Key parameters at a glance
- A radius of 13.90 Earth radii
- A mass of 6,388.10 Earth masses
- Surface gravity around 33.06 g
- An orbital period of 21.087 days
- Semi-major axis 0.1640 AU
- Equilibrium temperature 897 K (624 °C)
- Distance from Earth 3,448.81 light-years
- Earth Similarity Index 0.157
- Travel time at Voyager 1 speed 60,819,693 years
Kepler-39 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#456of 1771
top 25.7%
This planet
13.90R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-39 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.90 | 11.21 |
| Mass (M⊕) | 1.00 | 6,388.10 | 317.83 |
| Density (g/cm³) | 5.51 | 13.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 33.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 90.22 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6,388.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 272836943
Gaia DR2
Gaia DR2 2080168561154800384
Gaia DR3
Gaia DR3 2080168561154800384
System
Kepler-39
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 21.09 Earth days (5.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1640 AU.
Transit Fingerprint
Depth
0.889 %
Duration
5.960 h
Impact parameter b
0.360
Rp / R★
0.091000
Transit midpoint (BJD)
2,455,942.6071
Photometric dip
Transit produces a flux drop of 8,895 ppm lasting ≈ 5.96 h.
Extended Orbital Architecture
Planet / star radius ratio
0.091000
Semi-major axis / stellar radius
24.920
Impact parameter (b)
0.360
RV semi-amplitude (K)
1,257.000 m/s
Transit mid-time (BJD)
2,455,942.6071
Long. of periastron (ω)
99.00°
Angular separation (arcsec)
0.15500
Eq. Temperature
897K
(624 °C)
Insolation (S⊕)
90.22
Earth = 1.00
Earth Similarity (ESI)
0.157
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Bouchy et al. 2011Instrument
Kepler CCD Array
Publication
2011-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2011 at Kepler (12 shown).
Host System: Kepler-39
Spectral Class
F-type yellow-white
Effective Temperature
6,350 K — hotter than the Sun (5,778 K)
Estimated Age
2.10 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.400 R☉
Stellar Mass
1.290 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.400 dex
Stellar density
0.660 g/cm³
Systemic radial velocity
-0.06 km/s
Rotational v·sin i
16.00 km/s
Rotation period
4.50 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.917 mas
Total Proper Motion
4.523 mas/yr
PM Right Ascension
3.89 mas/yr
PM Declination
-2.31 mas/yr
Galactic Cartesian (pc)
x = 0.315 · y = -0.619 · z = 0.720
Equatorial (J2000)
RA 296.96033° · Dec 46.03430°
Galactic ℓ, b
79.760° · 10.234°
Ecliptic λ, β
318.196° · 65.026°
HTM-20 index
-2092783648
Similar Worlds
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HD 179949 b
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HD 205158 b
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Kepler-65 e
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Radius 13.90 R⊕ · 990.6 ly
HD 13908 b
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HD 25171 b
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Radius 13.90 R⊕ · 181.4 ly