Key parameters at a glance
- A radius of 9.98 Earth radii
- A mass of 327.35 Earth masses
- Surface gravity around 3.29 g
- An orbital period of 3.312 days
- Semi-major axis 0.0440 AU
- Equilibrium temperature 1,116 K (843 °C)
- Distance from Earth 2,278.68 light-years
- Earth Similarity Index 0.154
- Travel time at Voyager 1 speed 40,184,446 years
1 sibling around Kepler-424
Kepler-424 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-424 b this | Neptune-like | 9.98 | 327.35 | 3.312 | 1,116 | 2014 |
| Kepler-424 c | Gas Giant | 12.70 | 2,215.18 | 223.300 | — | 2014 |
Kepler-424 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#2of 574
top 0.2%
This planet
9.98R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-424 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.98 | 11.21 |
| Mass (M⊕) | 1.00 | 327.35 | 317.83 |
| Density (g/cm³) | 5.51 | 1.94 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.29 | 2.53 |
| Insolation (S⊕) | 1.00 | 470.75 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 327.350 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 264508014
Gaia DR2
Gaia DR2 2086877265710250496
Gaia DR3
Gaia DR3 2086877265710250496
System
Kepler-424
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.31 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0440 AU.
Transit Fingerprint
Depth
0.598 %
Duration
1.394 h
Impact parameter b
0.934
Rp / R★
0.096100
Transit midpoint (BJD)
2,454,964.7427
Photometric dip
Transit produces a flux drop of 5,977 ppm lasting ≈ 1.39 h.
Extended Orbital Architecture
Planet / star radius ratio
0.096100
Semi-major axis / stellar radius
11.209
Impact parameter (b)
0.934
RV semi-amplitude (K)
140.000 m/s
Transit mid-time (BJD)
2,454,964.7427
Angular separation (arcsec)
0.06300
Eq. Temperature
1,116K
(843 °C)
Insolation (S⊕)
470.75
Earth = 1.00
Earth Similarity (ESI)
0.154
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-424
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,460 K — cooler than the Sun (5,778 K)
Estimated Age
4.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.940 R☉
Stellar Mass
1.010 M☉
Metallicity [Fe/H]
0.44
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
1.730 g/cm³
Rotational v·sin i
0.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.403 mas
Total Proper Motion
6.295 mas/yr
PM Right Ascension
6.19 mas/yr
PM Declination
1.16 mas/yr
Galactic Cartesian (pc)
x = 0.317 · y = -0.581 · z = 0.750
Equatorial (J2000)
RA 298.62498° · Dec 48.57745°
Galactic ℓ, b
82.577° · 10.483°
Ecliptic λ, β
323.495° · 66.777°
HTM-20 index
1537341302
Similar Worlds
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WASP-60 b
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