Key parameters at a glance
- A radius of 12.89 Earth radii
- A mass of 136.66 Earth masses
- Surface gravity around 0.82 g
- An orbital period of 7.891 days
- Semi-major axis 0.0820 AU
- Equilibrium temperature 1,028 K (755 °C)
- Distance from Earth 2,357.44 light-years
- Earth Similarity Index 0.121
- Travel time at Voyager 1 speed 41,573,439 years
Kepler-422 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1052of 1771
top 59.3%
This planet
12.89R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-422 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.89 | 11.21 |
| Mass (M⊕) | 1.00 | 136.66 | 317.83 |
| Density (g/cm³) | 5.51 | 0.38 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.82 | 2.53 |
| Insolation (S⊕) | 1.00 | 264.98 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 136.660 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 123495874
Gaia DR2
Gaia DR2 2107114704928577792
Gaia DR3
Gaia DR3 2107114704928577792
System
Kepler-422
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.89 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0820 AU.
Transit Fingerprint
Depth
1.061 %
Duration
4.285 h
Impact parameter b
0.416
Rp / R★
0.095700
Transit midpoint (BJD)
2,455,010.2501
Photometric dip
Transit produces a flux drop of 10,613 ppm lasting ≈ 4.29 h.
Extended Orbital Architecture
Planet / star radius ratio
0.095700
Semi-major axis / stellar radius
14.784
Impact parameter (b)
0.416
RV semi-amplitude (K)
40.000 m/s
Transit mid-time (BJD)
2,455,010.2501
Angular separation (arcsec)
0.11300
Eq. Temperature
1,028K
(755 °C)
Insolation (S⊕)
264.98
Earth = 1.00
Earth Similarity (ESI)
0.121
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
Endl et al. 2014Instrument
Kepler CCD Array
Publication
2014-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-422
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,972 K — hotter than the Sun (5,778 K)
Estimated Age
3.40 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.240 R☉
Stellar Mass
1.150 M☉
Metallicity [Fe/H]
0.23
Extended Stellar Properties
Surface gravity (log g)
4.310 dex
Stellar density
0.860 g/cm³
Systemic radial velocity
-11.69 km/s
Rotational v·sin i
2.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.355 mas
Total Proper Motion
12.299 mas/yr
PM Right Ascension
-3.55 mas/yr
PM Declination
-11.78 mas/yr
Galactic Cartesian (pc)
x = 0.151 · y = -0.674 · z = 0.723
Equatorial (J2000)
RA 282.62963° · Dec 46.32328°
Galactic ℓ, b
75.863° · 19.406°
Ecliptic λ, β
294.545° · 68.689°
HTM-20 index
1649569897
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