Key parameters at a glance
- A radius of 1.63 Earth radii
- A mass of 3.29 Earth masses
- Surface gravity around 1.24 g
- An orbital period of 4.229 days
- Semi-major axis 0.0540 AU
- Equilibrium temperature 1,379 K (1106 °C)
- Distance from Earth 2,528.78 light-years
- Earth Similarity Index 0.203
- Travel time at Voyager 1 speed 44,595,012 years
3 siblings around Kepler-208
Kepler-208 b 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 this | Super-Earth | 1.63 | 3.29 | 4.229 | 1,379 | 2014 |
| Kepler-208 c | 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 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#517of 1176
top 43.9%
This planet
1.63R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-208 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.63 | 11.21 |
| Mass (M⊕) | 1.00 | 3.29 | 317.83 |
| Density (g/cm³) | 5.51 | 4.17 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 639.58 | 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 4.23 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0540 AU.
Transit Fingerprint
Depth
0.015 %
Duration
3.308 h
Impact parameter b
0.160
Rp / R★
0.011551
Transit midpoint (BJD)
2,455,003.7420
Photometric dip
Transit produces a flux drop of 150 ppm lasting ≈ 3.31 h.
Extended Orbital Architecture
Planet / star radius ratio
0.011551
Semi-major axis / stellar radius
9.739
Impact parameter (b)
0.160
Transit mid-time (BJD)
2,455,003.7420
Angular separation (arcsec)
0.06960
Eq. Temperature
1,379K
(1106 °C)
Insolation (S⊕)
639.58
Earth = 1.00
Earth Similarity (ESI)
0.203
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-1900 b
Super-Earth · F-type yellow-white
Radius 1.62 R⊕ · 5,024.2 ly
Kepler-21 b
Super-Earth · F-type yellow-white
Radius 1.64 R⊕ · 354.0 ly
Kepler-750 c
Super-Earth · F-type yellow-white
Radius 1.62 R⊕ · 4,227.0 ly
Kepler-864 c
Super-Earth · F-type yellow-white
Radius 1.62 R⊕ · 6,597.8 ly
Kepler-508 b
Super-Earth · F-type yellow-white
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Kepler-1428 b
Super-Earth · F-type yellow-white
Radius 1.64 R⊕ · 4,991.2 ly