Key parameters at a glance
- A radius of 1.99 Earth radii
- A mass of 3.55 Earth masses
- Surface gravity around 0.90 g
- An orbital period of 1.542 days
- Semi-major axis 0.0261 AU
- Equilibrium temperature 1,592 K (1319 °C)
- Distance from Earth 1,142.57 light-years
- Earth Similarity Index 0.152
- Travel time at Voyager 1 speed 20,149,281 years
Kepler-98 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#4of 1176
top 0.3%
This planet
1.99R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-98 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.99 | 11.21 |
| Mass (M⊕) | 1.00 | 3.55 | 317.83 |
| Density (g/cm³) | 5.51 | 2.18 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.90 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,107.39 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3.550 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 2.072 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 120629799
Gaia DR2
Gaia DR2 2099862910348755712
Gaia DR3
Gaia DR3 2099862910348755712
System
Kepler-98
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.54 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0261 AU.
Transit Fingerprint
Depth
0.030 %
Duration
1.987 h
Impact parameter b
0.560
Rp / R★
0.016377
Transit midpoint (BJD)
2,455,003.5433
Photometric dip
Transit produces a flux drop of 297 ppm lasting ≈ 1.99 h.
Extended Orbital Architecture
Planet / star radius ratio
0.016377
Semi-major axis / stellar radius
5.100
Impact parameter (b)
0.560
RV semi-amplitude (K)
1.820 m/s
Transit mid-time (BJD)
2,455,003.5433
Angular separation (arcsec)
0.07460
Eq. Temperature
1,592K
(1319 °C)
Insolation (S⊕)
1,107.39
Earth = 1.00
Earth Similarity (ESI)
0.152
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Marcy et al. 2014Instrument
Kepler CCD Array
Publication
2014-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-98
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,539 K — cooler than the Sun (5,778 K)
Estimated Age
2.79 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.110 R☉
Stellar Mass
0.990 M☉
Metallicity [Fe/H]
0.18
Extended Stellar Properties
Surface gravity (log g)
4.341 dex
Stellar density
1.120 g/cm³
Systemic radial velocity
-30.98 km/s
Rotational v·sin i
0.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.826 mas
Total Proper Motion
17.989 mas/yr
PM Right Ascension
8.86 mas/yr
PM Declination
15.66 mas/yr
Galactic Cartesian (pc)
x = 0.213 · y = -0.759 · z = 0.615
Equatorial (J2000)
RA 285.66169° · Dec 37.96457°
Galactic ℓ, b
68.595° · 14.253°
Ecliptic λ, β
295.221° · 60.040°
HTM-20 index
642639897
Similar Worlds
Kepler-1144 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.99 R⊕ · 3,720.0 ly
Kepler-181 c
Super-Earth · G-type yellow (Sun-like)
Radius 1.99 R⊕ · 1,987.2 ly
Kepler-1457 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.99 R⊕ · 2,902.4 ly
Kepler-142 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.99 R⊕ · 1,789.6 ly
Kepler-625 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.99 R⊕ · 2,481.1 ly
Kepler-526 b
Super-Earth · G-type yellow (Sun-like)
Radius 1.99 R⊕ · 2,172.7 ly