Key parameters at a glance
- A radius of 2.03 Earth radii
- A mass of 4.47 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 9.035 days
- Semi-major axis 0.0800 AU
- Equilibrium temperature 789 K (516 °C)
- Distance from Earth 5,327.73 light-years
- Earth Similarity Index 0.345
- Travel time at Voyager 1 speed 93,954,437 years
1 sibling around Kepler-1705
Kepler-1705 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-1705 b this | Sub-Neptune | 2.03 | 4.47 | 9.035 | 789 | 2021 |
| Kepler-1705 c | Sub-Neptune | 2.05 | 5.42 | 11.280 | — | 2021 |
Kepler-1705 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1915of 1978
top 96.8%
This planet
2.03R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1705 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.03 | 11.21 |
| Mass (M⊕) | 1.00 | 4.47 | 317.83 |
| Density (g/cm³) | 5.51 | 2.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 91.74 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 4.470 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 185335907
Gaia DR2
Gaia DR2 2081875484241210240
Gaia DR3
Gaia DR3 2081875484241210240
System
Kepler-1705
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.04 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0800 AU.
Transit Fingerprint
Depth
0.019 %
Duration
5.920 h
Impact parameter b
0.320
Rp / R★
0.012789
Transit midpoint (BJD)
2,455,198.2140
Photometric dip
Transit produces a flux drop of 192 ppm lasting ≈ 5.92 h.
Extended Orbital Architecture
Planet / star radius ratio
0.012789
Semi-major axis / stellar radius
15.210
Impact parameter (b)
0.320
Transit mid-time (BJD)
2,455,198.2140
Long. of periastron (ω)
35.00°
Angular separation (arcsec)
0.04900
Eq. Temperature
789K
(516 °C)
Insolation (S⊕)
91.74
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.
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
Leleu et al. 2021Instrument
Kepler CCD Array
Publication
2021-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-1705
Spectral Class
F-type yellow-white
Effective Temperature
6,312 K — hotter than the Sun (5,778 K)
Estimated Age
2.59 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.259 R☉
Stellar Mass
1.139 M☉
Metallicity [Fe/H]
-0.20
Extended Stellar Properties
Surface gravity (log g)
4.298 dex
Stellar density
0.797 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
0.585 mas
Total Proper Motion
2.990 mas/yr
PM Right Ascension
-1.08 mas/yr
PM Declination
-2.79 mas/yr
Galactic Cartesian (pc)
x = 0.375 · y = -0.610 · z = 0.699
Equatorial (J2000)
RA 301.57853° · Dec 44.31216°
Galactic ℓ, b
79.920° · 6.555°
Ecliptic λ, β
323.089° · 62.056°
HTM-20 index
-642201263
Similar Worlds
DMPP-1 d
Sub-Neptune · F-type yellow-white
Radius 2.02 R⊕ · 204.0 ly
Kepler-365 b
Sub-Neptune · F-type yellow-white
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Kepler-1422 b
Sub-Neptune · F-type yellow-white
Radius 2.02 R⊕ · 8,042.5 ly
Kepler-1626 b
Sub-Neptune · F-type yellow-white
Radius 2.02 R⊕ · 4,464.5 ly
K2-46 b
Sub-Neptune · F-type yellow-white
Radius 2.05 R⊕ · 1,465.2 ly
Kepler-136 b
Sub-Neptune · F-type yellow-white
Radius 2.05 R⊕ · 1,372.5 ly