Key parameters at a glance
- A radius of 12.22 Earth radii
- A mass of 108.06 Earth masses
- Surface gravity around 0.72 g
- An orbital period of 3.218 days
- Semi-major axis 0.0414 AU
- Equilibrium temperature 1,300 K (1027 °C)
- Distance from Earth 2,751.76 light-years
- Earth Similarity Index 0.086
- Travel time at Voyager 1 speed 48,527,318 years
Kepler-426 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1401of 1771
top 79.1%
This planet
12.22R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-426 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.22 | 11.21 |
| Mass (M⊕) | 1.00 | 108.06 | 317.83 |
| Density (g/cm³) | 5.51 | 0.26 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.72 | 2.53 |
| Insolation (S⊕) | 1.00 | 410.72 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 108.060 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 299220166
Gaia DR2
Gaia DR2 2132623993168462464
Gaia DR3
Gaia DR3 2132623993168462464
System
Kepler-426
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.22 Earth days (0.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0414 AU.
Transit Fingerprint
Depth
1.432 %
Duration
2.191 h
Impact parameter b
0.718
Rp / R★
0.122100
Transit midpoint (BJD)
2,454,966.6320
Photometric dip
Transit produces a flux drop of 14,319 ppm lasting ≈ 2.19 h.
Extended Orbital Architecture
Planet / star radius ratio
0.122100
Semi-major axis / stellar radius
9.670
Impact parameter (b)
0.718
RV semi-amplitude (K)
50.000 m/s
Transit mid-time (BJD)
2,454,966.6320
Angular separation (arcsec)
0.04910
Eq. Temperature
1,300K
(1027 °C)
Insolation (S⊕)
410.72
Earth = 1.00
Earth Similarity (ESI)
0.086
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
H Eacute Brard et al. 2014Instrument
Kepler CCD Array
Publication
2014-12
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-426
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,725 K — cooler than the Sun (5,778 K)
Estimated Age
6.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.920 R☉
Stellar Mass
0.910 M☉
Metallicity [Fe/H]
-0.21
Extended Stellar Properties
Surface gravity (log g)
4.471 dex
Stellar density
1.170 g/cm³
Systemic radial velocity
-78.84 km/s
Rotational v·sin i
3.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.157 mas
Total Proper Motion
8.566 mas/yr
PM Right Ascension
0.17 mas/yr
PM Declination
8.56 mas/yr
Galactic Cartesian (pc)
x = 0.216 · y = -0.613 · z = 0.760
Equatorial (J2000)
RA 289.43467° · Dec 49.47346°
Galactic ℓ, b
80.672° · 16.283°
Ecliptic λ, β
309.758° · 70.242°
HTM-20 index
466496474
Similar Worlds
Kepler-44 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.22 R⊕ · 3,874.7 ly
TOI-559 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.23 R⊕ · 760.8 ly
TOI-3364 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.23 R⊕ · 906.4 ly
Kepler-1976 b
Gas Giant · G-type yellow (Sun-like)
Radius 12.21 R⊕ · 4,287.4 ly
HD 68988 c
Gas Giant · G-type yellow (Sun-like)
Radius 12.20 R⊕ · 198.4 ly
11 Com b
Gas Giant · G-type yellow (Sun-like)
Radius 12.20 R⊕ · 303.9 ly