Key parameters at a glance
- A radius of 2.00 Earth radii
- A mass of 4.66 Earth masses
- Surface gravity around 1.17 g
- An orbital period of 11.419 days
- Semi-major axis 0.0795 AU
- Equilibrium temperature 419 K (146 °C)
- Distance from Earth 1,436.48 light-years
- Earth Similarity Index 0.627
- Travel time at Voyager 1 speed 25,332,250 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-801 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1955of 1978
top 98.8%
This planet
2.00R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-801 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.00 | 11.21 |
| Mass (M⊕) | 1.00 | 4.66 | 317.83 |
| Density (g/cm³) | 5.51 | 3.20 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.17 | 2.53 |
| Insolation (S⊕) | 1.00 | 14.44 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158171839
Gaia DR2
Gaia DR2 2106293816419205504
Gaia DR3
Gaia DR3 2106293816419205504
System
Kepler-801
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.42 Earth days (3.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0795 AU.
Transit Fingerprint
Depth
0.092 %
Duration
3.987 h
Impact parameter b
0.799
Rp / R★
0.028926
Transit midpoint (BJD)
2,454,970.6677
Photometric dip
Transit produces a flux drop of 916 ppm lasting ≈ 3.99 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028926
Semi-major axis / stellar radius
21.830
Impact parameter (b)
0.799
Transit mid-time (BJD)
2,454,970.6677
Angular separation (arcsec)
0.18100
Eq. Temperature
419K
(146 °C)
Insolation (S⊕)
14.44
Earth = 1.00
Earth Similarity (ESI)
0.627
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-801
Spectral Class
K-type orange
Effective Temperature
4,435 K — cooler than the Sun (5,778 K)
Estimated Age
3.55 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.630 R☉
Stellar Mass
0.670 M☉
Metallicity [Fe/H]
-0.17
Extended Stellar Properties
Surface gravity (log g)
4.660 dex
Stellar density
1.510 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.242 mas
Total Proper Motion
6.993 mas/yr
PM Right Ascension
-6.67 mas/yr
PM Declination
-2.11 mas/yr
Galactic Cartesian (pc)
x = 0.197 · y = -0.683 · z = 0.703
Equatorial (J2000)
RA 286.07518° · Dec 44.66463°
Galactic ℓ, b
75.129° · 16.561°
Ecliptic λ, β
299.544° · 66.463°
HTM-20 index
-1986767540
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