Key parameters at a glance
- A radius of 2.27 Earth radii
- A mass of 5.77 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 184.256 days
- Semi-major axis 0.6689 AU
- Equilibrium temperature 380 K (107 °C)
- Distance from Earth 3,149.23 light-years
- Earth Similarity Index 0.648
- Travel time at Voyager 1 speed 55,536,701 years
2 siblings around Kepler-401
Kepler-401 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-401 b | Super-Earth | 1.71 | 3.57 | 14.383 | 889 | 2014 |
| Kepler-401 c | Sub-Neptune | 2.15 | 5.27 | 47.318 | 598 | 2014 |
| Kepler-401 d this | Sub-Neptune | 2.27 | 5.77 | 184.256 | 380 | 2016 |
Kepler-401 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1554of 1978
top 78.5%
This planet
2.27R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-401 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.27 | 11.21 |
| Mass (M⊕) | 1.00 | 5.77 | 317.83 |
| Density (g/cm³) | 5.51 | 2.71 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.49 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 267746315
Gaia DR2
Gaia DR2 2133178765503484160
Gaia DR3
Gaia DR3 2133178765503484160
System
Kepler-401
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 184.26 Earth days (50.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6689 AU.
Transit Fingerprint
Depth
0.029 %
Duration
11.283 h
Impact parameter b
0.069
Rp / R★
0.015773
Transit midpoint (BJD)
2,455,088.2581
Photometric dip
Transit produces a flux drop of 292 ppm lasting ≈ 11.28 h.
Extended Orbital Architecture
Planet / star radius ratio
0.015773
Semi-major axis / stellar radius
126.400
Impact parameter (b)
0.069
Transit mid-time (BJD)
2,455,088.2581
Angular separation (arcsec)
0.69300
Eq. Temperature
380K
(107 °C)
Insolation (S⊕)
8.49
Earth = 1.00
Earth Similarity (ESI)
0.648
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-401
Spectral Class
F-type yellow-white
Effective Temperature
6,184 K — hotter than the Sun (5,778 K)
Estimated Age
3.39 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.290 R☉
Stellar Mass
1.170 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.280 dex
Stellar density
0.250 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.007 mas
Total Proper Motion
10.908 mas/yr
PM Right Ascension
-1.26 mas/yr
PM Declination
-10.83 mas/yr
Galactic Cartesian (pc)
x = 0.217 · y = -0.593 · z = 0.776
Equatorial (J2000)
RA 290.08275° · Dec 50.86344°
Galactic ℓ, b
82.174° · 16.442°
Ecliptic λ, β
312.638° · 71.341°
HTM-20 index
241941821
Similar Worlds
Kepler-1103 b
Sub-Neptune · F-type yellow-white
Radius 2.27 R⊕ · 4,344.1 ly
DMPP-6 b
Sub-Neptune · F-type yellow-white
Radius 2.28 R⊕ · 178.2 ly
Kepler-1997 b
Sub-Neptune · F-type yellow-white
Radius 2.28 R⊕ · 4,900.0 ly
Kepler-1903 b
Sub-Neptune · F-type yellow-white
Radius 2.29 R⊕ · 5,790.7 ly
Kepler-342 b
Sub-Neptune · F-type yellow-white
Radius 2.25 R⊕ · 2,549.3 ly
Kepler-919 b
Sub-Neptune · F-type yellow-white
Radius 2.25 R⊕ · 3,652.5 ly