Key parameters at a glance
- A radius of 9.66 Earth radii
- A mass of 67.50 Earth masses
- Surface gravity around 0.72 g
- An orbital period of 197.511 days
- Semi-major axis 0.6843 AU
- Equilibrium temperature 391 K (118 °C)
- Distance from Earth 2,825.59 light-years
- Earth Similarity Index 0.333
- Travel time at Voyager 1 speed 49,829,286 years
2 siblings around Kepler-1311
Kepler-1311 d 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-1311 c | Rocky Terrestrial | 1.22 | 1.98 | 2.536 | 1,671 | 2016 |
| Kepler-1311 b | Rocky Terrestrial | 1.24 | 2.07 | 11.173 | 1,019 | 2016 |
| Kepler-1311 d this | Neptune-like | 9.66 | 67.50 | 197.511 | 391 | 2021 |
Kepler-1311 d Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#27of 574
top 4.5%
This planet
9.66R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-1311 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.66 | 11.21 |
| Mass (M⊕) | 1.00 | 67.50 | 317.83 |
| Density (g/cm³) | 5.51 | 0.41 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.72 | 2.53 |
| Insolation (S⊕) | 1.00 | 6.00 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159106207
Gaia DR2
Gaia DR2 2102877015319104640
Gaia DR3
Gaia DR3 2102877015319104640
System
Kepler-1311
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 197.51 Earth days (54.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6843 AU.
Transit Fingerprint
Depth
0.258 %
Duration
11.245 h
Impact parameter b
0.834
Rp / R★
0.053468
Transit midpoint (BJD)
2,455,105.3860
Photometric dip
Transit produces a flux drop of 2,576 ppm lasting ≈ 11.24 h.
Extended Orbital Architecture
Planet / star radius ratio
0.053468
Semi-major axis / stellar radius
90.200
Impact parameter (b)
0.834
Transit mid-time (BJD)
2,455,105.3860
Angular separation (arcsec)
0.79000
Eq. Temperature
391K
(118 °C)
Insolation (S⊕)
6.00
Earth = 1.00
Earth Similarity (ESI)
0.333
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
Valizadegan et al. 2022Instrument
Kepler CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-1311
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,616 K — cooler than the Sun (5,778 K)
Estimated Age
7.59 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.674 R☉
Stellar Mass
1.032 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.004 dex
Stellar density
0.361 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.126 mas
Total Proper Motion
7.026 mas/yr
PM Right Ascension
3.20 mas/yr
PM Declination
6.26 mas/yr
Galactic Cartesian (pc)
x = 0.243 · y = -0.679 · z = 0.692
Equatorial (J2000)
RA 289.65126° · Dec 43.82444°
Galactic ℓ, b
75.376° · 13.875°
Ecliptic λ, β
304.885° · 64.901°
HTM-20 index
931493814
Similar Worlds
TOI-1298 b
Neptune-like · G-type yellow (Sun-like)
Radius 9.66 R⊕ · 1,040.6 ly
Kepler-714 b
Neptune-like · G-type yellow (Sun-like)
Radius 9.67 R⊕ · 6,795.0 ly
TOI-2876 b
Neptune-like · G-type yellow (Sun-like)
Radius 9.64 R⊕ · 736.3 ly
TOI-2447 b
Neptune-like · G-type yellow (Sun-like)
Radius 9.61 R⊕ · 485.9 ly
HD 107148 b
Neptune-like · G-type yellow (Sun-like)
Radius 9.60 R⊕ · 161.2 ly
HD 76700 b
Neptune-like · G-type yellow (Sun-like)
Radius 9.60 R⊕ · 198.6 ly