Key parameters at a glance
- A radius of 1.20 Earth radii
- A mass of 1.87 Earth masses
- Surface gravity around 1.30 g
- An orbital period of 11.132 days
- Semi-major axis 0.1030 AU
- Equilibrium temperature 999 K (726 °C)
- Distance from Earth 2,528.78 light-years
- Earth Similarity Index 0.312
- Travel time at Voyager 1 speed 44,595,012 years
3 siblings around Kepler-208
Kepler-208 d 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 | Super-Earth | 1.39 | 2.51 | 7.467 | 1,141 | 2014 |
| Kepler-208 d this | 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 d Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#75of 570
top 13.0%
This planet
1.20R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-208 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.20 | 11.21 |
| Mass (M⊕) | 1.00 | 1.87 | 317.83 |
| Density (g/cm³) | 5.51 | 5.95 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.30 | 2.53 |
| Insolation (S⊕) | 1.00 | 176.28 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 270781284
Gaia DR2
Gaia DR2 2077750803804146176
Gaia DR3
Gaia DR3 2077750803804146176
System
Kepler-208
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.13 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1030 AU.
Transit Fingerprint
Depth
0.010 %
Duration
4.118 h
Impact parameter b
0.110
Rp / R★
0.008915
Transit midpoint (BJD)
2,454,956.2954
Photometric dip
Transit produces a flux drop of 96 ppm lasting ≈ 4.12 h.
Extended Orbital Architecture
Planet / star radius ratio
0.008915
Semi-major axis / stellar radius
11.000
Impact parameter (b)
0.110
Transit mid-time (BJD)
2,454,956.2954
Angular separation (arcsec)
0.13300
Eq. Temperature
999K
(726 °C)
Insolation (S⊕)
176.28
Earth = 1.00
Earth Similarity (ESI)
0.312
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-1617 b
Rocky Terrestrial · F-type yellow-white
Radius 1.20 R⊕ · 2,929.9 ly
Kepler-907 b
Rocky Terrestrial · F-type yellow-white
Radius 1.20 R⊕ · 1,148.1 ly
Kepler-1213 b
Rocky Terrestrial · F-type yellow-white
Radius 1.19 R⊕ · 2,634.7 ly
Kepler-1276 b
Rocky Terrestrial · F-type yellow-white
Radius 1.19 R⊕ · 1,756.3 ly
Kepler-1473 b
Rocky Terrestrial · F-type yellow-white
Radius 1.19 R⊕ · 2,127.4 ly
KOI-351 c
Rocky Terrestrial · F-type yellow-white
Radius 1.19 R⊕ · 2,766.6 ly