Key parameters at a glance
- A radius of 13.36 Earth radii
- A mass of 189.10 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 2.684 days
- Semi-major axis 0.0359 AU
- Equilibrium temperature 1,605 K (1332 °C)
- Distance from Earth 2,474.72 light-years
- Earth Similarity Index 0.075
- Travel time at Voyager 1 speed 43,641,657 years
Kepler-423 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#785of 1771
top 44.3%
This planet
13.36R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | Kepler-423 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 13.36 | 11.21 |
| Mass (M⊕) | 1.00 | 189.10 | 317.83 |
| Density (g/cm³) | 5.51 | 0.46 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 649.15 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 189.101 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 63452790
Gaia DR2
Gaia DR2 2128273225659492608
Gaia DR3
Gaia DR3 2128273225659492608
System
Kepler-423
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.68 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0358 AU.
Transit Fingerprint
Depth
1.587 %
Duration
2.722 h
Impact parameter b
0.301
Rp / R★
0.125990
Transit midpoint (BJD)
2,454,966.3548
Photometric dip
Transit produces a flux drop of 15,872 ppm lasting ≈ 2.72 h.
Extended Orbital Architecture
Planet / star radius ratio
0.125990
Semi-major axis / stellar radius
8.106
Impact parameter (b)
0.301
RV semi-amplitude (K)
96.700 m/s
Transit mid-time (BJD)
2,454,966.3548
Long. of periastron (ω)
120.26°
Angular separation (arcsec)
0.04720
Eq. Temperature
1,605K
(1332 °C)
Insolation (S⊕)
649.15
Earth = 1.00
Earth Similarity (ESI)
0.075
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-423
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,560 K — cooler than the Sun (5,778 K)
Estimated Age
11.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.950 R☉
Stellar Mass
0.850 M☉
Metallicity [Fe/H]
-0.10
Extended Stellar Properties
Surface gravity (log g)
4.410 dex
Stellar density
1.398 g/cm³
Systemic radial velocity
-3.04 km/s
Rotational v·sin i
2.50 km/s
Rotation period
22.05 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.289 mas
Total Proper Motion
4.258 mas/yr
PM Right Ascension
-2.01 mas/yr
PM Declination
3.76 mas/yr
Galactic Cartesian (pc)
x = 0.268 · y = -0.636 · z = 0.724
Equatorial (J2000)
RA 292.85572° · Dec 46.39119°
Galactic ℓ, b
78.753° · 12.921°
Ecliptic λ, β
312.229° · 66.511°
HTM-20 index
-966356406
Similar Worlds
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HD 159243 c
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