Key parameters at a glance
- A radius of 11.57 Earth radii
- A mass of 464.03 Earth masses
- Surface gravity around 3.47 g
- An orbital period of 1.732 days
- Semi-major axis 0.0238 AU
- Equilibrium temperature 895 K (622 °C)
- Distance from Earth 976.48 light-years
- Earth Similarity Index 0.182
- Travel time at Voyager 1 speed 17,220,139 years
- Almost certainly tidally locked to its host star given the close orbit
HATS-74 A b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1582of 1771
top 89.3%
This planet
11.57R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | HATS-74 A b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.57 | 11.21 |
| Mass (M⊕) | 1.00 | 464.03 | 317.83 |
| Density (g/cm³) | 5.51 | 1.64 | 1.33 |
| Surface Gravity (g) | 1.00 | 3.47 | 2.53 |
| Insolation (S⊕) | 1.00 | 106.90 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 464.029 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 219189765
Gaia DR2
Gaia DR2 3545653561942122368
Gaia DR3
Gaia DR3 3545653561942122368
System
HATS-74
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.73 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0238 AU.
Transit Fingerprint
Depth
3.636 %
Duration
1.653 h
Impact parameter b
0.406
Rp / R★
0.184400
Transit midpoint (BJD)
2,458,392.0265
Photometric dip
Transit produces a flux drop of 36,359 ppm lasting ≈ 1.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.184400
Semi-major axis / stellar radius
8.900
Impact parameter (b)
0.406
RV semi-amplitude (K)
346.000 m/s
Transit mid-time (BJD)
2,458,392.0265
Angular separation (arcsec)
0.07960
Eq. Temperature
895K
(622 °C)
Insolation (S⊕)
106.90
Earth = 1.00
Earth Similarity (ESI)
0.182
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
Jord Aacute N et al. 2022Instrument
Apogee 4K CCD Sensor
Publication
2022-03
Observation locale
Ground
Discovery cohort
Planets confirmed in 2021 at HATSouth (3 shown).
Host System: HATS-74 A
Spectral Class
K-type orange
Effective Temperature
3,777 K — cooler than the Sun (5,778 K)
Estimated Age
11.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.576 R☉
Stellar Mass
0.601 M☉
Metallicity [Fe/H]
0.51
Extended Stellar Properties
Surface gravity (log g)
4.696 dex
Stellar density
4.430 g/cm³
Systemic radial velocity
15.85 km/s
Rotation period
4.75 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
3.314 mas
Total Proper Motion
55.537 mas/yr
PM Right Ascension
-38.86 mas/yr
PM Declination
39.68 mas/yr
Galactic Cartesian (pc)
x = -0.931 · y = 0.147 · z = -0.335
Equatorial (J2000)
RA 171.01479° · Dec -19.55696°
Galactic ℓ, b
276.219° · 38.740°
Ecliptic λ, β
179.881° · -21.448°
HTM-20 index
-358014710
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