of 1.312 days
- Semi-major axis 0.0234 AU
- Equilibrium temperature 1,562 K (1289 °C)
- Distance from Earth 1,615.64 light-years
- Earth Similarity Index 0.179
- Travel time at Voyager 1 speed 28,491,807 years
2 siblings around Kepler-198
Kepler-198 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-198 d this | Super-Earth | 1.53 | 2.96 | 1.312 | 1,562 | 2016 |
| Kepler-198 b | Sub-Neptune | 2.82 | 8.35 | 17.790 | 655 | 2014 |
| Kepler-198 c | Sub-Neptune | 2.47 | 6.66 | 49.567 | 465 | 2014 |
Kepler-198 d Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#687of 1176
top 58.3%
This planet
1.53R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-198 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.53 | 11.21 |
| Mass (M⊕) | 1.00 | 2.96 | 317.83 |
| Density (g/cm³) | 5.51 | 4.54 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.26 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,444.52 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122519154
Gaia DR2
Gaia DR2 2052852912747829760
Gaia DR3
Gaia DR3 2052852912747829760
System
Kepler-198
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.31 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0234 AU.
Transit Fingerprint
Depth
0.026 %
Duration
1.773 h
Impact parameter b
0.380
Rp / R★
0.014782
Transit midpoint (BJD)
2,454,966.1092
Photometric dip
Transit produces a flux drop of 263 ppm lasting ≈ 1.77 h.
Extended Orbital Architecture
Planet / star radius ratio
0.014782
Semi-major axis / stellar radius
5.725
Impact parameter (b)
0.380
Transit mid-time (BJD)
2,454,966.1092
Angular separation (arcsec)
0.04730
Eq. Temperature
1,562K
(1289 °C)
Insolation (S⊕)
1,444.52
Earth = 1.00
Earth Similarity (ESI)
0.179
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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-198
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,636 K — cooler than the Sun (5,778 K)
Estimated Age
3.72 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.930 R☉
Stellar Mass
0.970 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.490 dex
Stellar density
1.370 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
1.990 mas
Total Proper Motion
2.583 mas/yr
PM Right Ascension
-1.68 mas/yr
PM Declination
1.96 mas/yr
Galactic Cartesian (pc)
x = 0.276 · y = -0.730 · z = 0.625
Equatorial (J2000)
RA 290.67313° · Dec 38.69100°
Galactic ℓ, b
70.959° · 10.988°
Ecliptic λ, β
303.180° · 59.771°
HTM-20 index
1935567964
Similar Worlds
Kepler-990 c
Super-Earth · G-type yellow (Sun-like)
Radius 1.53 R⊕ · 2,616.3 ly
Kepler-825 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.53 R⊕ · 2,634.9 ly
TOI-5788 b
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Radius 1.53 R⊕ · 318.4 ly
Kepler-1950 b
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Radius 1.53 R⊕ · 2,274.1 ly
Kepler-107 b
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HIP 29442 d
Super-Earth · G-type yellow (Sun-like)
Radius 1.54 R⊕ · 222.4 ly