Key parameters at a glance
- A radius of 10.16 Earth radii
- A mass of 321.01 Earth masses
- Surface gravity around 3.11 g
- An orbital period of 16.339 days
- Semi-major axis 0.1349 AU
- Equilibrium temperature 963 K (690 °C)
- Distance from Earth 3,468.93 light-years
- Earth Similarity Index 0.176
- Travel time at Voyager 1 speed 61,174,577 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-643 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1754of 1771
top 99.0%
This planet
10.16R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-643 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.16 | 11.21 |
| Mass (M⊕) | 1.00 | 321.01 | 317.83 |
| Density (g/cm³) | 5.51 | 1.68 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 211.71 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 321.008 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 159311390
Gaia DR2
Gaia DR2 2102038912581334656
Gaia DR3
Gaia DR3 2102038912581334656
System
Kepler-643
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 16.34 Earth days (4.5% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1348 AU.
Transit Fingerprint
Depth
0.172 %
Duration
9.358 h
Impact parameter b
0.811
Rp / R★
0.037414
Transit midpoint (BJD)
2,455,010.9168
Photometric dip
Transit produces a flux drop of 1,718 ppm lasting ≈ 9.36 h.
Extended Orbital Architecture
Planet / star radius ratio
0.037414
Semi-major axis / stellar radius
13.770
Impact parameter (b)
0.811
Transit mid-time (BJD)
2,455,010.9168
Angular separation (arcsec)
0.12700
Eq. Temperature
963K
(690 °C)
Insolation (S⊕)
211.71
Earth = 1.00
Earth Similarity (ESI)
0.176
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.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
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-643
Spectral Class
K-type orange
Effective Temperature
4,908 K — cooler than the Sun (5,778 K)
Estimated Age
12.02 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
2.520 R☉
Stellar Mass
1.000 M☉
Metallicity [Fe/H]
0.13
Extended Stellar Properties
Surface gravity (log g)
3.640 dex
Stellar density
0.080 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.911 mas
Total Proper Motion
14.566 mas/yr
PM Right Ascension
-11.59 mas/yr
PM Declination
-8.82 mas/yr
Galactic Cartesian (pc)
x = 0.254 · y = -0.687 · z = 0.681
Equatorial (J2000)
RA 290.32724° · Dec 42.89823°
Galactic ℓ, b
74.723° · 13.041°
Ecliptic λ, β
305.290° · 63.868°
HTM-20 index
1029849273
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