Key parameters at a glance
- A radius of 2.60 Earth radii
- A mass of 7.27 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 27.522 days
- Semi-major axis 0.1445 AU
- Equilibrium temperature 314 K (41 °C)
- Distance from Earth 924.36 light-years
- Earth Similarity Index 0.712
- Travel time at Voyager 1 speed 16,301,065 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-505 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1017of 1978
top 51.4%
This planet
2.60R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-505 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.60 | 11.21 |
| Mass (M⊕) | 1.00 | 7.27 | 317.83 |
| Density (g/cm³) | 5.51 | 2.27 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 3.64 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158631520
Gaia DR2
Gaia DR2 2102511874378223360
Gaia DR3
Gaia DR3 2102511874378223360
System
Kepler-505
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 27.52 Earth days (7.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1445 AU.
Transit Fingerprint
Depth
0.231 %
Duration
4.070 h
Impact parameter b
0.124
Rp / R★
0.045014
Transit midpoint (BJD)
2,455,022.8235
Photometric dip
Transit produces a flux drop of 2,313 ppm lasting ≈ 4.07 h.
Extended Orbital Architecture
Planet / star radius ratio
0.045014
Semi-major axis / stellar radius
53.600
Impact parameter (b)
0.124
Transit mid-time (BJD)
2,455,022.8235
Angular separation (arcsec)
0.51000
Eq. Temperature
314K
(41 °C)
Insolation (S⊕)
3.64
Earth = 1.00
Earth Similarity (ESI)
0.712
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. 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-505
Spectral Class
K-type orange
Effective Temperature
3,931 K — cooler than the Sun (5,778 K)
Estimated Age
3.16 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.530 R☉
Stellar Mass
0.550 M☉
Metallicity [Fe/H]
-0.19
Extended Stellar Properties
Surface gravity (log g)
4.730 dex
Stellar density
3.269 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.500 mas
Total Proper Motion
26.413 mas/yr
PM Right Ascension
-23.60 mas/yr
PM Declination
11.87 mas/yr
Galactic Cartesian (pc)
x = 0.226 · y = -0.701 · z = 0.676
Equatorial (J2000)
RA 287.85795° · Dec 42.54268°
Galactic ℓ, b
73.619° · 14.547°
Ecliptic λ, β
301.102° · 64.066°
HTM-20 index
-1920462718
Similar Worlds
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HD 48948 c
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Kepler-1362 b
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HD 18599 b
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