Key parameters at a glance
- A radius of 2.08 Earth radii
- A mass of 4.98 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 10.614 days
- Semi-major axis 0.0950 AU
- Equilibrium temperature 785 K (512 °C)
- Distance from Earth 3,473.82 light-years
- Earth Similarity Index 0.345
- Travel time at Voyager 1 speed 61,260,853 years
1 sibling around Kepler-405
Kepler-405 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-405 b this | Sub-Neptune | 2.08 | 4.98 | 10.614 | 785 | 2014 |
| Kepler-405 c | Neptune-like | 4.66 | 19.60 | 29.727 | 557 | 2014 |
Kepler-405 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1846of 1978
top 93.3%
This planet
2.08R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-405 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.08 | 11.21 |
| Mass (M⊕) | 1.00 | 4.98 | 317.83 |
| Density (g/cm³) | 5.51 | 3.04 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 55.62 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 137150544
Gaia DR2
Gaia DR2 2052726984308676864
Gaia DR3
Gaia DR3 2052726984308676864
System
Kepler-405
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 10.61 Earth days (2.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0950 AU.
Transit Fingerprint
Depth
0.056 %
Duration
3.538 h
Impact parameter b
0.450
Rp / R★
0.021552
Transit midpoint (BJD)
2,455,196.7368
Photometric dip
Transit produces a flux drop of 560 ppm lasting ≈ 3.54 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021552
Semi-major axis / stellar radius
23.680
Impact parameter (b)
0.450
Transit mid-time (BJD)
2,455,196.7368
Angular separation (arcsec)
0.08920
Eq. Temperature
785K
(512 °C)
Insolation (S⊕)
55.62
Earth = 1.00
Earth Similarity (ESI)
0.345
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
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-405
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,818 K — hotter than the Sun (5,778 K)
Estimated Age
2.09 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.893 R☉
Stellar Mass
0.873 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.536 dex
Stellar density
1.650 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
0.912 mas
Total Proper Motion
1.733 mas/yr
PM Right Ascension
-0.86 mas/yr
PM Declination
-1.51 mas/yr
Galactic Cartesian (pc)
x = 0.286 · y = -0.730 · z = 0.620
Equatorial (J2000)
RA 291.40946° · Dec 38.34001°
Galactic ℓ, b
70.898° · 10.316°
Ecliptic λ, β
304.075° · 59.272°
HTM-20 index
2137838697
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TOI-2128 b
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