Key parameters at a glance
- A radius of 2.58 Earth radii
- A mass of 7.18 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 28.475 days
- Semi-major axis 0.1643 AU
- Equilibrium temperature 489 K (216 °C)
- Distance from Earth 2,770.08 light-years
- Earth Similarity Index 0.500
- Travel time at Voyager 1 speed 48,850,394 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-1266
Kepler-1266 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-1266 c | Super-Earth | 1.68 | 3.46 | 4.866 | 881 | 2021 |
| Kepler-1266 b this | Sub-Neptune | 2.58 | 7.18 | 28.475 | 489 | 2016 |
Kepler-1266 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1057of 1978
top 53.4%
This planet
2.58R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1266 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.58 | 11.21 |
| Mass (M⊕) | 1.00 | 7.18 | 317.83 |
| Density (g/cm³) | 5.51 | 2.30 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 10.31 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158167159
Gaia DR2
Gaia DR2 2105528350169042560
Gaia DR3
Gaia DR3 2105528350169042560
System
Kepler-1266
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 28.47 Earth days (7.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1643 AU.
Transit Fingerprint
Depth
0.076 %
Duration
4.809 h
Impact parameter b
0.870
Rp / R★
0.031407
Transit midpoint (BJD)
2,454,987.5819
Photometric dip
Transit produces a flux drop of 764 ppm lasting ≈ 4.81 h.
Extended Orbital Architecture
Planet / star radius ratio
0.031407
Semi-major axis / stellar radius
37.800
Impact parameter (b)
0.870
Transit mid-time (BJD)
2,454,987.5819
Angular separation (arcsec)
0.19300
Eq. Temperature
489K
(216 °C)
Insolation (S⊕)
10.31
Earth = 1.00
Earth Similarity (ESI)
0.500
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. 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-1266
Spectral Class
K-type orange
Effective Temperature
5,044 K — cooler than the Sun (5,778 K)
Estimated Age
5.13 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.760 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
-0.07
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
2.070 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
1.149 mas
Total Proper Motion
19.670 mas/yr
PM Right Ascension
5.14 mas/yr
PM Declination
-18.99 mas/yr
Galactic Cartesian (pc)
x = 0.201 · y = -0.707 · z = 0.679
Equatorial (J2000)
RA 285.86933° · Dec 42.72800°
Galactic ℓ, b
73.202° · 15.966°
Ecliptic λ, β
297.958° · 64.634°
HTM-20 index
1284420662
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