Key parameters at a glance
- A radius of 1.04 Earth radii
- A mass of 6.20 Earth masses
- Surface gravity around 5.69 g
- An orbital period of 2.508 days
- Semi-major axis 0.0348 AU
- Equilibrium temperature 1,258 K (985 °C)
- Distance from Earth 945.29 light-years
- Earth Similarity Index 0.166
- Travel time at Voyager 1 speed 16,670,156 years
2 siblings around K2-19
K2-19 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
K2-19 d Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#287of 570
top 50.2%
This planet
1.04R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | K2-19 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.04 | 11.21 |
| Mass (M⊕) | 1.00 | 6.20 | 317.83 |
| Density (g/cm³) | 5.51 | 31.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 5.69 | 2.53 |
| Insolation (S⊕) | 1.00 | 404.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 6.200 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 281885301
Gaia DR2
Gaia DR2 3798833775141351552
Gaia DR3
Gaia DR3 3798833775141351552
System
K2-19
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.51 Earth days (0.7% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0348 AU.
Transit Fingerprint
Depth
0.019 %
Duration
1.930 h
Impact parameter b
0.170
Rp / R★
0.011650
Transit midpoint (BJD)
2,456,828.9909
Photometric dip
Transit produces a flux drop of 190 ppm lasting ≈ 1.93 h.
Extended Orbital Architecture
Planet / star radius ratio
0.011650
Semi-major axis / stellar radius
9.070
Impact parameter (b)
0.170
RV semi-amplitude (K)
3.100 m/s
Transit mid-time (BJD)
2,456,828.9909
Long. of periastron (ω)
248.00°
Angular separation (arcsec)
0.12000
Eq. Temperature
1,258K
(985 °C)
Insolation (S⊕)
404.00
Earth = 1.00
Earth Similarity (ESI)
0.166
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Dai et al. 2016Instrument
Kepler CCD Array
Publication
2016-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-19
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,350 K — cooler than the Sun (5,778 K)
Estimated Age
1.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.824 R☉
Stellar Mass
0.892 M☉
Metallicity [Fe/H]
0.03
Extended Stellar Properties
Surface gravity (log g)
4.556 dex
Stellar density
1.590 g/cm³
Systemic radial velocity
7.31 km/s
Rotational v·sin i
3.00 km/s
Rotation period
18.36 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
3.423 mas
Total Proper Motion
19.300 mas/yr
PM Right Ascension
-18.79 mas/yr
PM Declination
4.42 mas/yr
Galactic Cartesian (pc)
x = -0.996 · y = 0.088 · z = 0.011
Equatorial (J2000)
RA 174.96025° · Dec 0.60360°
Galactic ℓ, b
267.029° · 58.394°
Ecliptic λ, β
175.131° · -1.448°
HTM-20 index
1093139326
Similar Worlds
Kepler-1578 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.04 R⊕ · 3,470.5 ly
Kepler-1576 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.04 R⊕ · 1,503.3 ly
Kepler-1376 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.05 R⊕ · 2,831.2 ly
Kepler-163 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.05 R⊕ · 2,249.9 ly
Kepler-625 c
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.05 R⊕ · 2,481.1 ly
Kepler-1612 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.03 R⊕ · 2,494.2 ly