Key parameters at a glance
- A radius of 11.30 Earth radii
- A mass of 88.04 Earth masses
- Surface gravity around 0.69 g
- An orbital period of 4.009 days
- Semi-major axis 0.0460 AU
- Equilibrium temperature 981 K (708 °C)
- Distance from Earth 659.09 light-years
- Earth Similarity Index 0.128
- Travel time at Voyager 1 speed 11,623,043 years
- Almost certainly tidally locked to its host star given the close orbit
HAT-P-19 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1618of 1771
top 91.3%
This planet
11.30R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HAT-P-19 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.30 | 11.21 |
| Mass (M⊕) | 1.00 | 88.04 | 317.83 |
| Density (g/cm³) | 5.51 | 0.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.69 | 2.53 |
| Insolation (S⊕) | 1.00 | 154.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 88.038 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 267650535
Gaia DR2
Gaia DR2 365426679516816512
Gaia DR3
Gaia DR3 365426679516816512
System
HAT-P-19
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.01 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0460 AU.
Transit Fingerprint
Depth
2.148 %
Duration
2.837 h
Impact parameter b
0.404
Rp / R★
0.134600
Transit midpoint (BJD)
2,456,610.8639
Photometric dip
Transit produces a flux drop of 21,484 ppm lasting ≈ 2.84 h.
Extended Orbital Architecture
Planet / star radius ratio
0.134600
Semi-major axis / stellar radius
12.840
Impact parameter (b)
0.404
RV semi-amplitude (K)
40.900 m/s
Transit mid-time (BJD)
2,456,610.8639
Long. of periastron (ω)
256.00°
Angular separation (arcsec)
0.22800
Eq. Temperature
981K
(708 °C)
Insolation (S⊕)
154.00
Earth = 1.00
Earth Similarity (ESI)
0.128
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
Hartman et al. 2011Instrument
2K CCD Sensor
Publication
2011-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2010 at HATNet (12 shown).
Host System: HAT-P-19
Spectral Class
K-type orange
Effective Temperature
4,962 K — cooler than the Sun (5,778 K)
Estimated Age
7.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.773 R☉
Stellar Mass
0.807 M☉
Metallicity [Fe/H]
0.17
Extended Stellar Properties
Surface gravity (log g)
4.569 dex
Stellar density
2.468 g/cm³
Systemic radial velocity
-20.22 km/s
Rotational v·sin i
0.70 km/s
Rotation period
35.50 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
4.920 mas
Total Proper Motion
42.092 mas/yr
PM Right Ascension
-26.78 mas/yr
PM Declination
-32.48 mas/yr
Galactic Cartesian (pc)
x = 0.811 · y = 0.136 · z = 0.569
Equatorial (J2000)
RA 9.51658° · Dec 34.71140°
Galactic ℓ, b
119.818° · -28.079°
Ecliptic λ, β
23.419° · 27.930°
HTM-20 index
1960655893
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