Key parameters at a glance
- A radius of 10.55 Earth radii
- A mass of 196.00 Earth masses
- Surface gravity around 1.76 g
- An orbital period of 20.358 days
- Semi-major axis 0.1208 AU
- Equilibrium temperature 377 K (104 °C)
- Distance from Earth 876.33 light-years
- Earth Similarity Index 0.384
- Travel time at Voyager 1 speed 15,454,118 years
- Almost certainly tidally locked to its host star given the close orbit
K2-419 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1721of 1771
top 97.1%
This planet
10.55R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | K2-419 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 10.55 | 11.21 |
| Mass (M⊕) | 1.00 | 196.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.92 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.76 | 2.53 |
| Insolation (S⊕) | 1.00 | 3.30 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 196.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 437054764
Gaia DR2
Gaia DR2 605593554127479936
Gaia DR3
Gaia DR3 605593554127479936
System
K2-419
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 20.36 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1208 AU.
Transit Fingerprint
Depth
3.912 %
Duration
3.574 h
Impact parameter b
0.389
Rp / R★
0.180500
Transit midpoint (BJD)
2,459,553.7138
Photometric dip
Transit produces a flux drop of 39,120 ppm lasting ≈ 3.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.180500
Semi-major axis / stellar radius
48.460
Impact parameter (b)
0.389
RV semi-amplitude (K)
67.000 m/s
Transit mid-time (BJD)
2,459,553.7138
Long. of periastron (ω)
0.97°
Angular separation (arcsec)
0.45000
Eq. Temperature
377K
(104 °C)
Insolation (S⊕)
3.30
Earth = 1.00
Earth Similarity (ESI)
0.384
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
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
Kanodia et al. 2024Instrument
Kepler CCD Array
Publication
2024-08
Observation locale
Space
Host System: K2-419 A
Spectral Class
K-type orange
Effective Temperature
3,711 K — cooler than the Sun (5,778 K)
Estimated Age
7.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.541 R☉
Stellar Mass
0.562 M☉
Metallicity [Fe/H]
-0.11
Extended Stellar Properties
Surface gravity (log g)
4.740 dex
Stellar density
4.990 g/cm³
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.694 mas
Total Proper Motion
76.669 mas/yr
PM Right Ascension
-71.74 mas/yr
PM Declination
-27.06 mas/yr
Galactic Cartesian (pc)
x = -0.688 · y = 0.688 · z = 0.230
Equatorial (J2000)
RA 135.01949° · Dec 13.27371°
Galactic ℓ, b
215.148° · 34.456°
Ecliptic λ, β
133.612° · -3.612°
HTM-20 index
255525173
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