Key parameters at a glance
- A radius of 1.70 Earth radii
- A mass of 3.53 Earth masses
- Surface gravity around 1.22 g
- An orbital period of 9.176 days
- Semi-major axis 0.0870 AU
- Equilibrium temperature 960 K (687 °C)
- Distance from Earth 2,539.63 light-years
- Earth Similarity Index 0.300
- Travel time at Voyager 1 speed 44,786,315 years
2 siblings around Kepler-311
Kepler-311 b 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-311 b this | Super-Earth | 1.70 | 3.53 | 9.176 | 960 | 2014 |
| Kepler-311 c | Super-Earth | 1.43 | 2.63 | 19.738 | 744 | 2014 |
| Kepler-311 d | Sub-Neptune | 2.05 | 4.86 | 232.040 | 327 | 2023 |
Kepler-311 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#401of 1176
top 34.0%
This planet
1.70R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-311 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.70 | 11.21 |
| Mass (M⊕) | 1.00 | 3.53 | 317.83 |
| Density (g/cm³) | 5.51 | 3.95 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.22 | 2.53 |
| Insolation (S⊕) | 1.00 | 201.36 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 351898154
Gaia DR2
Gaia DR2 2119534646538533888
Gaia DR3
Gaia DR3 2119534646538533888
System
Kepler-311
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.18 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0870 AU.
Transit Fingerprint
Depth
0.021 %
Duration
4.342 h
Impact parameter b
0.010
Rp / R★
0.013130
Transit midpoint (BJD)
2,454,971.7174
Photometric dip
Transit produces a flux drop of 207 ppm lasting ≈ 4.34 h.
Extended Orbital Architecture
Planet / star radius ratio
0.013130
Semi-major axis / stellar radius
16.573
Impact parameter (b)
0.010
Transit mid-time (BJD)
2,454,971.7174
Angular separation (arcsec)
0.11200
Eq. Temperature
960K
(687 °C)
Insolation (S⊕)
201.36
Earth = 1.00
Earth Similarity (ESI)
0.300
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-311
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,905 K — hotter than the Sun (5,778 K)
Estimated Age
1.95 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.188 R☉
Stellar Mass
0.994 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.308 dex
Stellar density
0.690 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.255 mas
Total Proper Motion
7.907 mas/yr
PM Right Ascension
-6.86 mas/yr
PM Declination
3.94 mas/yr
Galactic Cartesian (pc)
x = 0.142 · y = -0.666 · z = 0.732
Equatorial (J2000)
RA 282.06127° · Dec 47.08550°
Galactic ℓ, b
76.493° · 20.023°
Ecliptic λ, β
293.993° · 69.522°
HTM-20 index
1727815755
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