Key parameters at a glance
- A radius of 2.32 Earth radii
- A mass of 5.99 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 5.343 days
- Semi-major axis 0.0531 AU
- Equilibrium temperature 799 K (526 °C)
- Distance from Earth 1,114.72 light-years
- Earth Similarity Index 0.326
- Travel time at Voyager 1 speed 19,658,023 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1643 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1469of 1978
top 74.2%
This planet
2.32R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1643 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.32 | 11.21 |
| Mass (M⊕) | 1.00 | 5.99 | 317.83 |
| Density (g/cm³) | 5.51 | 2.64 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | 137.75 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 239307743
Gaia DR2
Gaia DR2 2082142734285082368
Gaia DR3
Gaia DR3 2082142734285082368
System
Kepler-1643
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.34 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0531 AU.
Transit Fingerprint
Depth
0.069 %
Duration
2.410 h
Impact parameter b
0.583
Rp / R★
0.025000
Transit midpoint (BJD)
2,454,967.3820
Photometric dip
Transit produces a flux drop of 689 ppm lasting ≈ 2.41 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025000
Semi-major axis / stellar radius
14.310
Impact parameter (b)
0.583
Transit mid-time (BJD)
2,454,967.3820
Angular separation (arcsec)
0.15500
Eq. Temperature
799K
(526 °C)
Insolation (S⊕)
137.75
Earth = 1.00
Earth Similarity (ESI)
0.326
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-1643
Spectral Class
K-type orange
Effective Temperature
4,916 K — cooler than the Sun (5,778 K)
Estimated Age
0.05 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.855 R☉
Stellar Mass
0.845 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.502 dex
Stellar density
1.910 g/cm³
Rotation period
5.11 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 15 bands
Astrometric Data
Parallax
2.897 mas
Total Proper Motion
3.452 mas/yr
PM Right Ascension
3.14 mas/yr
PM Declination
1.44 mas/yr
Galactic Cartesian (pc)
x = 0.360 · y = -0.612 · z = 0.704
Equatorial (J2000)
RA 300.43101° · Dec 44.75101°
Galactic ℓ, b
79.865° · 7.482°
Ecliptic λ, β
321.924° · 62.811°
HTM-20 index
-1187743939
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