Key parameters at a glance
- A radius of 3.89 Earth radii
- A mass of 14.40 Earth masses
- Surface gravity around 0.95 g
- An orbital period of 107.724 days
- Semi-major axis 0.4570 AU
- Equilibrium temperature 421 K (148 °C)
- Distance from Earth 4,470.91 light-years
- Earth Similarity Index 0.480
- Travel time at Voyager 1 speed 78,844,561 years
1 sibling around Kepler-266
Kepler-266 c 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-266 b | Sub-Neptune | 2.48 | 6.71 | 6.618 | 1,066 | 2014 |
| Kepler-266 c this | Sub-Neptune | 3.89 | 14.40 | 107.724 | 421 | 2014 |
Kepler-266 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#28of 1978
top 1.4%
This planet
3.89R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-266 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.89 | 11.21 |
| Mass (M⊕) | 1.00 | 14.40 | 317.83 |
| Density (g/cm³) | 5.51 | 1.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.95 | 2.53 |
| Insolation (S⊕) | 1.00 | 5.59 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 271046092
Gaia DR2
Gaia DR2 2078328287926130304
Gaia DR3
Gaia DR3 2078328287926130304
System
Kepler-266
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 107.72 Earth days (29.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4570 AU.
Transit Fingerprint
Depth
0.140 %
Duration
8.080 h
Impact parameter b
0.320
Rp / R★
0.034388
Transit midpoint (BJD)
2,455,187.1835
Photometric dip
Transit produces a flux drop of 1,396 ppm lasting ≈ 8.08 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034388
Semi-major axis / stellar radius
105.770
Impact parameter (b)
0.320
Transit mid-time (BJD)
2,455,187.1835
Angular separation (arcsec)
0.33300
Eq. Temperature
421K
(148 °C)
Insolation (S⊕)
5.59
Earth = 1.00
Earth Similarity (ESI)
0.480
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-266
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,885 K — hotter than the Sun (5,778 K)
Estimated Age
4.79 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.028 R☉
Stellar Mass
0.947 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.453 dex
Stellar density
1.115 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.702 mas
Total Proper Motion
2.011 mas/yr
PM Right Ascension
-1.32 mas/yr
PM Declination
-1.52 mas/yr
Galactic Cartesian (pc)
x = 0.297 · y = -0.653 · z = 0.697
Equatorial (J2000)
RA 294.48438° · Dec 44.16694°
Galactic ℓ, b
77.247° · 10.898°
Ecliptic λ, β
312.730° · 64.018°
HTM-20 index
-1301123360
Similar Worlds
HD 20003 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.89 R⊕ · 136.4 ly
HD 42618 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.89 R⊕ · 79.4 ly
Kepler-30 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.90 R⊕ · 2,981.8 ly
Kepler-368 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.88 R⊕ · 2,514.6 ly
K2-388 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.90 R⊕ · 947.5 ly
K2-100 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 3.88 R⊕ · 616.3 ly