Key parameters at a glance
- A radius of 1.93 Earth radii
- A mass of 4.38 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 22.929 days
- Semi-major axis 0.1360 AU
- Equilibrium temperature 416 K (143 °C)
- Distance from Earth 1,690.15 light-years
- Earth Similarity Index 0.639
- Travel time at Voyager 1 speed 29,805,854 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around Kepler-298
Kepler-298 c 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-298 b | Super-Earth | 1.96 | 4.50 | 10.475 | 540 | 2014 |
| Kepler-298 c this | Super-Earth | 1.93 | 4.38 | 22.929 | 416 | 2014 |
| Kepler-298 d | Sub-Neptune | 2.50 | 6.80 | 77.474 | 277 | 2014 |
Kepler-298 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#85of 1176
top 7.1%
This planet
1.93R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-298 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.93 | 11.21 |
| Mass (M⊕) | 1.00 | 4.38 | 317.83 |
| Density (g/cm³) | 5.51 | 3.35 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.70 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 48217868
Gaia DR2
Gaia DR2 2143758128946411904
Gaia DR3
Gaia DR3 2143758128946411904
System
Kepler-298
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 22.93 Earth days (6.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1360 AU.
Transit Fingerprint
Depth
0.091 %
Duration
2.398 h
Impact parameter b
0.590
Rp / R★
0.031170
Transit midpoint (BJD)
2,455,156.0337
Photometric dip
Transit produces a flux drop of 909 ppm lasting ≈ 2.40 h.
Extended Orbital Architecture
Planet / star radius ratio
0.031170
Semi-major axis / stellar radius
42.000
Impact parameter (b)
0.590
Transit mid-time (BJD)
2,455,156.0337
Angular separation (arcsec)
0.26200
Eq. Temperature
416K
(143 °C)
Insolation (S⊕)
8.70
Earth = 1.00
Earth Similarity (ESI)
0.639
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
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-298
Spectral Class
K-type orange
Effective Temperature
4,465 K — cooler than the Sun (5,778 K)
Estimated Age
2.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.582 R☉
Stellar Mass
0.660 M☉
Metallicity [Fe/H]
-0.21
Extended Stellar Properties
Surface gravity (log g)
4.709 dex
Stellar density
6.832 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.901 mas
Total Proper Motion
10.336 mas/yr
PM Right Ascension
6.29 mas/yr
PM Declination
-8.20 mas/yr
Galactic Cartesian (pc)
x = 0.149 · y = -0.641 · z = 0.753
Equatorial (J2000)
RA 283.03984° · Dec 48.82533°
Galactic ℓ, b
78.470° · 19.961°
Ecliptic λ, β
297.195° · 71.036°
HTM-20 index
1908993741
Similar Worlds
K2-49 b
Super-Earth · K-type orange
Radius 1.93 R⊕ · 1,490.9 ly
Kepler-329 c
Super-Earth · K-type orange
Radius 1.93 R⊕ · 1,434.2 ly
Kepler-878 b
Super-Earth · K-type orange
Radius 1.93 R⊕ · 2,581.9 ly
K2-35 c
Super-Earth · K-type orange
Radius 1.93 R⊕ · 823.9 ly
K2-414 c
Super-Earth · K-type orange
Radius 1.93 R⊕ · 848.1 ly
K2-339 b
Super-Earth · K-type orange
Radius 1.92 R⊕ · 1,175.3 ly