Key parameters at a glance
- A radius of 1.28 Earth radii
- A mass of 2.18 Earth masses
- Surface gravity around 1.33 g
- An orbital period of 12.439 days
- Semi-major axis 0.0976 AU
- Equilibrium temperature 627 K (354 °C)
- Distance from Earth 921.60 light-years
- Earth Similarity Index 0.500
- Travel time at Voyager 1 speed 16,252,463 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1008 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#1117of 1176
top 94.9%
This planet
1.28R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-1008 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.28 | 11.21 |
| Mass (M⊕) | 1.00 | 2.18 | 317.83 |
| Density (g/cm³) | 5.51 | 5.71 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.33 | 2.53 |
| Insolation (S⊕) | 1.00 | 35.41 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 272491981
Gaia DR2
Gaia DR2 2079733154550359424
Gaia DR3
Gaia DR3 2079733154550359424
System
Kepler-1008
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 12.44 Earth days (3.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0975 AU.
Transit Fingerprint
Depth
0.028 %
Duration
3.121 h
Impact parameter b
0.830
Rp / R★
0.014991
Transit midpoint (BJD)
2,454,969.3778
Photometric dip
Transit produces a flux drop of 282 ppm lasting ≈ 3.12 h.
Extended Orbital Architecture
Planet / star radius ratio
0.014991
Semi-major axis / stellar radius
30.711
Impact parameter (b)
0.830
Transit mid-time (BJD)
2,454,969.3778
Angular separation (arcsec)
0.34500
Eq. Temperature
627K
(354 °C)
Insolation (S⊕)
35.41
Earth = 1.00
Earth Similarity (ESI)
0.500
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
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-1008
Spectral Class
K-type orange
Effective Temperature
5,066 K — cooler than the Sun (5,778 K)
Estimated Age
6.76 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.780 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.560 dex
Stellar density
1.970 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.510 mas
Total Proper Motion
23.099 mas/yr
PM Right Ascension
14.48 mas/yr
PM Declination
-18.00 mas/yr
Galactic Cartesian (pc)
x = 0.316 · y = -0.633 · z = 0.706
Equatorial (J2000)
RA 296.54764° · Dec 44.94183°
Galactic ℓ, b
78.645° · 9.964°
Ecliptic λ, β
316.520° · 64.154°
HTM-20 index
-1992198870
Similar Worlds
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