Key parameters at a glance
- A radius of 3.01 Earth radii
- A mass of 9.32 Earth masses
- Surface gravity around 1.03 g
- An orbital period of 55.639 days
- Semi-major axis 0.2901 AU
- Equilibrium temperature 478 K (205 °C)
- Distance from Earth 3,135.68 light-years
- Earth Similarity Index 0.480
- Travel time at Voyager 1 speed 55,297,715 years
Context from the literature
The list of exoplanets detected by the Kepler space telescope contains bodies with a wide variety of properties, with significant ranges in orbital distances, masses, radii, composition, habitability, and host star type. As of June 16 2023, the Kepler space telescope and its follow-up observations have detected 2,778 planets, including hot Jupiters, super-Earths, circumbinary planets, and planets located in the circumstellar habitable zones of their host stars. Kepler has detected over 3,601 unconfirmed planet candidates and 2,165 eclipsing binary stars.
Excerpted from Wikipedia · full article
Kepler-809 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#509of 1978
top 25.7%
This planet
3.01R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-809 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.01 | 11.21 |
| Mass (M⊕) | 1.00 | 9.32 | 317.83 |
| Density (g/cm³) | 5.51 | 1.88 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.03 | 2.53 |
| Insolation (S⊕) | 1.00 | 13.16 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 299156496
Gaia DR2
Gaia DR2 2130951464184187392
Gaia DR3
Gaia DR3 2130951464184187392
System
Kepler-809
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 55.64 Earth days (15.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2901 AU.
Transit Fingerprint
Depth
0.085 %
Duration
7.119 h
Impact parameter b
0.532
Rp / R★
0.028188
Transit midpoint (BJD)
2,455,020.5506
Photometric dip
Transit produces a flux drop of 853 ppm lasting ≈ 7.12 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028188
Semi-major axis / stellar radius
52.500
Impact parameter (b)
0.532
Transit mid-time (BJD)
2,455,020.5506
Angular separation (arcsec)
0.30200
Eq. Temperature
478K
(205 °C)
Insolation (S⊕)
13.16
Earth = 1.00
Earth Similarity (ESI)
0.480
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-809
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,734 K — cooler than the Sun (5,778 K)
Estimated Age
4.37 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.980 R☉
Stellar Mass
0.990 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
0.886 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.011 mas
Total Proper Motion
12.131 mas/yr
PM Right Ascension
0.64 mas/yr
PM Declination
-12.11 mas/yr
Galactic Cartesian (pc)
x = 0.219 · y = -0.632 · z = 0.743
Equatorial (J2000)
RA 289.08363° · Dec 48.01807°
Galactic ℓ, b
79.183° · 15.927°
Ecliptic λ, β
307.567° · 68.981°
HTM-20 index
-527991990
Similar Worlds
Kepler-530 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.01 R⊕ · 1,492.8 ly
Kepler-679 b
Sub-Neptune · G-type yellow (Sun-like)
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Kepler-180 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.01 R⊕ · 2,268.9 ly
Kepler-623 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.01 R⊕ · 2,406.1 ly
Kepler-1036 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.01 R⊕ · 1,596.3 ly
Kepler-414 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.01 R⊕ · 1,348.5 ly