Key parameters at a glance
- A radius of 15.82 Earth radii
- A mass of 1,694.03 Earth masses
- Surface gravity around 6.77 g
- An orbital period of 3.141 days
- Semi-major axis 0.0471 AU
- Equilibrium temperature 1,998 K (1725 °C)
- Distance from Earth 4,820.52 light-years
- Earth Similarity Index 0.069
- Travel time at Voyager 1 speed 85,009,873 years
HATS-66 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#173of 1771
top 9.7%
This planet
15.82R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-66 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 15.82 | 11.21 |
| Mass (M⊕) | 1.00 | 1,694.03 | 317.83 |
| Density (g/cm³) | 5.51 | 2.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 6.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,637.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,694.034 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 52689469
Gaia DR2
Gaia DR2 5582647836223843840
Gaia DR3
Gaia DR3 5582647836223843840
System
HATS-66
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.14 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0471 AU.
Transit Fingerprint
Depth
0.543 %
Duration
4.543 h
Impact parameter b
0.283
Rp / R★
0.078700
Transit midpoint (BJD)
2,457,603.0514
Photometric dip
Transit produces a flux drop of 5,433 ppm lasting ≈ 4.54 h.
Extended Orbital Architecture
Planet / star radius ratio
0.078700
Semi-major axis / stellar radius
5.500
Impact parameter (b)
0.283
RV semi-amplitude (K)
586.000 m/s
Transit mid-time (BJD)
2,457,603.0514
Angular separation (arcsec)
0.03190
Eq. Temperature
1,998K
(1725 °C)
Insolation (S⊕)
2,637.00
Earth = 1.00
Earth Similarity (ESI)
0.069
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
Hartman et al. 2019Instrument
Apogee 4K CCD Sensor
Publication
2019-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at HATSouth (12 shown).
Host System: HATS-66
Spectral Class
F-type yellow-white
Effective Temperature
6,626 K — hotter than the Sun (5,778 K)
Estimated Age
2.17 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.841 R☉
Stellar Mass
1.411 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.057 dex
Stellar density
0.318 g/cm³
Systemic radial velocity
39.94 km/s
Rotational v·sin i
12.86 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
0.648 mas
Total Proper Motion
4.224 mas/yr
PM Right Ascension
-3.37 mas/yr
PM Declination
2.55 mas/yr
Galactic Cartesian (pc)
x = -0.164 · y = 0.814 · z = -0.557
Equatorial (J2000)
RA 101.39480° · Dec -33.88169°
Galactic ℓ, b
243.310° · -15.848°
Ecliptic λ, β
107.348° · -56.637°
HTM-20 index
-604960603
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