Key parameters at a glance
- A radius of 1.39 Earth radii
- A mass of 2.51 Earth masses
- Surface gravity around 1.30 g
- An orbital period of 7.467 days
- Semi-major axis 0.0790 AU
- Equilibrium temperature 1,141 K (868 °C)
- Distance from Earth 2,528.78 light-years
- Earth Similarity Index 0.264
- Travel time at Voyager 1 speed 44,595,012 years
3 siblings around Kepler-208
Kepler-208 c shares its host star with 3 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-208 b | Super-Earth | 1.63 | 3.29 | 4.229 | 1,379 | 2014 |
| Kepler-208 c this | Super-Earth | 1.39 | 2.51 | 7.467 | 1,141 | 2014 |
| Kepler-208 d | Rocky Terrestrial | 1.20 | 1.87 | 11.132 | 999 | 2014 |
| Kepler-208 e | Super-Earth | 1.48 | 2.79 | 16.259 | 880 | 2014 |
Kepler-208 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#940of 1176
top 79.8%
This planet
1.39R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-208 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.39 | 11.21 |
| Mass (M⊕) | 1.00 | 2.51 | 317.83 |
| Density (g/cm³) | 5.51 | 5.14 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.30 | 2.53 |
| Insolation (S⊕) | 1.00 | 300.17 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270781284
Gaia DR2
Gaia DR2 2077750803804146176
Gaia DR3
Gaia DR3 2077750803804146176
System
Kepler-208
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.47 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0790 AU.
Transit Fingerprint
Depth
0.012 %
Duration
3.882 h
Impact parameter b
0.270
Rp / R★
0.010288
Transit midpoint (BJD)
2,454,965.7738
Photometric dip
Transit produces a flux drop of 121 ppm lasting ≈ 3.88 h.
Extended Orbital Architecture
Planet / star radius ratio
0.010288
Semi-major axis / stellar radius
8.390
Impact parameter (b)
0.270
Transit mid-time (BJD)
2,454,965.7738
Angular separation (arcsec)
0.10200
Eq. Temperature
1,141K
(868 °C)
Insolation (S⊕)
300.17
Earth = 1.00
Earth Similarity (ESI)
0.264
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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-208
Spectral Class
F-type yellow-white
Effective Temperature
6,092 K — hotter than the Sun (5,778 K)
Estimated Age
4.68 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.314 R☉
Stellar Mass
1.082 M☉
Metallicity [Fe/H]
-0.04
Extended Stellar Properties
Surface gravity (log g)
4.265 dex
Stellar density
0.590 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
1.261 mas
Total Proper Motion
8.794 mas/yr
PM Right Ascension
0.33 mas/yr
PM Declination
-8.79 mas/yr
Galactic Cartesian (pc)
x = 0.298 · y = -0.674 · z = 0.676
Equatorial (J2000)
RA 293.89020° · Dec 42.52794°
Galactic ℓ, b
75.564° · 10.529°
Ecliptic λ, β
310.505° · 62.648°
HTM-20 index
-869338612
Similar Worlds
Kepler-1394 b
Super-Earth · F-type yellow-white
Radius 1.39 R⊕ · 2,088.7 ly
Kepler-323 b
Super-Earth · F-type yellow-white
Radius 1.38 R⊕ · 1,483.6 ly
Kepler-127 b
Super-Earth · F-type yellow-white
Radius 1.40 R⊕ · 1,150.7 ly
Kepler-84 d
Super-Earth · F-type yellow-white
Radius 1.38 R⊕ · 3,339.5 ly
Kepler-402 d
Super-Earth · F-type yellow-white
Radius 1.38 R⊕ · 2,039.6 ly
Kepler-1921 c
Super-Earth · F-type yellow-white
Radius 1.41 R⊕ · 3,030.0 ly