Key parameters at a glance
- A radius of 1.79 Earth radii
- A mass of 3.87 Earth masses
- Surface gravity around 1.20 g
- An orbital period of 3.205 days
- Semi-major axis 0.0402 AU
- Equilibrium temperature 1,000 K (727 °C)
- Distance from Earth 2,832.59 light-years
- Earth Similarity Index 0.282
- Travel time at Voyager 1 speed 49,952,719 years
- Almost certainly tidally locked to its host star given the close orbit
3 siblings around Kepler-305
Kepler-305 e shares its host star with 3 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-305 e this | Super-Earth | 1.79 | 3.87 | 3.205 | 1,000 | 2020 |
| Kepler-305 b | Sub-Neptune | 3.60 | 10.50 | 5.487 | 836 | 2013 |
| Kepler-305 c | Sub-Neptune | 3.30 | 6.00 | 8.291 | 728 | 2013 |
| Kepler-305 d | Sub-Neptune | 2.76 | 6.20 | 16.740 | 576 | 2014 |
Kepler-305 e Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#268of 1176
top 22.7%
This planet
1.79R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-305 e | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.79 | 11.21 |
| Mass (M⊕) | 1.00 | 3.87 | 317.83 |
| Density (g/cm³) | 5.51 | 3.68 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.20 | 2.53 |
| Insolation (S⊕) | 1.00 | 220.40 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 171879024
Gaia DR2
Gaia DR2 2073547954981763328
Gaia DR3
Gaia DR3 2073547954981763328
System
Kepler-305
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.21 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0402 AU.
Transit Fingerprint
Depth
0.045 %
Duration
2.143 h
Impact parameter b
0.833
Rp / R★
0.019789
Transit midpoint (BJD)
2,455,187.6310
Photometric dip
Transit produces a flux drop of 454 ppm lasting ≈ 2.14 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019789
Semi-major axis / stellar radius
11.510
Impact parameter (b)
0.833
Transit mid-time (BJD)
2,455,187.6310
Angular separation (arcsec)
0.04630
Eq. Temperature
1,000K
(727 °C)
Insolation (S⊕)
220.40
Earth = 1.00
Earth Similarity (ESI)
0.282
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Armstrong et al. 2021Instrument
Kepler CCD Array
Publication
2021-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Kepler (12 shown).
Host System: Kepler-305
Spectral Class
K-type orange
Effective Temperature
4,974 K — cooler than the Sun (5,778 K)
Estimated Age
4.37 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.827 R☉
Stellar Mass
0.820 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.517 dex
Stellar density
2.042 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.124 mas
Total Proper Motion
11.427 mas/yr
PM Right Ascension
-11.12 mas/yr
PM Declination
-2.61 mas/yr
Galactic Cartesian (pc)
x = 0.372 · y = -0.665 · z = 0.647
Equatorial (J2000)
RA 299.22426° · Dec 40.34317°
Galactic ℓ, b
75.600° · 5.973°
Ecliptic λ, β
316.525° · 59.152°
HTM-20 index
-691944491
Similar Worlds
Kepler-1794 b
Super-Earth · K-type orange
Radius 1.79 R⊕ · 1,830.5 ly
TOI-1075 b
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Kepler-768 b
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K2-155 b
Super-Earth · K-type orange
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TOI-2427 b
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Radius 1.80 R⊕ · 1,935.4 ly